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57ed2c4b42fd49fd8f9a0c58ed6af2c21f036ca2
subsection
38
47
Results
Inserting these expression into Eq (REF ) for a quick, qualitative estimate, we find \bar{T}_g\sim {v_{ij}v_{ij}}\equiv v_s^2 for \gamma _0\gg \gamma _1\bar{T}_g, and \bar{T}_g\sim v_s for \gamma _0\ll \gamma _1\bar{T}_g. The first regime is essentially elastic, because the relaxation term, u_{ij}/\tau \sim u_{ij}\bar{...
{ "cite_spans": [] }
10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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557e0760d12577971b54542a6a8b2f10716f3e61
subsection
39
47
The Hypoplastic Regime
Hypoplasticity , a modern, well-verified, yet comparatively simple theory of soil mechanics, models solid dynamics as realistically as the best of the elasto-plastic theories. Its starting point is the rate-independent constitutive relation,\partial _t{\sigma }_{ij} =H_{ijk\ell }\,\,v_{k\ell }+\Lambda _{ij}\sqrt{v^0_{i...
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10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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f1048115fbfb0f430f6e4eb4d582f5359f482495
subsection
40
47
The Hypoplastic Regime
(Rate-independence means \partial _t{\sigma }_{ij} is linearly proportional to the magnitude of the velocity, such that the change in stress remains the same for given displacement irrespective how fast the change is applied, a well verified observation in both the elastic and hypoplastic regime.) Great efforts are inv...
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10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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ca7d56f5f9e411cd5f25cc824a51d8b064331960
subsection
41
47
The Hypoplastic Regime
It is then quite easy to evaluate \partial _t \sigma _{ij} employing Eqs (,),{\partial _t}\sigma _{ij}=(1-\alpha ){\partial _t} \pi _{ij}=(1-\alpha )M_{ijk\ell } {\partial _t} u_{k\ell }=\\ {\textstyle (1-\alpha ) M_{ijk\ell } [(1-\alpha )v_{k\ell }- u^0_{k\ell }/\tau -\delta _{k\ell }u_{mm}/{\tau _1}]}.Clearly, given ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 894, "openalex_id": "", "raw": "D.O. Krimer, M. Pfitzner, K. Bräuer, Y. Jiang, M. Liu, Granular Elasticity: General Considerations and the Stress Dip in Sand Piles, Phys. Rev. E74, 061310 (2006).", "source_ref_id": "d44bb7ac...
10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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8d9c445974ac6b5550d5ea5140fff0c63a20a888
subsection
42
47
The Hypoplastic Regime
But |\Lambda _{ij}|/ |H_{ijk\ell }| \sim |u_{k\ell }^0|\cdot 114/(1-\alpha ) is of order unity for |u_{ij}| around 10^{-3}.Although the functions of Eqs (REF ,) appear rather different from that of Eqs (REF ,), the stress-strain increments are quite similar, as the comparison in  shows. Moreover, the residual discrepan...
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10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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20789535f512183bb0e3cdf789cb57a8ae423cac
subsection
43
47
Conclusion
The success of Granular Elasticity, the theory we employ to account for static stress distribution in granular media, is mainly due to the fact that the information on the plastic strain is quite irrelevant there. This is no longer true in granular dynamics, when the system is being deformed – sheared, compressed or ta...
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10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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db1aaecacbe437ab5a6d8a56d5c18105f9ca4422
subsection
44
47
Equilibrium Conditions
First, noting \pi _{ij}{\rm d}u_{ij}=\pi _{ij}{\rm d}\nabla _jU_i because \pi _{ij} is symmetric, we write the energy density per unit volume (dropping the subscript of w_0 in this section) as{\rm d}w=T{\rm d}s+\mu {\rm d}\rho -\pi _{ij}{\rm d}\nabla _jU_i.Next, we vary the energy \int w{\rm d}V for given entropy \int ...
{ "cite_spans": [] }
10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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e4d6fdfd305dd08ed7be2a5adad7bd47ab5dbecb
subsection
45
47
Equilibrium Conditions
Since \nabla _j\pi _{ij}\sim \partial ^2_x[U_x(x_0)-U_x(0)]=0, the one-dimensional strain is u_{\ell \ell }=\partial _x U_x=(U_x(x_0)-U_x(0))/x_0 and cannot change.To find the proper expression, we may take mass M rather than volume V as the constant quantity, and vary the density by changing the volume, or the length ...
{ "cite_spans": [] }
10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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dd9f18b978692ac9ff079be98386e247db275769
subsection
46
47
Equilibrium Conditions
But if Eq (REF ) is implemented, turning Eq (REF ) to{\rm d}e&=&T{\rm d}\sigma -(P_T+\pi _{\ell \ell }/3){\rm d}v-(\pi ^0_{ij}/\rho ){\rm d}\nabla _jU_i,\\ &=& T{\rm d}\sigma -\rho ^{-1}(P_T\,\delta _{ij}+\pi _{ij})\,{\rm d}\nabla _jU_i,the equilibrium conditions are altered to become\nabla _iT=0,\quad \nabla _i(P_T+\p...
{ "cite_spans": [] }
10.1007/s10035-009-0137-3
0807.1883
Granular Solid Hydrodynamics
[ "Yimin Jiang", "Mario Liu" ]
[ "cond-mat.soft" ]
2,008
en
Physics
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821daa999db777d6df41a7eb8dd16a07b0983792
abstract
0
14
Abstract
Atomic hydrogen escaping from the extrasolar giant planet HD209458b provides the largest observational signature ever detected for an extrasolar planet atmosphere. In fact, the upper atmosphere of this planet is evaporating. Observational evidences and interpretations coming from various models are reviewed. Implicatio...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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c2896eec39f3f88321be93f0d0e99be0055136fe
subsection
1
14
Introduction
Extrasolar planets are now commonly found around main sequence stars, usually by measuring the variations of the stellar velocity projected on the line of sight. If the inclination of the planetary system is close to 90^{\rm o}, the planet is seen from Earth passing in front of its host star: this transiting event is t...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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f6bb20576e6beaf9669ea12807844d4f770322e9
subsection
2
14
Exosphere and atmospheric escape: some definitions
All the notions addressed in this chapter are developed by Chamberlain & Hunten (1987), where the reader is referred for more details.
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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00ae6bd07d539c544cf73d2694adaca0f66c4d07
subsection
3
14
Collisionless atmospheres
A planetary atmosphere can be roughly split in two parts: the bottom part is the homosphere, where atmospheric constituants are mixed by various processes (convection in the troposphere, eddy diffusion, molecular diffusion, collisions, etc.) resulting in a more-or-less uniform composition with a mean molar mass \mu . O...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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94883ad580e6d5cc09197ec1fa6459481a5fca26
subsection
4
14
Escape processes
Being a boundary layer between a relatively dense gas envelope and space vacuum, the exosphere is where atmospheric mass loss processes, or escape processes, take place. The simplest, yet usually not very efficient, escape mechanism is the thermal escape (Jeans 1925). It assumes that particles in the exosphere have a M...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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b60ccff4ae80f02fbbc3a6f5fbd9978ab899ff67
subsection
5
14
Escape processes
At this point, the best description of atmospheric escape is not that of Jeans, nor the limit to the escape flux is the transport to the exobase; the description is rather hydrodynamic and the energetic input to the upper atmosphere represents the bottleneck to the escape flux.Furthermore, close-in giant extrasolar pla...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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69d592b7e7f3d704f23a464361f2ab1e39c53df4
subsection
6
14
Roche lobe
The gravitational potential of a rotating circularized binary system, such as a star-planet system, expresses (Hameury 2000)\phi = -\frac{\mathrm {G}m_p}{|x-r_p|} - \frac{\mathrm {G}m_\star }{|x-r_\star |} - \frac{1}{2} |\omega \times x|^2,where x is the distance from the centre of mass and \omega is the system angular...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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663b1d90c8e71bc7b720febfec170cbe478c875a
subsection
7
14
Detection of the escaping exosphere of HD 209458b from resolved data
The transit of HD 209458b was originally observed by Vidal-Madjar (2003) with the Space Telescope Imaging Spectrograph (STIS; Woodgate 1998) on board the Hubble Space Telescope (HST) to search for H i in the planet atmosphere. Since H i is the lightest possible component of the planet, it could be detected high in the ...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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45550570965c40668c292d38f817a5cc8445913f
subsection
8
14
Constraints on the evaporation of HD 209458b from unresolved data
The detection of HD 209458b extended exosphere was first confirmed by Vidal-Madjar (2004) with low-resolution STIS spectra gathered during 4 transits of the planet. A low-resolution grism was employed to probe a large spectral domain in the ultraviolet (from 120 to 170 nm) and test whether other atomic elements could b...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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c89890aa00c7796293e8cf4c1bc05352d7a03d05
subsection
9
14
Are there other cases of evaporation?
The atmospheric evaporation phenomenon was first observed in 2003 when the number of transiting planets around bright stars (V\lesssim 10) was minute. The situation drastically changed in 2004, when several `bright' transits were spotted, in particular, HD 149026b (V = 8.15; Sato 2005) and HD 189733b (V = 7.67; Bouchy ...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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b85981f4053be40459dde027808ed24f163440e3
subsection
10
14
Interpreting the observations
Models of extended exospheres have early been crafted by observers to justify the search for large spectroscopic signatures (Rauer 2000; Moutou 2001) and, later, to provide an interpretation of the 15\% absorption in the Ly\alpha stellar line during the transit (Vidal-Madjar 2003). These last authors used a particle si...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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c8ec873397cb753c2da76a3928ef11fd5483c0a2
subsection
11
14
Understanding the dynamics of an evaporating atmosphere
Numerical models of atmospheres enduring hydrodynamic escape were initially built to explain the loss of hydrogen from the primitive terrestrial and cytherean atmospheres (Watson, Donahue & Walker 1981; Kasting & Pollack 1983; Chassefière 1996). The discovery of HD 209458b evaporation sparked new modelling insights, wh...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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f8dbe49213bc77c7351684bce292669e50ae9908
subsection
12
14
Atmospheric evaporation in the frame of comparative exoplanetology
Although a lot of detailed models has been developed to understand the physics of evaporation, it appears that the resulting escape rate does not depend on the details of the models but only on the assumed input energy used to escape the potential well of the planet. As a consequence, an energy diagram was introduced b...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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07a7f180ab6fb17006997ec0a8c5f0a3d3e94183
subsection
13
14
Summary
A planetary transit in the ultraviolet produces remarkably large spectroscopic signatures compared to what is observed in the visible. So far, the observational results obtained on planet HD 209458b have been obtained from two different instruments and strengthened by independent data analysis. The evaporation of close...
{ "cite_spans": [] }
0807.1885
Evaporation of extrasolar planets
[ "David Ehrenreich" ]
[ "astro-ph" ]
2,008
en
Physics
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79831928cc21532873eb2014dd040627452a972a
abstract
0
7
Abstract
Cold Fermionic atoms with three different hyperfine states confined in optical lattices show pronounced Atomic Density Waves (ADWs). These ADWs are pinned due to the confining potential that traps the atoms in the optical lattice and can be considered a crystal of strongly bound trions. We show that the crystalline pha...
{ "cite_spans": [] }
10.1103/PhysRevA.80.013616
0807.1886
Crystallization of trions in SU(3) cold atom gases trapped in optical lattices
[ "Rafael A. Molina", "Jorge Dukelsky", "Peter Schmitteckert" ]
[ "cond-mat.str-el", "cond-mat.mes-hall" ]
2,008
en
Physics
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2a19af0d910c471da035f703a237c3a20dd8887d
subsection
1
7
Body
Crystallization of trions in SU(3) cold atom gases trapped in optical latticesRafael A. Molina^{1,2} Jorge Dukelsky^1 Peter Schmitteckert^{3}^1Instituto de Estructura de la Materia - CSIC, Serrano 123, 28006 Madrid, Spain^2Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany^3...
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10.1103/PhysRevA.80.013616
0807.1886
Crystallization of trions in SU(3) cold atom gases trapped in optical lattices
[ "Rafael A. Molina", "Jorge Dukelsky", "Peter Schmitteckert" ]
[ "cond-mat.str-el", "cond-mat.mes-hall" ]
2,008
en
Physics
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b6bbd432a1c32fa7c1ab213cb691b3f596b0aaf4
subsection
2
7
Body
There is a competition between the superfluid trionic behavior and ADW order with the former phase dominating for generic fillings, and the latter probably appearing at half-filling.The main goal of this letter is to study the emergence of a trionic crystalline phase in three color atoms loaded in optical lattices. We ...
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10.1103/PhysRevA.80.013616
0807.1886
Crystallization of trions in SU(3) cold atom gases trapped in optical lattices
[ "Rafael A. Molina", "Jorge Dukelsky", "Peter Schmitteckert" ]
[ "cond-mat.str-el", "cond-mat.mes-hall" ]
2,008
en
Physics
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2ba0f6c0e1b2ab636eff277247f2c193bae25016
subsection
3
7
Body
For the number of pairs we defineIn the non-polarized we will be interested in the total number of pairs at each site i,The local correlation that counts the number of trions isFor non-interacting SU(3) fermions P_{i\alpha \beta }=\left< n_{i\alpha }\right> \left< n_{i\beta }\right>-\left< n_{ir} \right> \left< n_{ig} ...
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10.1103/PhysRevA.80.013616
0807.1886
Crystallization of trions in SU(3) cold atom gases trapped in optical lattices
[ "Rafael A. Molina", "Jorge Dukelsky", "Peter Schmitteckert" ]
[ "cond-mat.str-el", "cond-mat.mes-hall" ]
2,008
en
Physics
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d285f141929c4f9559d2f7ac5591e90eedcf22b1
subsection
4
7
Body
Unlike the SU(2) case, the first contribution to hopping appears in the third order of perturbations, thus a CPT will always dominate for strong enough attraction.Adding the effect of the trap we have calculated the energy of the CPT state, defined as \prod _{i^{\prime }}c^{\dagger }_{i^{\prime },r} c^{\dagger }_{i^{\p...
{ "cite_spans": [] }
10.1103/PhysRevA.80.013616
0807.1886
Crystallization of trions in SU(3) cold atom gases trapped in optical lattices
[ "Rafael A. Molina", "Jorge Dukelsky", "Peter Schmitteckert" ]
[ "cond-mat.str-el", "cond-mat.mes-hall" ]
2,008
en
Physics
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88ad2fb676d34db46b65e19b2e001a3e1d1991a1
subsection
5
7
Body
The crossover from the CPT to the BI as we increase the confinement consists on a number of steps in which each of the trions in the CPTs in the outer side of the cloud is forced to move the BI in the center (an analogous phenomenom has been recently described for spin 3/2 atoms ). [Figure: (Color online) Normalized si...
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10.1103/PhysRevA.80.013616
0807.1886
Crystallization of trions in SU(3) cold atom gases trapped in optical lattices
[ "Rafael A. Molina", "Jorge Dukelsky", "Peter Schmitteckert" ]
[ "cond-mat.str-el", "cond-mat.mes-hall" ]
2,008
en
Physics
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c74847eee58d61a3e508ce9295fa48c268833ca2
subsection
6
7
Body
FIS2006-12783-C03-01 and by grant CAM-CSIC No. CCG07-CSIC/ESP-1962. RAM contract is financed by CSIC and the European Comission through the I3p program and by a Jose Castillejo Grant of the Spanish Ministry of Research.
{ "cite_spans": [] }
10.1103/PhysRevA.80.013616
0807.1886
Crystallization of trions in SU(3) cold atom gases trapped in optical lattices
[ "Rafael A. Molina", "Jorge Dukelsky", "Peter Schmitteckert" ]
[ "cond-mat.str-el", "cond-mat.mes-hall" ]
2,008
en
Physics
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e7245302a2c816599f4fe96a16d950a9d98c2bee
abstract
0
9
Abstract
We introduce a minimal Agent Based Model with two classes of agents, fundamentalists (stabilizing) and chartists (destabilizing) and we focus on the essential features which can generate the stylized facts. This leads to a detailed understanding of the origin of fat tails and volatility clustering and we propose a mech...
{ "cite_spans": [] }
0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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7303ee5c189d76936b16732fb769b23b5733f1fb
subsection
1
9
Introduction
The Random Walk (RW) represents the simplest modelization for the behavior of financial time series. It was in fact introduced by Louis Bachelier  in 1900 to model the dynamics of prices. Recently, the availability of large amounts of data has been accompanied by a systematic study of the empirical properties of price ...
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0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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9b90dc547a9eaff0eb5b4d200da394ac97accf29
subsection
2
9
Introduction
Finally we would like to stress that the general perspective of the present model is to have the maximum simplification in order to identify the specific origin of the SF. The model can be easily generalized to higher degrees of realism in systematic way .
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0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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86884e43c34c1a6a378462cd195824ae73ac2957
subsection
3
9
Simplest Agent Based Model with Fundamentalists and Chartists
We consider N agents divided in N_f fundamentalists and N_c chartists (N=N_f+N_c). For the moment we keep N fixed but later, in the study of self-organization, N will be a fluctuating variable. An important point is to have a description of chartists as simple as possible and with the minimal number of parameters. In t...
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0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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0c52b39d19b3a06e87832cf55e6ed41e5e070885
subsection
4
9
Simplest Agent Based Model with Fundamentalists and Chartists
It is clear therefore that the intermittent region corresponds to finite size effects which disappear for N very large.]For small price fluctuations the use of linear or log returns are essentially equivalent and in this paper we prefer the linear description because it permits an analytical treatment of various proper...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 481, "openalex_id": "", "raw": "A. Kirman, Ants, Rationality and Recruitment, The Quarterly Journal of Economics 108 137-156 (1993).", "source_ref_id": "6ed0730677a82c9726fdf533c54b82390459a985", "start": 326 }, ...
0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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35fd4fc0dbd23316edcd9a097c6add83bf8652eb
subsection
5
9
Simplest Agent Based Model with Fundamentalists and Chartists
This means that specific effects in the real data and in the model can affect their values, which should not be considered as fundamental test for the models. In Fig. REF we report the Stylized Facts corresponding to the intermittent case (N=500). The fat tails are clearly present and so is the volatility clustering. I...
{ "cite_spans": [] }
0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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d88250316c8561e3d153642bdbd36a31e321aa79
subsection
6
9
Nonstationarity and the Microscopic Origin of Stylized Facts
The simplicity of the model permits a detailed interpretation of the origin and nature of the stylized facts. The long time correlation of volatility and its behavior in terms of bursts depends essentially on two elements. The first is that there is a certain probability to have an appreciable number of chartists and t...
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0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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b2058253f043012cc335e2ee8d202c9a21eea1bb
subsection
7
9
Self-Organization of Stylized Facts
Finally we can consider the problem of the self-organization of the system in the intermittent state. In fact, also in our model, the SF are obtained only for specific values of the parameters and a basic question is to understand why the systems chooses to stabilize in this special situation. The key point in this res...
{ "cite_spans": [] }
0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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f18bf9f0f4b8034d73623c1d3c3487b7a5e37064
subsection
8
9
Conclusions
In summary the model we have introduced was motivated by the objective of having the maximum mathematical simplification that is still able to reproduce the stylized facts. This has permitted a detailed interpretation of their nature and origin of SF and it is a crucial point in order to consider the phenomenon of the ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 971, "openalex_id": "", "raw": "P. Bak, How Nature Works: The Science of Self-Organised Criticality New York, Copernicus Press, (1996).", "source_ref_id": "c6e70b1003e748fba8b6cc58b73de85f8a201f0e", "start": 814 } ...
0807.1888
Minimal Agent Based Model For The Origin And Self-Organization Of Stylized Facts In Financial Markets
[ "V. Alfi", "L. Pietronero", "A. Zaccaria" ]
[ "q-fin.TR", "cond-mat.stat-mech", "physics.soc-ph" ]
2,008
en
Quantitative Finance
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280a1374d60ca743d5b9450e26f126cf083bd1ea
abstract
0
114
Abstract
We review, in a self-contained and pedagogical manner, recent developments and techniques for the evaluation of the scattering amplitudes of planar N=4 SYM theory at both weak and strong coupling. Special emphasis is placed on the newly discovered connection between a special class of amplitudes and the expectation val...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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efc3e644a3fd87a3097baf2b6191a20b31c01d4c
subsection
1
114
Introduction
There are two approaches to understanding and solving {\cal N}=4 Yang-Mills (SYM): on the one hand, being a conformal field theory, it is uniquely specified by the spectrum of (anomalous) dimensions of gauge-invariant operators and their three-point correlation functions, while, on the other hand, like any other quantu...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1079, "openalex_id": "", "raw": "N. Beisert and M. Staudacher, “Long-range PSU(2,2|4) Bethe ansaetze for gauge theory and strings,” Nucl. Phys. B 727, 1 (2005) [arXiv:hep-th/0504190].", "source_ref_id": "2909eab541fec559bee6...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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1f435c3bbf1047850f3cee5f266c0cd93266e4f3
subsection
2
114
Introduction
The four- and five-gluon amplitudes, which are currently known to all orders in perturbation theory (up to a set of undetermined constants), provide a proof of principle in this direction.Here we review, in a self-contained and pedagogical manner, some of the recent developments and techniques for the evaluation of the...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 471, "openalex_id": "", "raw": "L. J. Dixon, “Gluon scattering in N=4 super-Yang-Mills theory from weak to strong coupling,” arXiv:0803.2475 [hep-th].", "source_ref_id": "f349ebb8ffc4817f519c121f4dcac69625e5439a", "sta...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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9045a546e852fba9e2f87c868136c341aa6c3937
subsection
3
114
Introduction
While not yet clear how to extend the calculations beyond leading order, this regularization scheme has the advantage of being analogous to dimensional regularization as used in gauge theory calculations and thus of allowing a direct comparison of results.We carry out the calculation of the four-gluon scattering amplit...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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975c85600453eb38e15e7a8ac8b93c796bc8ff33
subsection
4
114
Introduction
Its origins and full implications remain to be uncovered; in section we collect some open questions whose answers may lead to an improved understanding of the deep and powerful structures governing the dynamics of {\cal N}=4 super-Yang-Mills theory and perhaps other four-dimensional gauge theories.
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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638ccdc0b89402e40c8853e5aa46e0a5daabfe1e
subsection
5
114
Scattering amplitudes at weak coupling
On-shell scattering amplitudes are perhaps the most basic quantities computed in any quantum field theory. The standard textbook approaches proceed to relate them through the LSZ reduction to Green's functions which are in turn computed in terms of Feynman diagrams. Each diagram evaluated separately is typically more c...
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10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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571dc8b1b038dddacb09b81b8e9d5e6954f5fe09
subsection
6
114
Organization, presentation and general properties
A good notation as well as an efficient organization of the calculation and result are indispensable ingredients for the calculation of scattering amplitudes, whether with Feynman diagrams or by other means. They are provided, respectively, by the spinor helicity method (for massless theories) and by color ordering, wh...
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10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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ab305fedb4e32e4a2cc2627f35f19a86c320473e
subsection
7
114
Spinor helicity and color ordering
In a massless theory, solutions of the chiral Dirac equation provide an excellent parametrization of momenta and polarization vectors which allows, among other things, the construction of physical polarization vectors without fixing noncovariant gauges. The main observation is that the sum over polarizations of a direc...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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162516971379a679b80694d9958800e436bc1fd8
subsection
8
114
Spinor helicity and color ordering
Moreover, in the frame in which the vector field propagates along a specified axis, they should take the standard form of circular polarization vectors.A solution to these constraints can be constructed in terms of an arbitrary null (reference) vector \xi (\xi _\mu \sigma ^\mu _{\alpha {\dot{\alpha }}}=\xi _\alpha {\t...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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43c7da5964c8a70cb296bf76646cecd57530a292
subsection
9
114
Spinor helicity and color ordering
For an SU(N) gauge theory with gauge group generators denoted by T^a, it is possible to show that any L-loop amplitude may be decomposed as follows:A^{(L)}=N^L\sum _{\rho \in S_n/\mathbb {Z}_n} {\rm Tr}[T^{a_{\rho (1)}}\dots T^{a_{\rho (n)}}]A^{(L)}(k_{\rho (1)}\dots k_{\rho (n)},N) +{\rm multi{\scriptstyle -}traces}wh...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1408, "openalex_id": "", "raw": "Z. Bern and D. A. Kosower, “Color Decomposition Of One Loop Amplitudes In Gauge Theories,” Nucl. Phys. B 362, 389 (1991).", "source_ref_id": "1f4d8f8be70f30953221902557a67d5addf4b249", ...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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[ 0.184326171875, 0.006622314453125, 0.1380615234375, 0.168212890625, 0.042877197265625, 0.184326171875, 0.1201171875, 0.160400390625, 0.0194854736328125, 0.007049560546875, 0.02215576171875, 0.071044921875, 0.0806884765625, 0.071533203125, 0.0750732421875, 0.048553466796875, 0.1660156...
78a21aa612fa812f280cb4714ae47b28d371115c
subsection
10
114
General properties of color ordered amplitudes
The general properties of color-ordered amplitudes follow from their construction in terms of Feynman diagrams (or string diagrams). The results of other constructions must obey the same properties. Some of them – such as the analytic structure – impose powerful constraints and in some cases uniquely determine the (tre...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 818, "openalex_id": "", "raw": "M. L. Mangano, S. J. Parke and Z. Xu, “Duality And Multi-Gluon Scattering,” Nucl. Phys. B 298, 653 (1988).", "source_ref_id": "98de2b25d61bb7a9a2d78c89860a581a357cd043", "start": 341 ...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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e9e8b2680cfc3400d132355ce68b682cee13c10f
subsection
11
114
General properties of color ordered amplitudes
For a given gauge theory, the l-loop splitting amplitudes {\rm Split}^{(l)}_{-h}((n-1)^{h_{n-1}},n^{h_n}) are universal functions of the helicities of the collinear particles, the helicity of the external leg of the resulting amplitude and of the momentum fraction z defined as z=\frac{\xi \cdot k_{n-1}}{\xi \cdot (k_{...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 333, "openalex_id": "", "raw": "D. A. Kosower, “All-order collinear behavior in gauge theories,” Nucl. Phys. B 552, 319 (1999) [arXiv:hep-ph/9901201].", "source_ref_id": "7a8dd3a804fe83becc08bc4912c9a90304dfe739", "sta...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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af7ae187961be3c4d439588590d2e1bb343c4579
subsection
12
114
General properties of color ordered amplitudes
\longrightarrow \\ \sum _{h_p = \pm }\Big [ \!\!\!\!\!\!\!\!\!\!\!\!\! && A^{\rm tree}_{m+1}(1,\ldots ,m,k^{h_k}) \frac{i}{k_{1,m}^2} A^{\rm 1\,loop}_{n-m+1}((-k)^{-h_k},m+1,\ldots ,n) \cr &+&\!\!\!A^{\rm 1\,loop}_{m+1}(1,\ldots ,m,k^{h_k}) \frac{i}{k_{1,m}^2} A^{\rm tree}_{n-m+1}((-k)^{-{h_k}},m+1,\ldots ,n) \vphantom...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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970bf832e6287ab8ca9384b5e09866d1afa72136
subsection
13
114
Some simple examples
Besides color ordering, scattering amplitudes can be organized following the number of negative helicity gluons. One can easily see that the amplitude with only positive helicity gluons as well as the amplitude with a single negative helicity gluons vanish identically at tree level in any gauge theory. This is realized...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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dcedc14b1153c25e82f50e6d059df8d6b92d8151
subsection
14
114
Some simple examples
Similarly, using the vanishing of \langle 0|\lambda ^{a+} g^- g^+\dots g^+|0\rangle and making judicious choices for the reference spinor leads to the vanishing of the amplitude with a single negative helicity gluon To spell out the details, we use an {\cal N}=1 part of the {\cal N}=4 supersymmetry algebra and denote b...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 970, "openalex_id": "", "raw": "M. T. Grisaru and H. N. Pendleton, “Some Properties Of Scattering Amplitudes In Supersymmetric Theories,” Nucl. Phys. B 124 (1977) 81.", "source_ref_id": "f4e6355ec2b9168d02779d9f352cb0dea34ff...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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[ 0.057281494140625, 0.0163726806640625, 0.08807373046875, 0.1285400390625, 0.0899658203125, 0.0986328125, 0.0163116455078125, 0.1436767578125, 0.0914306640625, 0.1307373046875, 0.158447265625, 0.1097412109375, 0.059478759765625, 0.1361083984375, 0.0165863037109375, 0.08050537109375, 0...
7a1a40501fa7ee25787a298c5a53eaa06ef5d766
subsection
15
114
Some simple examples
It thus follows that, to any loop order L,A_{MHV}^{(L)}=A^{\rm tree}_{MHV}\,{\cal M}^{(L)}(s_{i,i+1}, s_{i\dots i+2},\dots )~~,where {\cal M}^{(L)}(s_{i,i+1}, s_{i\dots i+2},\dots ) is a cyclicly symmetric function of momenta and s_{i...j}=(k_i+k_{i+1}+...+k_j)^2. This factorization of the tree-level amplitude also hol...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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44b3aba67f7ebffc374575c44f0f0b9f035acf73
subsection
16
114
Soft/Collinear factorization
A general feature of massless gauge theories in four dimensions is the existence of infrared singularities.Ultraviolet divergences may of course be present as well; as previously mentioned, our focus is {\cal N}=4 SYM theory, which is free of such divergences. Unlike ultraviolet divergences they cannot be renormalized ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 529, "openalex_id": "", "raw": "R. Akhoury, “Mass Divergences Of Wide Angle Scattering Amplitudes,” Phys. Rev. D 19, 1250 (1979);", "source_ref_id": "e12f1d0a1963ddd80080f1d2d208329ef6e09a9a", "start": 434 }, {...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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f9c87f997dc041fcb065a45c71e3092f7f761ab7
subsection
17
114
Soft/Collinear factorization
Finally, h_n(k, \frac{Q}{\mu },\alpha _s(\mu ),\epsilon ) contains the effects of highly virtual fields and is finite as \epsilon \rightarrow 0. The jet and soft functions can be independently defined in terms of specific matrix elements.The factorization scale Q is arbitrary (within some physical limits); it is simply...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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4fb8d3fc7e283160d11c55394b671bd79dfc22b4
subsection
18
114
Soft/Collinear factorization
They read\frac{d}{d\ln Q^2}{\cal M}^{[gg\rightarrow 1]}{\left( \frac{Q^2}{\mu ^2},\lambda ,\epsilon \right)}=\frac{1}{2}\left[K(\epsilon , \lambda )+G\left(\frac{Q^2}{\mu ^2},\lambda ,\epsilon \right)\right] {\cal M}^{[gg\rightarrow 1]}{\left( \frac{Q^2}{\mu ^2},\lambda ,\epsilon \right)}~,~~where the function K contai...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 620, "openalex_id": "", "raw": "A. H. Mueller, “On The Asymptotic Behavior Of The Sudakov Form-Factor,” Phys. Rev. D 20, 2037 (1979);", "source_ref_id": "fd79d58c6aa376efb3231960a80f97fa4e253372", "start": 359 }, ...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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e2cc798b6a7b09ab71b2f7f15489c5de3fd3833e
subsection
19
114
Soft/Collinear factorization
The solution for K and G may then be used to reconstruct the Sudakov form factor (REF ) which, in turn, leads to the following expression for the factorized amplitude :{\cal M}_n&=& \exp \left[-\frac{1}{8}\sum _{l=1}^\infty a^l \left(\frac{\gamma _K^{(l)}}{(l\epsilon )^2} +\frac{2{\cal G}_0^{(l)}}{l\epsilon }\right)\su...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 567, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon and V. A. Smirnov, “Iteration of planar amplitudes in maximally supersymmetric Yang-Mills theory at three loops and beyond,” Phys. Rev. D 72, 085001 (2005) [arXiv:hep-th/0505205...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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c32d2d6ca725a276e1db5871e024e9c246fd874b
subsection
20
114
Soft/Collinear factorization
The leading term in the strong coupling expansion of G was computed in :f(\lambda )&=&\frac{\sqrt{\lambda }}{\pi }\left(1-\frac{3\ln 2}{\sqrt{\lambda }}-\frac{\rm K}{\lambda }+\cdots \right) \,, \hspace{28.45274pt}\lambda \rightarrow \infty \,,\\ G(\lambda )&=& (1 - \ln 2) { \sqrt{\lambda } \over 8\pi } + \cdots \,, \h...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 465, "openalex_id": "", "raw": "L. F. Alday and J. M. Maldacena, “Gluon scattering amplitudes at strong coupling,” JHEP 0706, 064 (2007) [arXiv:0705.0303 [hep-th]].", "source_ref_id": "d6cbe432fa71a63c9bfec171d91c197adf561ce...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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d2394161628d2fb56e0a988d2d644d32108c16b1
subsection
21
114
Loop amplitudes; generalized unitarity-based method
Having discussed general properties of scattering amplitudes, we now proceed to describe methods for their construction at loop level. The goal will be to use only on-shell information for this purpose. we will be assuming (quite accurately) that tree-level amplitudes are known. As we will see, the fact that Feynman di...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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d7d8a476b4f589f263b82625570591d98241f4eb
subsection
22
114
Loop amplitudes; generalized unitarity-based method
The first string scattering amplitudes at one-loop were evaluated through such a method , .While perfectly valid, such an approach does not make use of recent sophisticated techniques for evaluating Feynman integrals: identities, modern reduction techniques, differential equations, reduction to master integrals, etc. A...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 91, "openalex_id": "", "raw": "K. Kikkawa, B. Sakita and M. A. Virasoro, “Feynman-like diagrams compatible with duality. I: Planar diagrams,” Phys. Rev. 184, 1701 (1969).", "source_ref_id": "02177e998ae89fa70a5bca69b5ce92d5e...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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c90a68b6c948b04bfaabc10eee7d8fb9a4c283c0
subsection
23
114
Loop amplitudes; generalized unitarity-based method
We will organize the calculation in terms of regular, two-particle cuts reinterpreted in the spirit of generalized unitarity-based method. There are two cuts – in the s and in the t-channels. Depending upon the external helicity configuration either one or both cuts are of non-singlet type, with the complete {\cal N}=4...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2228, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. C. Dunbar and D. A. Kosower, “One loop n point gauge theory amplitudes, unitarity and collinear limits,” Nucl. Phys. B 425, 217 (1994) [arXiv:hep-ph/9403226].", "sour...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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d7a1cf9fc6450cb7f22870f855971a89683f0d74
subsection
24
114
Loop amplitudes; generalized unitarity-based method
It was shown in that in a supersymmetric theory this rational contributions are absent and that in such theories one-loop amplitudes are constructible using four-dimensional cuts. [Figure: Box,triangle and bubble scalar integrals. The clusters at each cornerare constructed from color-adjacent external legs. If more tha...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 180, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. C. Dunbar and D. A. Kosower, “One loop n point gauge theory amplitudes, unitarity and collinear limits,” Nucl. Phys. B 425, 217 (1994) [arXiv:hep-ph/9403226].", "sourc...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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351f7d4c42b28c9f5aaa4147d068ab7cc1425ffd
subsection
25
114
Loop amplitudes; generalized unitarity-based method
For an arbitrary number of external legs (larger than four), the result initially obtained in (which can be reproduced using quadruple cuts and complex momenta) reads:{\cal M}_{n=2m+1}^{(1)}&=&-\frac{1}{2}\sum _{r=2}^{m-1}\sum _{i=1}^n (t_{i-1}^{[r+1]}t_i^{[r+1]}-t_{i}^{[r]}t_{i+r+1}^{[n-r-2]})\;I_{4;r;i}^{2me} -\frac...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 918, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. C. Dunbar and D. A. Kosower, “One loop n point gauge theory amplitudes, unitarity and collinear limits,” Nucl. Phys. B 425, 217 (1994) [arXiv:hep-ph/9403226].", "sourc...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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aabbf6d82b2b9aa0ae5949c9870b2f67d0357e18
subsection
26
114
Calculations at higher loops
Higher loop calculations in {\cal N}=4 SYM enjoy similar simplifications, though to a lesser extent. An analog of the 1-loop integral basis is not available, in the sense that the members of all proposed bases are in fact functionally dependent integrals Notable examples are the two-loop four-point integral basis with ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 567, "openalex_id": "", "raw": "V. A. Smirnov and O. L. Veretin, “Analytical results for dimensionally regularized massless on-shell double boxes with arbitrary indices and numerators,” Nucl. Phys. B 566, 469 (2000) [arXiv:hep-ph/...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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ee2bc8835818695184733a47438234de39c30e43
subsection
27
114
Calculations at higher loops
This rule is illustrated in figure REF . [Figure: The rung rule.]For higher multiplicity amplitudes the rung rule is less effective and it is necessary to explicitly evaluate the relevant iterated cuts. The strategy discussed in this section can be used to compute quite high loop amplitudes in {\cal N}=4 SYM. In the ne...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1499, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. C. Dunbar and D. A. Kosower, “One-loop self-dual and N = 4 superYang-Mills,” Phys. Lett. B 394, 105 (1997) [arXiv:hep-th/9611127].", "source_ref_id": "9aee4d610537929...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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15d7cf731db00e8c52166c576533eb650b0aef6a
subsection
28
114
Calculations at higher loops
The odd part of the two-loop six-point amplitude was constructed only through this method .
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 91, "openalex_id": "", "raw": "F. Cachazo, M. Spradlin and A. Volovich, “Leading Singularities of the Two-Loop Six-Particle MHV Amplitude,” arXiv:0805.4832 [hep-th].", "source_ref_id": "faeefcf30827e15c4ebe131e8ed2a42076053c...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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af56ebc43134fb42af6ec7d40e637d3deba090f0
subsection
29
114
Some explicit higher loop results at low multiplicity
Using generalized unitarity, a number of higher loop amplitudes have been explicitly computed and their properties analyzed. Due to the increase in the number of kinematic invariants with the number of external particles, the complexity of the analysis increases as the number of external legs is increased. Here we disc...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 770, "openalex_id": "", "raw": "Z. Bern, J. S. Rozowsky and B. Yan, “Two-loop four-gluon amplitudes in N = 4 super-Yang-Mills,” Phys. Lett. B 401, 273 (1997) [arXiv:hep-ph/9702424].", "source_ref_id": "a9757d22e4d134b2f42828...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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f59c15432d6dcdccc9a8e57680acdf1fad3708dd
subsection
30
114
Some explicit higher loop results at low multiplicity
The product of the first two tree-level amplitudes may be easily reorganized following equation (REF ) to beA_4^{\rm tree}{\scriptstyle (l_2, k_1^-, k_2^-, l_1)} A_4^{\rm tree}{\scriptstyle (-l_1, -l_4, -l_3, -l_2)} =i s_{12}(k_2-l_4)^2 A{\scriptstyle (-l_3,1^-,2^-,-l_4)} \frac{1}{(l_2-k_1)^2(l_2+l_3)^2}~~.Further appl...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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49e822aebacf475b1f928c1a1428201ab9fb045b
subsection
31
114
Some explicit higher loop results at low multiplicity
Thus, one finds that they imply that the two-loop four-gluon amplitude in {\cal N}=4 SYM is (for any choice of helicity assignment) given by {\cal M}^{(2)}_4{\scriptstyle (k_1,k_2,k_3,k_4)} =-\frac{1}{4} s_{12}s_{23}\left\lbrace ~s_{12} \hbox{~\mbox{\includegraphics [scale=.25]{sch_2lp}}}\right.~+\;s_{23} \hbox{~\mbox{...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 275, "openalex_id": "", "raw": "Z. Bern, J. S. Rozowsky and B. Yan, “Two-loop four-gluon amplitudes in N = 4 super-Yang-Mills,” Phys. Lett. B 401, 273 (1997) [arXiv:hep-ph/9702424].", "source_ref_id": "a9757d22e4d134b2f42828...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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608f476ca413b366d1a2b0e036f6ac364c3782d4
subsection
32
114
A possible integral basis at higher loops; Conformal integrals
{\cal N}=4 SYM is a conformal field theory at the quantum level; conformal invariance may be observed in correlation functions of operators of definite (anomalous) dimension. In the context of the AdS/CFT correspondence this symmetry is related to the existence of an exact SO(2,4) isometry of the anti-de-Sitter space. ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 675, "openalex_id": "", "raw": "F. Cachazo, P. Svrcek and E. Witten, “Gauge theory amplitudes in twistor space and holomorphic anomaly,” JHEP 0410, 077 (2004) [arXiv:hep-th/0409245].", "source_ref_id": "8be9f5015009e40922fa5...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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988bf4c4be6cf44786834726c50dbb51e3fd04c0
subsection
33
114
A possible integral basis at higher loops; Conformal integrals
Up to numerator factors, the relevant integral isI_a=\int d^4 x_5 \frac{1}{x_{51}^2x_{52}^2 x_{53}^2 x_{54}^2}~~;each of the propagators present is denoted by a solid line in figure REF a. As mentioned, under inversion this integral transforms asI:I_a\mapsto \int \frac{d^4 x_5}{(x_5^2)^4} \frac{(x_5^2x_1^2)(x_5^2x_2^2)...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1189, "openalex_id": "", "raw": "J. M. Drummond, J. Henn, V. A. Smirnov and E. Sokatchev, “Magic identities for conformal four-point integrals,” JHEP 0701, 064 (2007) [arXiv:hep-th/0607160].", "source_ref_id": "6bebe53286cef...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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86d99939bb583a99cdf010481d083166b0007425
subsection
34
114
A possible integral basis at higher loops; Conformal integrals
Figure REF ) and the even part of the two-loop six-point amplitude which we shall review shortly.It is not clear what is the underlying reason for the appearance of dual conformal invariance at weak coupling. It is moreover not clear whether its appearance persists to all loop orders (perhaps up to integrals whose inte...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 368, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. A. Kosower, R. Roiban, M. Spradlin, C. Vergu and A. Volovich, “The Two-Loop Six-Gluon MHV Amplitude in Maximally Supersymmetric Yang-Mills Theory,” arXiv:0803.1465 [hep-th]....
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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a79b1f4384195ced94cfc0fd8e50a81ff31a223b
subsection
35
114
The BDS conjecture and potential departures form it
In section REF we discussed, following , , higher loop corrections to the four-gluon amplitude. The direct evaluation of the integrals in the two-loop four-gluon amplitude reveals a surprising structure: up to terms of order \epsilon ,{\cal M}_4^{(2)}(\epsilon )&=& \frac{1}{2}\left({\cal M}_4^{(1)}(\epsilon )\right)^2 ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 96, "openalex_id": "", "raw": "Z. Bern, J. S. Rozowsky and B. Yan, “Two-loop four-gluon amplitudes in N = 4 super-Yang-Mills,” Phys. Lett. B 401, 273 (1997) [arXiv:hep-ph/9702424].", "source_ref_id": "a9757d22e4d134b2f42828e...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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cd6b9d2d636a073428eca59144c4b32cffbfbaed
subsection
36
114
The BDS conjecture and potential departures form it
Assuming that the same is true for the splitting amplitude, Bern, Dixon and Smirnov suggested that, to all loop orders, the rescaled n-point MHV amplitude is given by{\cal M}_n= \exp \left[\sum _{l=1}^\infty \, a^l f^{(l)}(\epsilon ){\cal M}^{(1)}_n(l\epsilon )+C^{(l)} +{\cal O}(\epsilon )\right]where the coefficients...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 435, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon and V. A. Smirnov, “Iteration of planar amplitudes in maximally supersymmetric Yang-Mills theory at three loops and beyond,” Phys. Rev. D 72, 085001 (2005) [arXiv:hep-th/0505205...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
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Physics
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af6b5daf72dbac138cfe2bcd1c949c57d19915f1
subsection
37
114
The BDS conjecture and potential departures form it
Then, taking the collinear limit of the five-point amplitude immediately yields (REF ).The infrared poles are apparent in the equation (REF ) and, using equation (REF ), may be readily isolated together with the associated dependence on the two-particle invariants:{\rm Div}_n = -\sum _{i=1}^n \Biggl [ \frac{1}{8 \epsil...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
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Physics
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4181f4f119547caa5828a1bebe1180ab71dc203f
subsection
38
114
The BDS conjecture and potential departures form it
For the even case (n=2m) these quantities are given byD_{2m,i} &=& -\sum _{r=2}^{m-2} {\rm Li}_2 \Biggl ( 1- \frac{t_i^{[r]} t_{i-1}^{[r+2]}}{t_i^{[r+1]}t_{i-1}^{[r+1]}} \Biggr ) - \frac{1}{2} {\rm Li}_2 \Biggl ( 1- \frac{t_{i}^{[m-1]} t_{i-1}^{[m+1]}}{t_i^{[m]} t_{i-1}^{[m]}} \Biggr ) \,, \\ L_{2m,i} &=& \frac{1}{4} \...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 829, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. C. Dunbar and D. A. Kosower, “One loop n point gauge theory amplitudes, unitarity and collinear limits,” Nucl. Phys. B 425, 217 (1994) [arXiv:hep-ph/9403226].", "sourc...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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72219788ca0d5f988a3db61fbad791bf126b8b19
subsection
39
114
The BDS conjecture and potential departures form it
Explicit calculations show that, at least at two-loop order, all parity-odd terms in the six-point amplitude exponentiate following the BDS ansatz.u_1= \frac{s_{12}s_{45}}{s_{123}s_{345}}~~~~ u_2= \frac{s_{23}s_{56}}{s_{234}s_{123}}~~~~ u_3= \frac{s_{34}s_{61}}{s_{345}s_{234}}~~.The number of such cross-ratios – i.e. x...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 281, "openalex_id": "", "raw": "F. Cachazo, M. Spradlin and A. Volovich, “Leading Singularities of the Two-Loop Six-Particle MHV Amplitude,” arXiv:0805.4832 [hep-th].", "source_ref_id": "faeefcf30827e15c4ebe131e8ed2a42076053...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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ec52ea3629ed5560a2310bfb32de5d9155d8b852
subsection
40
114
The six-point MHV amplitude at two-loops and the BDS ansatz
As previously mentioned, the ABDK/BDS ansatz was constructed based on explicit calculations of four gluon amplitudes at two- and three-loop orders as well as of the collinear splitting amplitudes at two-loop order and was subsequently tested through the calculation of the five-point amplitude at two-loops. Assuming tha...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1339, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. A. Kosower, R. Roiban, M. Spradlin, C. Vergu and A. Volovich, “The Two-Loop Six-Gluon MHV Amplitude in Maximally Supersymmetric Yang-Mills Theory,” arXiv:0803.1465 [hep-th]...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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9f108cb472e60a4eb5b8254d4f9144eb70570168
subsection
41
114
The six-point MHV amplitude at two-loops and the BDS ansatz
As before, \mu _p and \mu _q denote the(-2\epsilon )-dimensional part of the loop momenta.]The four-dimensional cut-constructible parity-even part of the amplitude is given entirely in terms of pseudo-conformal integrals ;M_6^{(2),D=4}(\epsilon ) &=& \frac{1}{16} \sum _{12~{\rm perms.}} \Bigg [ \frac{1}{4} c_1 I^{(1)}(...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 796, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. A. Kosower, R. Roiban, M. Spradlin, C. Vergu and A. Volovich, “The Two-Loop Six-Gluon MHV Amplitude in Maximally Supersymmetric Yang-Mills Theory,” arXiv:0803.1465 [hep-th]....
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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b152066350b526fdd0e90cc1a0dff2cdc91e4db7
subsection
42
114
The six-point MHV amplitude at two-loops and the BDS ansatz
Their relative coefficients are 0,\pm 1,\pm 2 and \pm 4, which represents a chance of patterns from the four- and five-point amplitudes where they were only 0 and \pm 1. It is currently unclear what is the origin of this change.The remaining parity-even part of the amplitude, which may be determined by performing gener...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 864, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. A. Kosower, R. Roiban, M. Spradlin, C. Vergu and A. Volovich, “The Two-Loop Six-Gluon MHV Amplitude in Maximally Supersymmetric Yang-Mills Theory,” arXiv:0803.1465 [hep-th]....
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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8809430ee77bd8695acfaf96e76d76f0b3721d27
subsection
43
114
The six-point MHV amplitude at two-loops and the BDS ansatz
For this purpose it is instructive to identify the origin of the remainder function within the arguments that led to this ansatz. In short, the full structure of collinear limits for n-point amplitudes with n\ge 6 is somewhat more involved. One may consider limits in which more than two particles are simultaneously col...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 766, "openalex_id": "", "raw": "Z. Bern, L. J. Dixon, D. A. Kosower, R. Roiban, M. Spradlin, C. Vergu and A. Volovich, “The Two-Loop Six-Gluon MHV Amplitude in Maximally Supersymmetric Yang-Mills Theory,” arXiv:0803.1465 [hep-th]....
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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a3a1ee31f3537c292c827347f716c7257b3c72a1
subsection
44
114
Scattering amplitudes at strong coupling through the AdS/CFT duality
The AdS/CFT correspondence , , provides the only direct access to the strong coupling regime of the {\cal N}=4 SYM; it relates four-dimensional {\cal N}=4 SYM theory and type IIB string theory on AdS_5 \times S^5 space through the identification of string states and gauge-invariant operators. The two gauge theory param...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 294, "openalex_id": "", "raw": "J. M. Maldacena, “The large N limit of superconformal field theories and supergravity,” Adv. Theor. Math. Phys. 2 (1998) 231 [Int. J. Theor. Phys. 38 (1999) 1113] [arXiv:hep-th/9711200].", "so...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
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Physics
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83a56d6b4d8853061f07577877d6e3fd2e85133e
subsection
45
114
The general construction
In the presence of an open string sector on the string theory side of the AdS/CFT correspondence, the calculation of open string scattering amplitudes in the Poincaré patch is, in principle, conceptually straightforward: one simply computes the transition amplitude between some in and out asymptotic states. To describe...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 964, "openalex_id": "", "raw": "L. F. Alday and J. M. Maldacena, “Gluon scattering amplitudes at strong coupling,” JHEP 0706, 064 (2007) [arXiv:0705.0303 [hep-th]].", "source_ref_id": "d6cbe432fa71a63c9bfec171d91c197adf561ce...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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42090f6254d173af798a3734f282196f32989676
subsection
46
114
The general construction
Thus, when described in terms of vertex operators placed on the regulator D3-brane, the scattering process occurs at arbitrarily high (proper) momenta and fixed angle.In flat space this regime was studied by Gross, Mende and Manes , . The key result of their analysis is that, to leading order in the large momentum expa...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 234, "openalex_id": "", "raw": "D. J. Gross and P. F. Mende, “The High-Energy Behavior of String Scattering Amplitudes,” Phys. Lett. B 197 (1987) 129.", "source_ref_id": "66b764eacf003a1e5f654c29a2e5ad52db11d5da", "sta...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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5bb846f7db7523969250f95ede49958f8e8e01b4
subsection
47
114
The general construction
From (REF ) it follows that the curvature expansion is a series in \frac{1}{\sqrt{\lambda }} which should therefore reproduce the strong coupling expansion of scattering amplitudes.To summarize this (long) argument, the leading term in the strong coupling expansion of a scattering amplitude of states in {\cal N}=4 SYM ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1001, "openalex_id": "", "raw": "L. F. Alday and J. M. Maldacena, “Gluon scattering amplitudes at strong coupling,” JHEP 0706, 064 (2007) [arXiv:0705.0303 [hep-th]].", "source_ref_id": "d6cbe432fa71a63c9bfec171d91c197adf561c...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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65280e54d3c4af4fdf0a3038fb307d4d3c176ee1
subsection
48
114
The general construction
The transformation (REF ) has a similar effect: the zero-mode of the field y corresponding to the momentum k^\mu (and described by a local vertex operator) is replaced by a “winding” mode of the field x implying that the difference between the two endpoints of the string obeys\Delta x^\mu =2 \pi k^\mu ~~,as may be seen...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2374, "openalex_id": "", "raw": "S. J. Rey and J. T. Yee, “Macroscopic strings as heavy quarks in large N gauge theory and anti-de Sitter supergravity,” Eur. Phys. J. C 22 (2001) 379 [arXiv:hep-th/9803001].", "source_ref_id"...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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47342e0aa0053701d9776055db4bdcc6e8ace491
subsection
49
114
The general construction
Thus, one finds one light-like polygon for each color-ordered amplitude. The corresponding color factor may be reconstructed from the order of momenta of particles.In the following, we will show in detail how this construction works for the scattering of four gluons and compare our results with field theory expectation...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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57f731e797aa818df9524112ae991f5bba7ef7e0
subsection
50
114
Four gluon scattering
The simplest scattering process involves four particles and is characterized by the usual Mandelstam invariantss=-(k_1+k_2)^2 ~,~~~~ t=-(k_2+k_3)^2The discussion in the previous section suggests that, in the strongly coupled {\cal N}=4 SYM theory, the amplitude for this process is governed by the minimal surface ending...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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608c5e48985484a8e18084c8810b00cbd0092829
subsection
51
114
The single cusp solution
As a warm up exercise let us discuss the solution near the cusp where two of the light-like lines meet. This problem was originally considered in and it will prove useful for generating the solution relevant for the four-gluon scattering. The surface can be embedded into an AdS_3 subspace of AdS_5ds^2=\frac{-dx_0^2+dx_...
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10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
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Physics
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c905bfea7b81dcc87ee57a2677d91e1c5504a4f1
subsection
52
114
Four cusps solution
The four cusps solution is closely related to the single cusp solution discussed above. The relevant solution of the Nambu Goto action can be embedded in a AdS_4 subspace of AdS_5, parametrized by (r,x_0,x_1,x_2,x_3=0). It is moreover convenient to fix reparametrization invariance by choosing (\sigma _1,\sigma _0)=(x_1...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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08e31004cd5d738344eae168b274f264d3207be6
subsection
53
114
Four cusps solution
The Poincaré coordinates ({\bf x},r) are but a particular solution of the constraint equation (REF ):X^\mu &=&\frac{x^\mu }{r},~~~~~~\mu =0,...,3 \\ X_{-1}+X_4&=&\frac{1}{r},\hspace{21.68121pt}X_{-1}-X_4=\frac{r^2+x_\mu x^\mu }{r}~~.Direct use of the solution (REF ) implies that, in the embedding coordinates, the minim...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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ab38f3ad70d597ff47c825d419e2552f93b12d46
subsection
54
114
Four cusps solution
The solution can be conveniently written asr={a \over \cosh u_1 \cosh u_2+b \sinh u_1 \sinh u_2},~~~~ x_0= {a \sqrt{1+b^2} \sinh u_1 \sinh u_2 \over \cosh u_1 \cosh u_2+b \sinh u_1 \sinh u_2} \\ x_1={a \sinh u_1 \cosh u_2 \over \cosh u_1 \cosh u_2+b \sinh u_1 \sinh u_2},~~~~ x_2={a \cosh u_1 \sinh u_2 \over \cosh u_1 \...
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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6920097de5bebb094ad845ecb1ead22b25e03870
subsection
55
114
Dimensional regularization at strong coupling
Gauge theory amplitudes are regularized by considering the theory in D=4-2\epsilon dimensions. More precisely (see discussion in section 2), one starts with {\cal N}=1 in ten dimensions and then dimensionally reduces to 4-2\epsilon dimensions. For integer 2\epsilon this is precisely the low energy theory living on a Dp...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1158, "openalex_id": "", "raw": "M. J. Duff, R. R. Khuri and J. X. Lu, “String solitons,” Phys. Rept. 259, 213 (1995) [arXiv:hep-th/9412184].", "source_ref_id": "1a6a3915ffba9221b7659ae169a41c8c046734d2", "start": 654 ...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
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Physics
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7a714e468ce167dba93183bf94b5ad59587f9dad
subsection
56
114
Dimensional regularization at strong coupling
The evaluation of integrals leads to S \approx \sqrt{\lambda } \frac{\mu ^\epsilon }{a^\epsilon } ~ _2 F_1\left( \frac{1}{2},-\frac{\epsilon }{2},\frac{1-\epsilon }{2};b^2 \right)~~.Finally, expanding in powers of \epsilon yields the final answer{\cal A}&=&e^{i S}=\exp \left[i S_{div}+\frac{\sqrt{\lambda }}{8\pi }\left...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 182, "openalex_id": "", "raw": "L. F. Alday and J. M. Maldacena, “Gluon scattering amplitudes at strong coupling,” JHEP 0706, 064 (2007) [arXiv:0705.0303 [hep-th]].", "source_ref_id": "d6cbe432fa71a63c9bfec171d91c197adf561ce...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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7b6ffb0ad9f65b01bafb2e192b79167846abccd0
subsection
57
114
Dimensional regularization at strong coupling
Thus, similarly to the weak coupling result of , , , the cusp anomaly equals the large spin limit of the anomalous dimension of twist-2 operators to all orders in the 1/\sqrt{\lambda } expansion.f(\lambda )=\frac{\sqrt{\lambda }}{\pi }~~.Moreover, from (REF ) one could extract the strong coupling behavior of the functi...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 238, "openalex_id": "", "raw": "G. P. Korchemsky, “Asymptotics of the Altarelli-Parisi-Lipatov Evolution Kernels of Parton Distributions,” Mod. Phys. Lett. A 4, 1257 (1989).", "source_ref_id": "bae0651683c733ac08084f221f0b06...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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6fcf8c61a5d99317aaae94987f00e5e7ee418925
subsection
58
114
Radial Cut-off
A more common regularization scheme for computing minimal areas in AdS is to introduce a cut-off in the radial direction. The correct procedure would be to impose the boundary conditions at some small r=r_c. It turns out, however, that in order to compute the finite piece as r_c \rightarrow 0 it suffices to use the ori...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1671, "openalex_id": "", "raw": "J. M. Drummond, G. P. Korchemsky and E. Sokatchev, “Conformal properties of four-gluon planar amplitudes and Wilson loops,” Nucl. Phys. B 795 (2008) 385 [arXiv:0707.0243 [hep-th]].", "source_...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
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Physics
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4edc1c21c400aade31c3edb67c1c782f2f59bd4a
subsection
59
114
Structure of infrared poles at strong coupling
Even if the relevant solutions for minimal surfaces for the cases n>4 are presently unknown, the IR structure of amplitudes at strong coupling for the general case of n-point amplitudes can easily be understood.Given the cusp formed by a pair of neighboring gluons with momenta k_i and k_{i+1} we associate the kinematic...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 637, "openalex_id": "", "raw": "E. I. Buchbinder, “Infrared Limit of Gluon Amplitudes at Strong Coupling,” Phys. Lett. B 654, 46 (2007) [arXiv:0706.2015 [hep-th]].", "source_ref_id": "d515b02a8bc63fda78b055225069ed6c8ad308b7...
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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fcc9be799da383fced316f56a97ae8d5f75a22fc
subsection
60
114
Structure of infrared poles at strong coupling
For instance, a simple example is that of a cut-off that takes the value r_c(x_i) at the ith cusp and varies linearly between cusp and cusp, in this caseE_{edge}^i ={\sqrt{\lambda } \over 4 \pi } \log ^2{r_c(x_i) \over r_c(x_{i+1})}
{ "cite_spans": [] }
10.1016/j.physrep.2008.08.002
0807.1889
Scattering Amplitudes, Wilson Loops and the String/Gauge Theory Correspondence
[ "Luis F. Alday", "Radu Roiban" ]
[ "hep-th" ]
2,008
en
Physics
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