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The Lefschetz thimble and the sign problem: In this talk I review the proposal to formulate quantum field theories (QFTs)
on a Lefschetz thimble, which was put forward to enable Monte Carlo simulations
of lattice QFTs affected by sign problem. First I will review the theoretical
justification of the approach, and comme... | hep-lat |
Correlation functions and critical behaviour on fluctuating geometries: We study the two-point correlation function in the model of branched polymers
and its relation to the critical behaviour of the model. We show that the
correlation function has a universal scaling form in the generic phase with the
only scale given... | hep-lat |
Two topics from lattice NRQCD at non-zero temperature: heavy quark mass
dependence and S-wave bottomonium states moving in a thermal bath: Using Non-Relativistic QCD (NRQCD), we study heavy quark mass dependence of
S-wave and P-wave bottomonium correlators for 0.42Tc <= T <= 2.09Tc and study
spectral functions of S-w... | hep-lat |
On the possibility of the critical behavior of LGT in the area of
asymptotically large β: Coupling dependence on lattice spacing and size is estimated analytically at
\beta -> \infty region where for a->0 the critical area is shifted in
accordance with Callan-Symanzik relation. In considered approximation no trace
of... | hep-lat |
Impact of stout-link smearing in lattice fermion actions: The impact of stout-link smearing in lattice fermion actions is examined
through the consideration of the mass and renormalization functions of the
overlap quark propagator over a variety of smeared configurations. Up to six
sweeps of stout-link smearing are inv... | hep-lat |
Charmonium Potentials at Finite Temperature: The charmonium states at non-zero temperature are studied on anisotropic
lattices with 2 dynamical quark flavours. Non-local operators are used to
determine the Nambu-Bethe-Salpeter (NBS) wavefunctions via both conventional
fitting methods and the Maximum Entropy Method. The... | hep-lat |
Quark Propagation in the Instantons of Lattice QCD: We quantitatively examine the extent to which instanton degress of freedom,
contained within standard Monte-carlo generated gauge-field configurations, can
maintain the characteristic features of the mass and renormalisation functions
of the non-perturbative quark pro... | hep-lat |
Bottomonium above deconfinement in lattice nonrelativistic QCD: We study the temperature dependence of bottomonium for temperatures in the
range $0.4 T_c < T < 2.1 T_c$, using nonrelativistic dynamics for the bottom
quark and full relativistic lattice QCD simulations for $N_f=2$ light flavors
on a highly anisotropic la... | hep-lat |
SU(3) Lattice Gauge Theory in the Fundamental--Adjoint Plane and Scaling
Along the Wilson Axis: We present further evidence for the bulk nature of the phase transition line
in the fundamental--adjoint action plane of SU(3) lattice gauge theory.
Computing the string tension and some glueball masses along the thermal p... | hep-lat |
Calculation of the running coupling in non-Abelian gauge theories from
Jarzynski's equality: We discuss the theoretical foundations of non-equilibrium Monte Carlo
simulations based on Jarzynski's equality and present, as an example of
application, the determination of the running coupling in the
Schr\"odinger-functio... | hep-lat |
P-wave nucleon-pion scattering amplitude in the $Δ(1232)$ channel
from lattice QCD: We determine the $\Delta(1232)$ resonance parameters using lattice QCD and
the L\"uscher method. The resonance occurs in elastic pion-nucleon scattering
with $J^P=3/2^+$ in the isospin $I = 3/2$, $P$-wave channel. Our calculation is
p... | hep-lat |
Running Gluon Mass from Landau Gauge Lattice QCD Propagator: The interpretation of the Landau gauge lattice gluon propagator as a massive
type bosonic propagator is investigated. Three different scenarios are
discussed: i) an infrared constant gluon mass; ii) an ultraviolet constant
gluon mass; iii) a momentum dependen... | hep-lat |
The S, U and Δρparameters in the Zaragoza proposal for lattice
chiral gauge fermions: Using the Zaragoza proposal for lattice chiral gauge fermions, the S, U and
\Delta\rho parameters have been calculated at one loop. It is shown that the
continuum values for these quantities can be reproduced without requiring
expli... | hep-lat |
The chromomagnetic operator on the lattice: We present our study of the renormalization of the chromomagnetic
operator,O(CM), which appears in the effective Hamiltonian describing Delta S =
1 transitions in and beyond the Standard Model. We have computed,
perturbatively to one-loop, the relevant Green's functions with ... | hep-lat |
General properties of logarithmically divergent one-loop lattice Feynman
integrals: We prove that logarithmically divergent one-loop lattice Feynman integrals
have the general form I(p,a) = f(p)log(aM)+g(p,M) up to terms which vanish for
lattice spacing a -> 0. Here p denotes collectively the external momenta and M
i... | hep-lat |
Hadronic Coupling Constants in Lattice QCD: We calculate the hadronic coupling constants $g_{NN\pi}$ and $g_{\rho\pi\pi}$
in QCD, including dynamical quarks in the framework of staggered fermions in
the lattice approach. For the nucleon--pion coupling we obtain $g_{NN\pi} =
13.8 \pm 5.8$, to be compared with the experi... | hep-lat |
Solution to new sign problems with Hamiltonian Lattice Fermions: We present a solution to the sign problem in a class of particle-hole
symmetric Hamiltonian lattice fermion models on bipartite lattices using the
idea of fermion bags. The solution remains valid when the particle-hole
symmetry is broken through a stagger... | hep-lat |
Convergence of chiral effective field theory: We formulate the expansion for the mass of the nucleon as a function of pion
mass within chiral perturbation theory using a number of different ultra-violet
regularisation schemes; including dimensional regularisation and various
finite-ranged regulators. Leading and next-t... | hep-lat |
Two-Baryon Systems with Twisted Boundary Conditions: We explore the use of twisted boundary conditions in extracting the nucleon
mass and the binding energy of two-baryon systems, such as the deuteron, from
Lattice QCD calculations. Averaging the results of calculations performed with
periodic and anti-periodic boundar... | hep-lat |
Chiral Determinant as an Overlap of Two Vacua: The effective action induced by chiral fermions can be written, formally, as
an overlap of two states. These states are the Fock ground states of
Hamiltonians for fermions in even dimensional space with opposite sign mass
terms coupled to identical static vector potentials... | hep-lat |
Effects of non-perturbatively improved dynamical fermions in UKQCD
simulations: We present results for QCD with 2 degenerate flavours of quark using a
non-perturbatively improved action on a lattice volume of $16^3\times32$ where
the bare gauge coupling and bare dynamical quark mass have been chosen to
maintain a fix... | hep-lat |
Solving the left-hand cut problem in lattice QCD: $T_{cc}(3875)^+$ from
finite volume energy levels: A novel effective-field-theory-based approach is implemented for extracting
two-body scattering information from finite volume energies, serving as an
alternative to L\"uscher's method. By explicitly incorporating one... | hep-lat |
Schwinger-Keldysh on the lattice: a faster algorithm and its application
to field theory: A new algorithm is developed allowing the Monte Carlo study of a 1 + 1
dimensional theory in real time. The main algorithmic development is to avoid
the explicit calculation of the Jacobian matrix and its determinant in the
upda... | hep-lat |
Test for a universal behavior of Dirac eigenvalues in the complex
Langevin method: We apply the complex Langevin (CL) method to a chiral random matrix theory
(ChRMT) at non-zero chemical potential and study the nearest neighbor spacing
(NNS) distribution of the Dirac eigenvalues. The NNS distribution is extracted
usi... | hep-lat |
Polyakov loop effects on the phase diagram in strong-coupling lattice
QCD: We investigate the Polyakov loop effects on the QCD phase diagram by using
the strong-coupling (1/g^2) expansion of the lattice QCD (SC-LQCD) with one
species of unrooted staggered quark, including O}(1/g^4) effects. We take
account of the eff... | hep-lat |
A lattice regularization of Weyl fermions in a gravitational background: We report on a lattice fermion formulation with a curved domain-wall mass
term to nonperturbatively describe fermions in a gravitational background. In
our previous work in 2022, we showed under the time-reversal symmetry that the
edge-localized m... | hep-lat |
Lattice real-time simulations with learned optimal kernels: We present a simulation strategy for the real-time dynamics of quantum
fields, inspired by reinforcement learning. It builds on the complex Langevin
approach, which it amends with system specific prior information, a necessary
prerequisite to overcome this exc... | hep-lat |
Double parton distributions in the nucleon from lattice QCD: We evaluate nucleon four-point functions in the framework of lattice QCD in
order to extract the first Mellin moment of double parton distributions (DPDs)
in the unpolarized proton. In this first study, we employ an nf = 2 + 1
ensemble with pseudoscalar masse... | hep-lat |
Non-relativistic bound states in a finite volume: We derive general results for the mass shift of bound states with angular
momentum l >= 1 in a periodic cubic box in two and three spatial dimensions.
Our results have applications to lattice simulations of hadronic molecules,
halo nuclei, and Feshbach molecules. The si... | hep-lat |
Lattice QCD Calculation of Electroweak Box Contributions to Superallowed
Nuclear and Neutron Beta Decays: We present the first lattice QCD calculation of the universal axial $\gamma
W$-box contribution $\square_{\gamma W}^{VA}$ to both superallowed nuclear and
neutron beta decays. This contribution emerges as a signi... | hep-lat |
Phase structure of four flavor QCD in the T μplane from a new method
for simulations of lattice gauge theories at non zero baryon density: We review a method for numerical simulations of lattice gauge theories at
non-zero baryonic chemical potential we recently proposed. We first report on a
test of the method using ... | hep-lat |
Light Quark Masses with Dynamical Wilson Fermions: We determine the masses of the light and the strange quarks in the
$\bar{MS}$-scheme using our high-statistics lattice simulation of QCD with
dynamical Wilson fermions. For the light quark mass we find
$m^{light}_{\bar{MS}}(2 GeV) = 2.7(2) MeV$, which is lower than in ... | hep-lat |
Core -- a New Method for Solving Hamiltonian Lattice Systems: The COntractor REnormalization group (CORE) approximation, a new method for
solving Hamiltonian lattice systems, is introduced. The approach combines
variational and contraction techniques with the real-space renormalization
group approach and is systematica... | hep-lat |
Phases at finite winding number of an Abelian lattice gauge theory: Pure gauge theories are rather different from theories with pure scalar and
fermionic matter, especially in terms of the nature of excitations. For
example, in scalar and fermionic theories, one can create ultra-local
excitations. For a gauge theory, s... | hep-lat |
Quantum tunneling in the real-time path integral by the Lefschetz
thimble method: Quantum tunneling is mostly discussed in the Euclidean path integral
formalism using instantons. On the other hand, it is difficult to understand
quantum tunneling based on the real-time path integral due to its oscillatory
nature, whic... | hep-lat |
Cutoff effects in twisted mass lattice QCD: We present a first numerical study of lattice QCD with O(a) improved Wilson
quarks and a chirally twisted mass term. Renormalized correlation functions are
derived from the Schroedinger functional and evaluated in an intermediate
space-time volume of size 0.75^3 x 1.5 fm^4. I... | hep-lat |
Excited state baryon spectroscopy from lattice QCD with spin
identification: Lattice QCD calculations are presented for the spectra of N* excited states
with spins up to J = 7/2. Ambiguities of the standard method of spin
identification are shown to be overcome by the use of lattice operators that
transform according... | hep-lat |
Three-particle finite-volume formalism for $π^+π^+ K^+$ and related
systems: We consider three-particle systems consisting of two identical particles and
a third that is different, with all being spinless. Examples include
$\pi^+\pi^+ K^+$ and $K^+K^+\pi^+$. We derive the formalism necessary to
extract two- and three... | hep-lat |
Interplay between sign problem and Z_3 symmetry in three-dimensional
Potts model: We construct four kinds of Z3-symmetric three-dimentional (3-d) Potts models,
each with different number of states at each site on a 3-d lattice, by
extending the 3-d three-state Potts model. Comparing the ordinary Potts model
with the ... | hep-lat |
K^0--\bar{K}^0 mixing in full lattice QCD: There are at least two methods to calculate $ B_K $ with staggered fermions:
one is the two spin trace formalism and the other is the one spin trace
formalism. We have performed numerical simulations on a $ 16^3 \times 40 $
lattice in full QCD with $ \beta = 5.7 $ and a dynami... | hep-lat |
Remarks on the quantum gravity interpretation of 4D dynamical
triangulation: We review some of the phenomenology in 4D dynamical triangulation and explore
its interpretation in terms of a euclidean effective action of the continuum
form $\intx \sqrt{g} [\mu -\frac{1}{16\pi G} R + \cdots]$. | hep-lat |
Phase Quenched Lattice QCD at Finite Density and Temperature: We simulate 3-flavour lattice QCD at finite quark-number chemical potential
mu in the phase-quenched approximation, close to the finite temperature
transition. Working close to the critical quark mass, we find no evidence for
the expected critical endpoint a... | hep-lat |
Light hadron spectroscopy with O(a) improved dynamical fermions: We present the first results for the static quark potential and the light
hadron spectrum using dynamical fermions at $\beta=5.2$ using an O(a) improved
Wilson fermion action together with the standard Wilson plaquette action for
the gauge part. Sea quark... | hep-lat |
High-loop perturbative renormalization constants for Lattice QCD (II):
three-loop quark currents for tree-level Symanzik improved gauge action and
n_f=2 Wilson fermions: Numerical Stochastic Perturbation Theory was able to get three- (and even
four-) loop results for finite Lattice QCD renormalization constants. Mo... | hep-lat |
Renormalization constants for $N_{\rm f}=2+1+1$ twisted mass QCD: We summarize recent non-perturbative results obtained for the renormalization
constants computed in the RI'-MOM scheme for $N_{\rm f}=2+1+1$ twisted mass
QCD. Our implementation employs the Iwasaki gauge action and four dynamical
degenerate twisted mass ... | hep-lat |
Rigidity and percolation of center vortices: Effective action of center vortices in SU(2) lattice gauge theory is
investigated by studying the correlation between the action density on their
worldsheets and their geometric properties. It turns out that center vortices
are rigid, however, their dynamics is more complica... | hep-lat |
Unpolarized gluon distribution in the nucleon from lattice quantum
chromodynamics: In this study, we present a determination of the unpolarized gluon Ioffe-time
distribution in the nucleon from a first principles lattice quantum
chromodynamics calculation. We carry out the lattice calculation on a
$32^3\times 64$ ens... | hep-lat |
Lattice QCD constraints on the parton distribution functions of
${}^3\text{He}$: The fraction of the longitudinal momentum of ${}^3\text{He}$ that is carried
by the isovector combination of $u$ and $d$ quarks is determined using lattice
QCD for the first time. The ratio of this combination to that in the
constituent ... | hep-lat |
SO(2N) and SU(N) gauge theories: We present our preliminary results of SO(2N) gauge theories, approaching the
large-N limit. SO(2N) theories may help us to understand QCD at finite chemical
potential since there is an orbifold equivalence between SO(2N) and SU(N) gauge
theories at large-N and SO(2N) theories do not hav... | hep-lat |
Multi-hadron interactions from lattice QCD: First-principles calculations of multi-hadron dynamics are a crucial goal in
lattice QCD. Significant progress has been achieved in developing,
implementing, and applying theoretical tools that connect finite-volume
quantities to their infinite-volume counterparts. Here, I re... | hep-lat |
Lattice diffeomorphism invariance: We propose a lattice counterpart of diffeomorphism symmetry in the continuum.
A functional integral for quantum gravity is regularized on a discrete set of
space-time points, with fermionic or bosonic lattice fields. When the
space-time points are positioned as discrete points of a co... | hep-lat |
Thermal monopole condensation in QCD with physical quark masses: Thermal monopoles, identified after Abelian projection as magnetic currents
wrapping non-trivially around the thermal circle, are studied in $N_f = 2+1$
QCD at the physical point. The distribution in the number of wrappings, which
in pure gauge theories p... | hep-lat |
A non-perturbative calculation of the mass of the Bc: We present a calculation of the mass of the 1S0 pseudoscalar anti-b c (Bc)
state using a non-perturbative measurement from quenched lattice QCD. We find
M_Bc = 6.386(9)(98)(15) GeV where the first error is statistical, the second
systematic due to the quark mass amb... | hep-lat |
An estimate for the thermal photon rate from lattice QCD: We estimate the production rate of photons by the quark-gluon plasma in
lattice QCD. We propose a new correlation function which provides better
control over the systematic uncertainty in estimating the photon production
rate at photon momenta in the range {\pi}... | hep-lat |
Quark contribution to the proton spin from 2+1+1-flavor lattice QCD: We present the first chiral-continuum extrapolated up, down and strange quark
spin contribution to the proton spin using lattice QCD. For the connected
contributions, we use eleven ensembles of 2+1+1-flavor of Highly Improved
Staggered Quarks (HISQ) g... | hep-lat |
Large N: I review some of the things we have learned about large N gauge theories (and
QCD at N=oo) from lattice calculations in recent years. I point to some open
problems. | hep-lat |
Gauge-fixing approach to lattice chiral gauge theories: We review the status of our recent work on the gauge-fixing approach to
lattice chiral gauge theories. New numerical results in the reduced version of
a model with a U(1) gauge symmetry are presented which strongly indicate that
the factorization of the correlatio... | hep-lat |
Nucleon Structure in Lattice QCD using twisted mass fermions: We present results on the nucleon form factors and moments of generalized
parton distributions obtained within the twisted mass formulation of lattice
QCD. We include a discussion of lattice artifacts by examining results at
different volumes and lattice spa... | hep-lat |
N=1 super Yang-Mills on a (3+1) dimensional transverse lattice with one
exact supersymmetry: We formulate ${\cal N}$=1 super Yang-Mills theory in 3+1 dimensions on a two
dimensional transverse lattice using supersymmetric discrete light cone
quantization in the large-$N_c$ limit. This formulation is free of fermion
s... | hep-lat |
The Chiral Condensate of One-Flavor QCD and the Dirac Spectrum at
θ=0: In a sector of fixed topological charge, the chiral condensate has a
discontinuity given by the Banks-Casher formula also in the case of one-flavor
QCD. However, at fixed \theta-angle, the chiral condensate remains constant
when the quark mass cro... | hep-lat |
The strange quark contribution to the spin of the nucleon: Quark line disconnected matrix elements of an operator, such as the axial
current, are difficult to compute on the lattice. The standard method uses a
stochastic estimator of the operator, which is generally very noisy. We discuss
and develop further our altern... | hep-lat |
Spectrum of the open QCD flux tube and its effective string description: I perform a high precision measurement of the static quark-antiquark
potential in three-dimensional ${\rm SU}(N)$ gauge theory with $N=2$ to 6. The
results are compared to the effective string theory for the QCD flux tube and I
obtain continuum li... | hep-lat |
Nuclear force in Lattice QCD: We perform the quenched lattice QCD analysis on the nuclear force
(baryon-baryon interactions). We employ $20^3\times 24$ lattice at $\beta=5.7$
($a\simeq 0.19$ fm) with the standard gauge action and the Wilson quark action
with the hopping parameters $\kappa=0.1600, 0.1625, 0.1650$, and g... | hep-lat |
Two dimensional SU(N)xSU(N) Chiral Models on the Lattice (II): the
Green's Function: Analytical and numerical methods are applied to principal chiral models on a
two-dimensional lattice and their predictions are tested and compared. New
techniques for the strong coupling expansion of SU(N) models are developed and
ap... | hep-lat |
Effects of the anomaly on the QCD chiral phase transition: We study a lattice field theory described by two flavors of massless
staggered fermions interacting with U(1) gauge fields in the strong coupling
limit. We show that the lattice model has a $SU(2)\times SU(2)\times U(1)$
chiral symmetry and can be used to model... | hep-lat |
Running Coupling and the Lambda-Parameter from SU(3) Lattice Simulations: We present new results on the static qq-potential from high statistics
simulations on 32^4 and smaller lattices, using the standard Wilson beta = 6.0,
6.4, and 6.8. Within our statistical errors we do not observe any finite size
effects affecting... | hep-lat |
Domain Decomposition method on GPU cluster: Pallalel GPGPU computing for lattice QCD simulations has a bottleneck on the
GPU to GPU data communication due to the lack of the direct data exchanging
facility. In this work we investigate the performance of quark solver using the
restricted additive Schwarz (RAS) precondit... | hep-lat |
Deflated BiCGStab for linear equations in QCD problems: The large systems of complex linear equations that are generated in QCD
problems often have multiple right-hand sides (for multiple sources) and
multiple shifts (for multiple masses). Deflated GMRES methods have previously
been developed for solving multiple right... | hep-lat |
Electroweak three-body decays in the presence of two- and three-body
bound states: Recently, formalism has been derived for studying electroweak transition
amplitudes for three-body systems both in infinite and finite volumes. The
formalism provides exact relations that the infinite-volume amplitudes must
satisfy, as... | hep-lat |
One dimensional supersymmetric Yang-Mills theory with 16 supercharges: We report on numerical simulations of one dimensional maximally
supersymmetric SU(N) Yang-Mills theory, by using the lattice action with two
exact supercharges. Based on the gauge/gravity duality, the gauge theory
corresponds to N D0-branes system i... | hep-lat |
Confined Charged Particles in C-periodic Volumes: Charged particles in an Abelian Coulomb phase are non-local infraparticles
that are surrounded by a cloud of soft photons which extends to infinity.
Gauss' law prevents the existence of charged particles in a periodic volume. In
a $C$-periodic volume, which is periodic ... | hep-lat |
Toward solving the sign problem with path optimization method: We propose a new approach to circumvent the sign problem in which the
integration path is optimized to control the sign problem. We give a trial
function specifying the integration path in the complex plane and tune it to
optimize the cost function which re... | hep-lat |
Scaling studies of QCD with the dynamical HISQ action: We study the lattice spacing dependence, or scaling, of physical quantities
using the highly improved staggered quark (HISQ) action introduced by the
HPQCD/UKQCD collaboration, comparing our results to similar simulations with
the asqtad fermion action. Results are... | hep-lat |
Confinement-Deconfinement transition and $Z_2$ symmetry in $Z_2+$Higgs
theory: We study the Polyakov loop and the $Z_2$ symmetry in the lattice $Z_2+$Higgs
theory in 4D Euclidean space using Monte Carlo simulations. The results show
that this symmetry is realised in the Higgs symmetric phase for large number of
tempo... | hep-lat |
Proton decay matrix element on the lattice with physical pion mass: Proton decay is one of possible signatures of baryon number violation, which
has to exist to explain the baryon asymmetry and the existence of nuclear
matter. Proton decays must be mediated through effective low-energy baryon
number violating operators... | hep-lat |
Deriving exact results for Ising-like models from the cluster variation
method: The cluster variation method (CVM) is an approximation technique which
generalizes the mean field approximation and has been widely applied in the
last decades, mainly for finding accurate phase diagrams of Ising-like lattice
models. Here... | hep-lat |
Measurement of hybrid content of heavy quarkonia using lattice NRQCD: Using lowest-order lattice NRQCD to create heavy meson propagators and
applying the spin-dependent interaction, $c_B^{}
\frac{-g}{2m_q}\vec\sigma\cdot\vec{B}$, at varying intermediate time slices, we
compute the off-diagonal matrix element of the Ham... | hep-lat |
Pion form factor with twisted mass QCD: The pion form factor is calculated using quenched twisted mass QCD with
beta=6.0 and maximal twisting angle omega=pi/2. Two pion masses and several
values of momentum transfer are considered. The momentum averaging procedure of
Frezzotti and Rossi is used to reduce lattice spacin... | hep-lat |
Chiral Lattice Gauge Theories from Warped Domain Walls and
Ginsparg-Wilson Fermions: We propose a construction of a 2-dimensional lattice chiral gauge theory. The
construction may be viewed as a particular limit of an infinite warped
3-dimensional theory. We also present a "single-site'' construction using
Ginsparg-W... | hep-lat |
Logarithmic corrections to O($a$) and O($a^2$) effects in lattice QCD
with Wilson or Ginsparg-Wilson quarks: We derive the asymptotic lattice spacing dependence
$a^n[2b_0\bar{g}^2(1/a)]^{\hat{\Gamma}_i}$ relevant for spectral quantities of
lattice QCD, when using Wilson, O$(a)$ improved Wilson or Ginsparg-Wilson
quar... | hep-lat |
Exact calculation of disconnected loops: We present an implementation of the disconnected diagram contributions to
quantities such as the flavor-singlet pseudoscalar meson mass which are
accelerated by GPGPU technology utilizing the NVIDIA CUDA platform. To enable
the exact evaluation of the disconnected loops we use a... | hep-lat |
Light hadronic physics using domain wall fermions in quenched lattice
QCD: In the past year domain wall fermion simulations have moved from exploratory
stages to the point where systematic effects can be studied with different
gauge couplings, volumes, and lengths in the fifth dimension. Results are
presented here fo... | hep-lat |
Flux representation of an effective Polyakov loop model for QCD
thermodynamics: We discuss an effective Polyakov loop model for QCD thermodynamics with a
chemical potential. Using high temperature expansion techniques the partition
sum is mapped exactly onto the partition sum of a flux model. In the flux
representati... | hep-lat |
The beta function and equation of state for QCD with two flavors of
quarks: We measure the pressure and energy density of two flavor QCD in a wide range
of quark masses and temperatures. The pressure is obtained from an integral
over the average plaquette or psi-bar-psi. We measure the QCD beta function,
including th... | hep-lat |
A study of the (m,d,N)=(1,3,2) Lifshitz point and of the three-
dimensional XY universality class by high-temperature bivariate series for
the XY models with anisotropic competing interactions: High-temperature bivariate expansions have been derived for the two-spin
correlation-function in a variety of classical la... | hep-lat |
$ξ/ξ_{2nd}$ ratio as a tool to refine Effective Polyakov Loop models: Effective Polyakov line actions are a powerful tool to study the finite
temperature behaviour of lattice gauge theories. They are much simpler to
simulate than the original lattice model and are affected by a milder sign
problem, but it is not clear ... | hep-lat |
Numerical simulations with two flavours of twisted-mass Wilson quarks
and DBW2 gauge action: Discretisation errors in two-flavour lattice QCD with Wilson-quarks and DBW2
gauge action are investigated by comparing numerical simulation data at two
values of the bare gauge coupling. Both non-zero and zero twisted mass v... | hep-lat |
4d Simplicial Quantum Gravity: Matter Fields and the Corresponding
Effective Action: Four-dimensional simplicial quantum gravity is modified either by coupling it
to U(1) gauge fields or by introducing a measure weighted by the orders of the
triangles. Strong coupling expansion and Monte Carlo simulations are used.
A... | hep-lat |
Magnetic polarizability of hadrons from lattice QCD: We extract the magnetic polarizability from the quadratic response of a
hadron's mass shift in progressively small static magnetic fields. The
calculation is done on a 24x12x12x24 lattice at a = 0.17 fm with an improved
gauge action and the clover quark action. The r... | hep-lat |
Curvature of the pseudocritical line in (2+1)-flavor QCD with HISQ
fermions: We study QCD with (2+1)-HISQ fermions at nonzero temperature and nonzero
imaginary baryon chemical potential. Monte Carlo simulations are performed
using the MILC code along the line of constant physics with a light to strange
mass ratio of ... | hep-lat |
Bosonic color-flavor transformation for the special unitary group: We extend Zirnbauer's color-flavor transformation in the bosonic sector to
the color group SU(N_c). Because the flavor group U(N_b, N_b) is non-compact,
the algebraic method by which the original color-flavor transformation was
derived leads to a useful... | hep-lat |
Charged Pion Polarizability from the Lattice: Direct evaluation of charged particle polarizabilities on the lattice is
quite difficult. However, a short cut for charged pion polarizability - the
Das, Mathur, Okubo Sum Rule - can readily be calculated using lattice
techniques. A phenomenological model has been developed... | hep-lat |
Chiral condensate from the Banks-Casher relation: We report on our ongoing project of determining the chiral condensate of
two-flavor QCD from the Banks-Casher relation. We compute the mode number of
the O(a)-improved Wilson-Dirac operator for several values of \Lambda, and we
discuss different fitting strategies to ex... | hep-lat |
Thermal Correlators in the ρ channel of two-flavor QCD: We present a lattice QCD calculation with two dynamical flavors of the
isovector vector correlator in the high-temperature phase. We analyze the
correlator in terms of the associated spectral function, for which we review
the theoretical expectations. In our main ... | hep-lat |
Power corrections from decoupling of the charm quark: Decoupling of heavy quarks at low energies can be described by means of an
effective theory as shown by S. Weinberg in Ref. [1]. We study the decoupling
of the charm quark by lattice simulations. We simulate a model, QCD with two
degenerate charm quarks. In this cas... | hep-lat |
$d^\ast (2380)$ dibaryon from lattice QCD: The $\Delta\Delta$ dibaryon resonance $d^\ast (2380)$ with $(J^P, I)=(3^+,
0)$ is studied theoretically on the basis of the 3-flavor lattice QCD
simulation with heavy pion masses ($m_\pi =679, 841$ and $1018$ MeV). By using
the HAL QCD method, the central $\Delta$-$\Delta$ pot... | hep-lat |
Dilaton EFT from p-regime to RMT in the $ε$-regime: New results are reported from tests of a low-energy effective field theory
(EFT) that includes a dilaton field to describe the emergent light scalar with
${ 0^{++} }$ quantum numbers in the strongly coupled near-conformal gauge
theory with a massless fermion flavor do... | hep-lat |
Quark propagator from an improved staggered action in Laplacian and
Landau gauges: Studies of gauge dependent quantities are afflicted with Gribov copies, but
Laplacian gauge fixing provides one possible solution to this problem. We
present results for the lattice quark propagator in both Landau and Laplacian
gauges ... | hep-lat |
SPHERICALLY SYMMETRIC RANDOM WALKS III. POLYMER ADSORPTION AT A
HYPERSPHERICAL BOUNDARY: A recently developed model of random walks on a $D$-dimensional
hyperspherical lattice, where $D$ is {\sl not} restricted to integer values, is
used to study polymer growth near a $D$-dimensional attractive hyperspherical
boundar... | hep-lat |
Some exact results on the QCD critical point: We show, in a model-independent manner, that the QCD critical point can
appear only inside the pion condensation phase of the phase-quenched QCD as
long as the contribution of flavor-disconnected diagrams is negligible. The
sign problem is known to be maximally severe in th... | hep-lat |
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