abstract stringlengths 3 192k | title stringlengths 4 857 |
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we present a new understanding of the unstable ghostlike resonance which appears in theories such as quadratic gravity and lee-wick type theories. quantum corrections make this resonance unstable, such that it does not appear in the asymptotic spectrum. we prove that these theories are unitary to all orders. unitarity ... | unitarity, stability, and loops of unstable ghosts |
in holographic theories, the reflected entropy has been shown to be dual to the area of the entanglement wedge cross section. we study the same problem in random tensor networks demonstrating an equivalent duality. for a single random tensor we analyze the important non-perturbative effects that smooth out the disconti... | reflected entropy in random tensor networks |
we analyze gw150914 postmerger data to understand if ringdown overtone detection claims are robust. we find no evidence in favor of an overtone in the data after the waveform peak. around the peak, the bayes factor does not indicate the presence of an overtone, while the support for a nonzero amplitude is sensitive to ... | analysis of ringdown overtones in gw150914 |
in the tetrad formulation of gravity, the so-called simplicity constraints play a central role. they appear in the hamiltonian analysis of the theory, and in the lagrangian path integral when constructing the gravity partition function from topological bf theory. we develop here a systematic analysis of the corner symp... | edge modes of gravity. part iii. corner simplicity constraints |
in recent years there has been a growing interest in the field of casimir wormhole. in classical general relativity (gr), it is known that the null energy condition (nec) has to be violated to have a wormhole to be stable. the casimir effect is an experimentally verified effect that is caused due to the vacuum field fl... | casimir wormholes in modified symmetric teleparallel gravity |
relativistic quantum systems that admit scattering experiments are quantitatively described by effective field theories, where s-matrix kinematics and symmetry considerations are encoded in the operator spectrum of the eft. in this paper we use the s-matrix to derive the structure of the eft operator basis, providing c... | operator bases, s-matrices, and their partition functions |
the stability conditions of a relativistic hydrodynamic theory can be derived directly from the requirement that the entropy should be maximized in equilibrium. here, we use a simple geometrical argument to prove that, if the hydrodynamic theory is stable according to this entropic criterion, then localized perturbatio... | thermodynamic stability implies causality |
making the lorentzian path integral for quantum gravity well-defined and computable has been a long standing challenge. in this work we adopt the recently proposed effective spin foam models to the lorentzian case. this defines a path integral over discrete lorentzian quantum geometric configurations, which include met... | effective spin foam models for lorentzian quantum gravity |
tensor network methods are taking a central role in modern quantum physics and beyond. they can provide an efficient approximation to certain classes of quantum states, and the associated graphical language makes it easy to describe and pictorially reason about quantum circuits, channels, protocols, open systems and mo... | tensor networks in a nutshell |
this paper expands on two recent proposals, [12, 13] and [14], for generalizing the ryu-takayanagi and hubeny-rangamani-takayanagi formulas to de sitter space. the proposals (called the monolayer and bilayer proposals) are similar; both replace the boundary of ads by the boundaries of static-patches — in other words ev... | entanglement in de sitter space |
we find new exact analytical solutions in three-dimensional gravity applying the minimal geometric deformation approach in a cloud of strings. | minimal geometric deformation in a cloud of strings |
in a theory of quantum gravity, states can be represented as wavefunctionals that assign an amplitude to a given configuration of matter fields and the metric on a spatial slice. these wavefunctionals must obey a set of constraints as a consequence of the diffeomorphism invariance of the theory, the most important of w... | holography from the wheeler-dewitt equation |
we study fixed points of quantum gravity with renormalization group methods and a procedure to remove convergence-limiting poles from the flow. the setup is tested within the f (r ) approximation for gravity by solving exact recursive relations up to order r70 in the ricci scalar, combined with resummations and numeric... | aspects of asymptotic safety for quantum gravity |
the purpose of this paper is to obtain exact solutions for charged anisotropic spherically symmetric matter configuration. for this purpose, we consider known solution for isotropic spherical system in the presence of electromagnetic field and extend it to two types of anisotropic charged solutions through gravitationa... | gravitational decoupled charged anisotropic spherical solutions |
by leveraging shared entanglement between a pair of qubits, one can teleport a quantum state from one particle to another. recent advances have uncovered an intrinsically many-body generalization of quantum teleportation, with an elegant and surprising connection to gravity. in particular, the teleportation of quantum ... | many-body quantum teleportation via operator spreading in the traversable wormhole protocol |
the double copy is a map from non-abelian gauge theories to gravity, that has been demonstrated both for scattering amplitudes and exact classical solutions. in this study, we reconsider the double copy for exact solutions that are self-dual in either the gauge or gravity theory. in this case, one may formulate a gener... | the self-dual classical double copy, and the eguchi-hanson instanton |
we study the concept of carrollian spacetime starting from its underlying fiber-bundle structure. the latter admits an ehresmann connection, which enables a natural separation of time and space, preserved by the subset of carrollian diffeomorphisms. these allow for the definition of carrollian tensors and the structure... | carroll structures, null geometry, and conformal isometries |
new structural properties of post-minkowskian (pm) gravity are derived, notably within its effective one body (eob) formulation. our results concern both the mass dependence, and the high-energy behavior, of the classical scattering angle. we generalize our previous work by deriving, up to the fourth post-minkowskian (... | classical and quantum scattering in post-minkowskian gravity |
if gravitational perturbations are quantized into gravitons in analogy with the electromagnetic field and photons, the resulting graviton interactions should lead to an entangling interaction between massive objects. we suggest a test of this prediction. to do this, we introduce the concept of interactive quantum infor... | using an atom interferometer to infer gravitational entanglement generation |
we apply the gauss-bonnet theorem to the study of light rays in a plasma medium in a static and spherically symmetric gravitational field and also to the study of timelike geodesics followed for test massive particles in a spacetime with the same symmetries. the possibility of using the theorem follows from a correspon... | weak lensing in a plasma medium and gravitational deflection of massive particles using the gauss-bonnet theorem. a unified treatment |
we systematically explore the space of scalar effective field theories (efts) consistent with a lorentz invariant and local s-matrix. to do so we define an eft classification based on four parameters characterizing 1) the number of derivatives per interaction, 2) the soft properties of amplitudes, 3) the leading valenc... | a periodic table of effective field theories |
we study the asymptotic safety conjecture for quantum gravity in the presence of matter fields. a general line of reasoning is put forward explaining why gravitons dominate the high-energy behavior, largely independently of the matter fields as long as these remain sufficiently weakly coupled. our considerations are pu... | asymptotic safety of gravity with matter |
carrollian holography aims to express gravity in four-dimensional asymptotically flat spacetime in terms of a dual three-dimensional carrollian cft living at null infinity. carrollian amplitudes are massless scattering amplitudes written in terms of asymptotic or null data at $\mathscr i$. these position space amplitud... | carrollian amplitudes and celestial symmetries |
we investigate cosmological correlators for conformally coupled $\phi^4$ theory in four-dimensional de sitter space. these \textit{in-in} correlators differ from scattering amplitudes for massless particles in flat space due to the spacelike structure of future infinity in de sitter. they also require a regularization ... | the subtle simplicity of cosmological correlators |
we have previously shown (arxiv:1912.00033) that three approaches to relational quantum dynamics -- relational dirac observables, the page-wootters formalism and quantum deparametrizations -- are equivalent. here we show that this `trinity' of relational quantum dynamics holds in relativistic settings per frequency sup... | equivalence of approaches to relational quantum dynamics in relativistic settings |
in this paper we will study lorentz-invariant, infinite derivative quantum field theories, where infinite derivatives give rise to non-local interactions at the energy scale ms, beyond the standard model. we will study a specific class, where there are no new dynamical degrees of freedom other than the original ones of... | ghost-free infinite derivative quantum field theory |
the sachdev-ye-kitaev (syk) model is a strongly coupled, quantum many-body system that is chaotic, nearly conformally invariant, and exactly solvable. this remarkable and, to date, unique combination of properties have driven the intense activity surrounding the syk model and its applications within both high energy an... | an introduction to the syk model |
in this paper, we study the krylov complexity in quantum field theory and make a connection with the holographic "complexity equals volume" conjecture. when krylov basis matches with fock basis, for several interesting settings, we observe that the krylov complexity equals the average particle number showing that compl... | krylov complexity in quantum field theory |
we study two-dimensional celestial conformal field theory describing four- dimensional n =1 supergravity/yang-mills systems and show that the underlying symmetry is a supersymmetric generalization of bms symmetry. we construct fermionic conformal primary wave functions and show how they are related via supersymmetry to... | extended super bms algebra of celestial cft |
within an effective field theory method to general relativity, we calculate the fifth-order post-newtonian (5pn) hamiltonian dynamics also for the tail terms, extending earlier work on the potential contributions, working in harmonic coordinates. here we calculate independently all (local) 5pn far-zone contributions us... | the fifth-order post-newtonian hamiltonian dynamics of two-body systems from an effective field theory approach |
we present the first direct and non-perturbative computation of the graviton spectral function in quantum gravity. this is achieved with the help of a novel lorentzian renormalisation group approach, combined with a spectral representation of correlation functions. we find a positive graviton spectral function, showing... | lorentzian quantum gravity and the graviton spectral function |
we resolve the issue of infrared divergences present in theories of light scalar fields on de sitter space. | $\\lambda \\phi^4$ in ds |
cluster and hypernuclei production in heavy-ion collisions is presently under active experimental and theoretical investigation. since clusters are weekly bound objects, their production is very sensitive to the dynamical evolution of the system and its interactions. the theoretical description of cluster formation is ... | parton-hadron-quantum-molecular dynamics: a novel microscopic n -body transport approach for heavy-ion collisions, dynamical cluster formation, and hypernuclei production |
ukrmol+ is a new implementation of the time-independent uk r-matrix electron-molecule scattering code. key features of the implementation are the use of quantum chemistry codes such as molpro to provide target molecular orbitals; the optional use of mixed gaussian - b-spline basis functions to represent the continuum a... | ukrmol+: a suite for modelling electronic processes in molecules interacting with electrons, positrons and photons using the r-matrix method |
quantum mechanics has irked physicists ever since its conception more than 100 years ago. while some of the misgivings, such as it being unintuitive, are merely aesthetic, quantum mechanics has one serious shortcoming: it lacks a physical description of the measurement process. this ``measurement problem'' indicates th... | rethinking superdeterminism |
the concept of effective dynamics has proven successful in lqc, a loop-inspired quantization of cosmological spacetimes. we apply the same idea of its derivation in lqc to the full theory, by computing the expectation value of the scalar constraint with respect to some coherent states peaked on the phase-space variable... | cosmological effective hamiltonian from full loop quantum gravity dynamics |
the self-force expansion allows the study of deviations from geodesic motion due to the emission of radiation and its consequent back-reaction. we investigate this scheme within the on-shell framework of semiclassical scattering amplitudes for particles emitting photons or gravitons on a static, spherically symmetric b... | scattering amplitudes for self-force |
we reformulate the recently proposed regularized version of lovelock gravity in four dimensions as a scalar-tensor theory. by promoting the warp factor of the internal space to a scalar degree of freedom by means of kaluza-klein reduction, we show that regularized lovelock gravity can be described effectively by a cert... | effective scalar-tensor description of regularized lovelock gravity in four dimensions |
we present a new derivation of israel-stewart-like relativistic second-order dissipative spin hydrodynamic equations using the entropy current approach. in our analysis, we consider a general energy-momentum tensor with symmetric and antisymmetric parts. moreover, the spin tensor, which is not separately conserved, has... | relativistic second-order spin hydrodynamics: an entropy-current analysis |
we study the topological defects in the thermodynamics of regular black strings (from a four-dimensional perspective) that is symmetric under the double wick rotation and constructed in the high-dimensional spacetime with an extra dimension compactified on a circle. we observe that the thermodynamic phases of regular b... | topology in thermodynamics of regular black strings with kaluza-klein reduction |
we show that the widely used relaxation time approximation to the relativistic boltzmann equation contains basic flaws, being incompatible with micro- and macroscopic conservation laws if the relaxation time depends on energy or general matching conditions are applied. we propose a new approximation that fixes such fun... | novel relaxation time approximation to the relativistic boltzmann equation |
we propose a new theory of second-order viscous relativistic hydrodynamics which does not impose any frame conditions on the choice of the hydrodynamic variables. it differs from mueller-israel-stewart theory by including additional transient degrees of freedom, and its first-order truncation reduces to bemfica-disconz... | transient relativistic fluid dynamics in a general hydrodynamic frame |
we compute the static contribution to the gravitational interaction potential of two point masses in the velocity-independent five-loop (and 5th post-newtonian) approximation to the harmonic coordinates effective action in a direct calculation. the computation is performed using effective field methods based on feynman... | five-loop static contribution to the gravitational interaction potential of two point masses |
light fields carrying orbital angular momentum (oam) provide powerful capabilities for applications in optical communications, microscopy, quantum optics, and microparticle manipulation. we introduce a property of light beams, manifested as a temporal oam variation along a pulse: the self-torque of light. although self... | generation of extreme-ultraviolet beams with time-varying orbital angular momentum |
as time passes, once simple quantum states tend to become more complex. for strongly coupled k -local hamiltonians, this growth of computational complexity has been conjectured to follow a distinctive and universal pattern. in this paper we show that the same pattern is exhibited by a much simpler system—classical geod... | quantum complexity and negative curvature |
we extend the perturbative classical double copy to the analysis of bound systems. we first obtain the leading order perturbative gluon radiation field sourced by a system of interacting color charges in arbitrary time dependent orbits, and test its validity by taking relativistic bremsstrahlung and nonrelativistic bou... | bound states and the classical double copy |
the phase space of general relativity in a finite subregion is characterized by edge modes localized at the codimension-2 boundary, transforming under an infinite-dimensional group of symmetries. the quantization of this symmetry algebra is conjectured to be an important aspect of quantum gravity. as a step towards qua... | gravitational edge modes, coadjoint orbits, and hydrodynamics |
unitarity of time evolution is one of the basic principles constraining physical processes. its consequences in the perturbative bunch-davies wavefunction in cosmology have been formulated in terms of the cosmological optical theorem. in this paper, we re-analyse perturbative unitarity for the bunch-davies wavefunction... | perturbative unitarity and the wavefunction of the universe |
the superposition principle is the cornerstone of quantum mechanics, leading to a variety of genuinely quantum effects. whether the principle applies also to macroscopic systems or, instead, there is a progressive breakdown when moving to larger scales is a fundamental and still open question. spontaneous wavefunction ... | present status and future challenges of non-interferometric tests of collapse models |
we compute the potential-photon contributions to the classical relativistic scattering angle of two charged non-spinning bodies in electrodynamics through fifth order in the coupling. we use the scattering amplitudes framework, effective field theory, and multi-loop integration techniques based on integration by parts ... | conservative binary dynamics at order $o(\\alpha^5)$ in electrodynamics |
we prove global existence for einstein's equations with a charged scalar field for initial conditions sufficiently close to the minkowski spacetime without matter. the proof relies on generalized wave coordinates adapted to the outgoing schwarzschild light cones and the estimates for the massless maxwell-klein-gordon s... | global stability of minkowski space for the einstein–maxwell–klein–gordon system in generalized wave coordinates |
we study the validity of positivity bounds in the presence of a massless graviton, assuming the regge behavior of the amplitude. under this assumption, the problematic t-channel pole is canceled with the uv integral of the imaginary part of the amplitude in the dispersion relation, which gives rise to finite correction... | gravitational positivity bounds |
in the literature, there are many discussions about the local lorentz invariance of modified teleparallel gravity. this symmetry is obviously violated in the classical “pure tetrad” formulation of the theory, while it gets restored in the “fully covariant” approach. my claim is that, despite many heated discussions, th... | the geometrical meaning of the weitzenböck connection |
quantum state discrimination underlies various applications in quantum information processing tasks. it essentially describes the distinguishability of quantum systems in different states, and the general process of extracting classical information from quantum systems. it is also useful in quantum information applicat... | quantum state discrimination and its applications |
we prove the quantum null energy condition (qnec), a lower bound on the stress tensor in terms of the second variation in a null direction of the entropy of a region. the qnec arose previously as a consequence of the quantum focusing conjecture, a proposal about quantum gravity. the qnec itself does not involve gravity... | proof of the quantum null energy condition |
we review recent developments on nonrelativistic string theory. in flat spacetime, the theory is defined by a two-dimensional relativistic quantum field theory with nonrelativistic global symmetries acting on the worldsheet fields. this theory arises as a self-contained corner of relativistic string theory. it has a st... | aspects of nonrelativistic strings |
in this paper we extract from a large-$r$ expansion of the vacuum einstein's equations a dynamical system governing the time evolution of an infinity of higher-spin charges. upon integration, we evaluate the canonical action of these charges on the gravity phase space. the truncation of this action to quadratic order a... | higher spin dynamics in gravity and $w_{1 + \\infty}$ celestial symmetries |
in the asymptotic safety paradigm, a quantum field theory reaches a regime with quantum scale invariance in the ultraviolet, which is described by an interacting fixed point of the renormalization group. compelling hints for the viability of asymptotic safety in quantum gravity exist, mainly obtained from applications ... | status of the asymptotic safety paradigm for quantum gravity and matter |
the first measurements of anisotropic flow coefficients vn for mid-rapidity charged particles in xe-xe collisions at √{snn } = 5.44 tev are presented. comparing these measurements to those from pb-pb collisions at √{snn } = 5.02 tev, v2 is found to be suppressed for mid-central collisions at the same centrality, and en... | anisotropic flow in xe-xe collisions at √{snn } = 5.44 tev |
in this paper, we demonstrate the emergence of nonlinear gravitational equations directly from the physics of a broad class of conformal field theories. we consider cft excited states defined by adding sources for scalar primary or stress tensor operators to the euclidean path integral defining the vacuum state. for th... | nonlinear gravity from entanglement in conformal field theories |
the starting point of this work is the original einstein action, sometimes called the gamma squared action. continuing from our previous results, we study various modified theories of gravity following the palatini approach. the metric and the connection will be treated as independent variables leading to generalized t... | modified gravity: a unified approach to metric-affine models |
we propose a new duality relation between codimension-two space-like surfaces in gravitational theories and quantum states in dual hilbert spaces. this surface/state correspondence largely generalizes the idea of holography such that we do not need to rely on the existence of boundaries in gravitational spacetimes. the... | surface/state correspondence as a generalized holography |
we perform a detailed study of a class of irregular correlators in liouville conformal field theory, of the related virasoro conformal blocks with irregular singularities and of their connection formulae. upon considering their semi-classical limit, we provide explicit expressions of the connection matrices for the heu... | irregular liouville correlators and connection formulae for heun functions |
eikonal exponentiation in qft describes the emergence of classical physics at long distances in terms of a non-trivial resummation of infinitely many diagrams. long ago, 't~hooft proposed a beautiful correspondence between ultra-relativistic scalar eikonal scattering and one-to-one scattering in a background shockwave ... | eikonal amplitudes from curved backgrounds |
these lecture notes provide an overview of different aspects of de sitter space and their plausible holographic interpretations. we start with a general description of the classical spacetime. we note the existence of a cosmological horizon and its associated thermodynamic quantities, such as the gibbons-hawking entrop... | modave lectures on de sitter space & holography |
we present a detailed analysis of gravity in a partial bondi gauge, where only the three conditions g_{rr}=0=g_{ra}grr=0=gra are fixed. we relax in particular the so-called determinant condition on the transverse metric, which is only assumed to admit a polyhomogeneous radial expansion. this is sufficient in order to b... | the partial bondi gauge: further enlarging the asymptotic structure of gravity |
these lectures review recent developments in our understanding of the emergence of local bulk physics in ads/cft. the primary topics are sufficient conditions for a conformal field theory to have a semiclassical dual, bulk reconstruction, the quantum error correction interpretation of the correspondence, tensor network... | tasi lectures on the emergence of the bulk in ads/cft |
carrollian conformal field theories (carrollian cfts) are natural field theories on null infinity of an asymptotically flat spacetime or, more generally, geometries with conformal carrollian structure. using a basis transformation, gravitational s-matrix elements can be brought into the form of correlators of a carroll... | an embedding space approach to carrollian cft correlators for flat space holography |
the aim of this paper is to introduce a new modified gravity theory named f(g,t) gravity (g and t are the gauss-bonnet invariant and trace of the energy-momentum tensor, respectively) and investigate energy conditions for two reconstructed models in the context of frw universe. we formulate general field equations, div... | energy conditions in f(g,t) gravity |
considering a doubly holographic model, we study the evolution of holographic subregion complexity corresponding to deformations of the bath state by a relevant scalar operator, which corresponds to a renormalization group flow from the anti-de sitter-schwarzschild to the kasner universe in the bulk. the subregion comp... | bath deformations, islands, and holographic complexity |
scattering amplitudes have their origin in quantum field theory, but have wide-ranging applications extending to classical physics. we review a formalism to connect certain classical observables to scattering amplitudes. an advantage of this formalism is that it enables us to study implications of the double copy in cl... | the sagex review on scattering amplitudes, chapter 14: classical gravity from scattering amplitudes |
in spite of decades of work it has remained unclear whether or not superradiant quantum phases, referred to here as photon condensates, can occur in equilibrium. in this rapid communication, we first show that when a nonrelativistic quantum many-body system is coupled to a cavity field, gauge invariance forbids photon ... | cavity quantum electrodynamics of strongly correlated electron systems: a no-go theorem for photon condensation |
the double copy suggests that the basis of the dynamics of general relativity is yang-mills theory. motivated by the importance of the relativistic two-body problem, we study the classical dynamics of colour-charged particle scattering from the perspective of amplitudes, rather than equations of motion. we explain how ... | classical yang-mills observables from amplitudes |
celestial holography provides a reformulation of scattering amplitudes in four dimensional asymptotically flat spacetimes in terms of conformal correlators of operators on the two dimensional celestial sphere in a basis of boost eigenstates. a basis of {massless particle} states has previously been identified in terms ... | a discrete basis for celestial holography |
we review recent progress in developing effective field theories (efts) for non-equilibrium processes at finite temperature, including a new formulation of fluctuating hydrodynamics, and a new proof of the second law of thermodynamics. there are a number of new elements in formulating efts for such systems. firstly, th... | lectures on non-equilibrium effective field theories and fluctuating hydrodynamics |
in this paper we study various dynamical aspects of the ads/bcft correspondence in higher dimensions. we study properties of holographic stress energy tensor by analyzing the metric perturbation in the gravity dual. we also calculate the stress energy tensor for a locally excited state on a half plane in a free scalar ... | brane dynamics of holographic bcfts |
the classical double copy relates solutions of biadjoint, gauge, and gravity theories. the ultimate origin and scope of this correspondence remains mysterious, such that it is important to build a clear physical intuition of how the double copy operates. to this end, we consider the multipole expansion of exact classic... | double copy of the multipole expansion |
we determine the gravitational interaction between two compact bodies up to the sixth power in newton's constant, gn, in the static limit. this result is achieved within the effective field theory approach to general relativity, and exploits a manifest factorization property of static diagrams which allows us to derive... | static two-body potential at fifth post-newtonian order |
we analyze the harvesting of entanglement and classical correlations from the quantum vacuum to particle detectors. we assess the impact on the detectors' harvesting ability of the spacetime dimensionality, the suddenness of the detectors' switching, their physical size and their internal energy structure. our study re... | harvesting correlations from the quantum vacuum |
we study the minimal geometric deformation decoupling in 2+1 dimensional space-times and implement it as a tool for obtaining anisotropic solutions from isotropic geometries. interestingly, both the isotropic and the anisotropic sector fulfill einstein field equations in contrast to the cases studied in 3+1 dimensions.... | minimal geometric deformation decoupling in 2+1 dimensional space-times |
phase compensated optical fiber links enable high accuracy atomic clocks separated by thousands of kilometers to be compared with unprecedented statistical resolution. by searching for a daily variation of the frequency difference between four strontium optical lattice clocks in different locations throughout europe co... | test of special relativity using a fiber network of optical clocks |
we consider a generalized uncertainty principle (gup) corresponding to a deformation of the fundamental commutator obtained by adding a term quadratic in the momentum. from this gup, we compute corrections to the unruh effect and related unruh temperature, by first following a heuristic derivation, and then a more stan... | modified unruh effect from generalized uncertainty principle |
weinberg's asymptotic safety scenario provides an elegant mechanism to construct a quantum theory of gravity within the framework of quantum field theory based on a non-gaussian fixed point of the renormalization group flow. in this work we report novel evidence for the validity of this scenario, using functional renor... | gravitational two-loop counterterm is asymptotically safe |
some recently proposed definitions of jackiw-teitelboim (jt) gravity and supergravities in terms of combinations of minimal string models are explored, with a focus on physics beyond the perturbative expansion in spacetime topology. while this formally involves solving infinite-order nonlinear differential equations, i... | explorations of nonperturbative jackiw-teitelboim gravity and supergravity |
nonrelativistic string theory is a unitary, ultraviolet finite quantum gravity theory with a nonrelativistic string spectrum. the vertex operators of the worldsheet theory determine the spacetime geometry of nonrelativistic string theory, known as the string newton-cartan geometry. we compute the weyl anomaly of the no... | nonrelativistic string theory in background fields |
there are some gravitational theories in which the ordinary energy-momentum conservation law is not valid in the curved spacetime. rastall gravity is one of the known theories in this regard which includes a non-minimal coupling between geometry and matter fields. equipped with the basis of such theory, we study the pr... | traversable asymptotically flat wormholes in rastall gravity |
casimir energy is always indicated as a potential source to generate a traversable wormhole. it is also used to prove the existence of negative energy which can be built in the laboratory. however, in the scientific literature there is no trace of the consequences on the traversable wormhole itself. in this work, we wo... | casimir wormholes |
in this contribution, we discuss the asymptotic safety scenario for quantum gravity by evaluating the correlation functions of dynamical metric fluctuations. this is done with a functional renormalisation group approach that disentangles dynamical metric fluctuations from the background metric. we detail the derivation... | quantum gravity from dynamical metric fluctuations |
we present a complete basis to study gauged curvature-squared supergravity in five dimensions. we replace the conventional ungauged riemann-squared action with a new log invariant, offering a comprehensive framework for all gauged curvature-squared supergravities. our findings address long-standing challenges and have ... | all gauged curvature-squared supergravities in five dimensions |
the construction of amplitudes on curved space-times is a major challenge, particularly when the background has non-constant curvature. we give formulae for all tree-level graviton scattering amplitudes in curved self-dual (sd) radiative space-times; these are chiral, source-free, asymptotically flat spaces determined ... | graviton scattering in self-dual radiative space-times |
we derive the cutkosky rules for conformal field theories (cfts) at weak and strong coupling. these rules give a simple, diagrammatic method to compute the double-commutator that appears in the lorentzian inversion formula. we first revisit weakly-coupled cfts in flat space, where the cuts are performed on feynman diag... | cft unitarity and the ads cutkosky rules |
we discuss general momentum-dependent field redefinitions in the context of quantum-gravitational scattering amplitudes in general, and asymptotic safety in particular. implementing such redefinitions at the lowest curvature order, we can bring the graviton propagator into tree-level form, avoiding issues of fiducial g... | momentum-dependent field redefinitions in asymptotic safety |
we explicitly establish the equivalence between the magnetic carrollian limit of einstein gravity defined through the hamiltonian formalism and the carrollian theory of gravity defined through a gauging of the carroll algebra along the lines of standard poincaré (or (a)ds) gaugings. | magnetic carrollian gravity from the carroll algebra |
the gravitational asymptotic safety program envisions a high-energy completion of gravity based on a non-gaussian renormalization group fixed point. a key step in this program is the transition from euclidean to lorentzian signature spacetimes. one way to address this challenge is to formulate the quantum theory based ... | foliated asymptotically safe gravity in the fluctuation approach |
in this study of the modified theory of gravity in the spatially flat friedmann–lemaître–robertson–walker (flrw) spacetime, all the affine connections compatible with the symmetric teleparallel structure are explored; three classes of such connections exist, each involving an unknown time‑varying parameter . assuming o... | how different connections in flat flrw geometry impact energy conditions in f(q)f(q) theory? |
scattering amplitudes have their origin in quantum field theory, but have wide-ranging applications extending to classical physics. we review a formalism to connect certain classical observables to scattering amplitudes. an advantage of this formalism is that it enables us to study implications of the double copy in cl... | the sagex review on scattering amplitudes chapter 14: classical gravity from scattering amplitudes |
causality is necessary for retarded green's functions to remain retarded in all inertial frames in relativity, which ensures that dissipation of fluctuations is a lorentz invariant concept. for first-order bemfica, disconzi, noronha, and kovtun theories with stochastic fluctuations, introduced via the schwinger-keldysh... | relativistic hydrodynamic fluctuations from an effective action: causality, stability, and the information current |
we study stress tensor correlation functions in four-dimensional conformal field theories with large n and a sparse spectrum. theories in this class are expected to have local holographic duals, so effective field theory in anti-de sitter suggests that the stress tensor sector should exhibit universal, gravity-like beh... | einstein gravity 3-point functions from conformal field theory |
we study renyi entropies snin quantum error correcting codes and compare the answer to the cosmic brane prescription for computing {\tilde{s}}_n≡ {n}^2{partial}_n(n-1/n{s}_n) . we find that general operator algebra codes have a similar, more general prescription. notably, for the ads/cft code to match the specific cosm... | holographic renyi entropy from quantum error correction |
symmetric teleparallel gravity theories, in which the gravitational interaction is attributed to the nonmetricity of a flat, symmetric, but not metric-compatible affine connection, have been a topic of growing interest in recent studies. numerous works study the cosmology of symmetric teleparallel gravity assuming a fl... | general covariant symmetric teleparallel cosmology |
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