abstract stringlengths 3 192k | title stringlengths 4 857 |
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advances in quantum technologies are giving rise to a revolution in the way fundamental physics questions are explored at the empirical level. at the same time, they are the seeds for future disruptive technological applications of quantum physics. remarkably, a space-based environment may open many new avenues for exp... | quantum physics in space |
this work is focused on the study of analytic anisotropic solutions to einstein's field equations, describing spherically symmetric and static configurations by way of the gravitational decoupling through the method of minimal geometric deformation (mgd). for this we apply mgd to heintzmann's solution obtaining two new... | a new family of analytical anisotropic solutions by gravitational decoupling |
we study jackiw-teitelboim gravity with dynamical end of the world branes in asymptotically nearly ads2 spacetimes. we quantize this theory in lorentz signature, and compute the euclidean path integral summing over topologies including dynamical branes. the latter will be seen to exactly match with a modification of th... | an effective matrix model for dynamical end of the world branes in jackiw-teitelboim gravity |
the recently developed worldline quantum field theory (wqft) formalism for the classical gravitational scattering of massive bodies is extended to massive, charged point particles coupling to biadjoint scalar field theory, yang-mills theory, and dilaton-gravity theory. we establish a classical double copy relation in t... | classical double copy of worldline quantum field theory |
we classify condensed matter systems in terms of the spacetime symmetries they spontaneously break. in particular, we characterize condensed matter itself as any state in a poincaré-invariant theory that spontaneously breaks lorentz boosts while preserving at large distances some form of spatial translations, time-tran... | zoology of condensed matter: framids, ordinary stuff, extra-ordinary stuff |
it is proposed that a family of jackiw-teitelboim supergravites, recently discussed in connection with matrix models by stanford and witten, can be given a complete definition, to all orders in the topological expansion and beyond, in terms of a specific combination of minimal string theories. this construction defines... | jackiw-teitelboim supergravity, minimal strings, and matrix models |
asymptotic safety generalizes asymptotic freedom and could contribute to understanding physics beyond the standard model. it is a candidate scenario to provide an ultraviolet extension for the effective quantum field theory of gravity through an interacting fixed point of the renormalization group. recently, asymptotic... | an asymptotically safe guide to quantum gravity and matter |
in this paper, we investigate ads/bcft for curvature-squared gravity. to warm up, we start with gauss-bonnet gravity. we derive the one point function of stress tensor and show that the central charge related to the norm of displacement operator is positive for the couplings obeying causality constraints. furthermore, ... | ads/bcft and island for curvature-squared gravity |
we show how quantum many-body systems on hyperbolic lattices with nearest-neighbor hopping and local interactions can be mapped onto quantum field theories in continuous negatively curved space. the underlying lattices have recently been realized experimentally with superconducting resonators and therefore allow for a ... | quantum simulation of hyperbolic space with circuit quantum electrodynamics: from graphs to geometry |
we show that the spectrum of the syk model can be interpreted as that of a 3d scalar coupled to gravity. the scalar has a mass which is at the breitenholer-freedman bound of ads2, and subject to a delta function potential at the center of the interval along the third direction. this, through kaluza-klein procedure on a... | three dimensional view of the syk/ads duality |
this paper summarises the theory and functionality behind questaal, an open-source suite of codes for calculating the electronic structure and related properties of materials from first principles. the formalism of the linearised muffin-tin orbital (lmto) method is revisited in detail and developed further by the intro... | questaal: a package of electronic structure methods based on the linear muffin-tin orbital technique |
we propose defect extremal surface as the holographic counterpart of boundary quantum extremal surface. the defect extremal surface is defined by minimizing the ryu-takayanagi surface corrected by the defect theory. this is particularly interesting when the rt surface crosses or terminates on the defect. in a simple se... | defect extremal surface as the holographic counterpart of island formula |
we discover that asymptotically safe quantum gravity could predict the top-quark mass. for a broad range of microscopic gravitational couplings, quantum gravity could provide an ultraviolet completion for the standard model by triggering asymptotic freedom in the gauge couplings and bottom yukawa and asymptotic safety ... | top mass from asymptotic safety |
we discuss aspects of non-perturbative unitarity in quantum field theory. the additional ghost degrees of freedom arising in "truncations" of an effective action at a finite order in derivatives could be fictitious degrees of freedom. their contributions to the fully-dressed propagator - the residues of the correspondi... | non-perturbative unitarity and fictitious ghosts in quantum gravity |
prospects for quarkonium-production studies accessible during the upcoming high-luminosity phases of the cern large hadron collider operation after 2021 are reviewed. current experimental and theoretical open issues in the field are assessed together with the potential for future studies in quarkonium-related physics. ... | prospects for quarkonium studies at the high-luminosity lhc |
starting from gravity in asymptotically flat spacetime, the bms momentum fluxes are constructed. these are non-local expressions of the solution space living on the celestial riemann surface. they transform in the coadjoint representation of the extended bms group and correspond to virasoro primaries under the action o... | bms flux algebra in celestial holography |
we investigate the propagating degrees of freedom of $f(q)$-gravity in a $4$-dimensional space-time under the imposition of the coincident gauge by performing the dirac-bergmann analysis. in this work, we start with a top-down reconstruction of the metric-affine gauge theory of gravity based only on the concept of a ve... | dirac-bergmann analysis and degrees of freedom of coincident $f(q)$-gravity |
in this letter, we show that jackiw-teitelboim gravity can be naturally realized in the karch-randall braneworld. notably the role of the dilaton in jackiw-teitelboim gravity is played by the radion in a suitably orbifolded version of the setup. in the classical entanglement entropy calculation, there is an apparent de... | jackiw-teitelboim gravity from the karch-randall braneworld |
in this work, we explore wormhole solutions in f( r, t) theory of gravity, where r is the scalar curvature and t is the trace of stress-energy tensor of matter. to investigate this, we consider a static spherically symmetric geometry with matter contents as anisotropic, isotropic, and barotropic fluids in three separat... | static spherically symmetric wormholes in f( r, t) gravity |
we review the theory of quantum fields propagating in an arbitrary, classical, globally hyperbolic spacetime. our review emphasizes the conceptual issues arising in the formulation of the theory and presents known results in a mathematically precise way. particular attention is paid to the distributional nature of quan... | quantum fields in curved spacetime |
we study the contribution to the entanglement entropy of (2 +1 )-dimensional conformal field theories (cfts) coming from a sharp corner in the entangling surface. this contribution is encoded in a function a (θ ) of the corner opening angle, and was recently proposed as a measure of the degrees of freedom in the underl... | universality of corner entanglement in conformal field theories |
low multiplicity celestial amplitudes of gluons and gravitons tend to be distributional in the celestial coordinates z,z ¯. we provide a new systematic remedy to this situation by studying celestial amplitudes in a basis of light transformed boost eigenstates. motivated by a novel equivalence between light transforms a... | ambidextrous light transforms for celestial amplitudes |
we explore a new class of general properties of thermal holographic green's functions that can be deduced from the near-horizon behaviour of classical perturbations in asymptotically anti-de sitter spacetimes. we show that at negative imaginary matsubara frequencies and appropriate complex values of the wavenumber the ... | horizon constraints on holographic green's functions |
the standard formulation of quantum theory relies on a fixed space-time metric determining the localisation and causal order of events. in general relativity, the metric is influenced by matter, and is expected to become indefinite when matter behaves quantum mechanically. here, we develop a framework to operationally ... | quantum clocks and the temporal localisability of events in the presence of gravitating quantum systems |
in this work we develop a simple protocol to construct interior solutions through gravitational decoupling by the minimal gemetric deformation extended satisfying the vanishing complexity condition. the method is illustrated by using tolman vii and tolman iv solutions as isotropic seeds. | a simple protocol to construct solutions with vanishing complexity by gravitational decoupling |
in general relativity, the contracted bianchi identity makes the field equation compatible with the energy conservation, likewise in f(r) theories of gravity. we show that this classical phenomenon is not guaranteed in the symmetric teleparallel theory, and rather generally f(q) model specific. we further prove that th... | on the viability of f(q) gravity models |
the double copy is a much-studied relationship between scattering amplitudes in gauge and gravity theories, that has subsequently been extended to classical field solutions. in nearly all previous examples, the graviton field is defined around minkowski space. recently, it has been suggested that one may set up a doubl... | the kerr-schild double copy in curved spacetime |
conformal carrollian groups are known to be isomorphic to bondi-metzner-sachs (bms) groups that arise as the asymptotic symmetries at the null boundary of minkowski spacetime. the carrollian algebra is obtained from the poincare algebra by taking the speed of light to zero, and the conformal version similarly follows. ... | field theories with conformal carrollian symmetry |
many-body systems with chiral fermions exhibit anomalous transport phenomena originated from quantum anomalies. based on quantum field theory, we derive the kinetic theory for chiral fermions interacting with an external electromagnetic field in a background curved geometry. the resultant framework is u(1) gauge invari... | chiral kinetic theory in curved spacetime |
we suggest and briefly review a new sort of superrenormalizable models of higher derivative quantum gravity. the higher derivative terms in the action can be introduced in such a way that all the unphysical massive states have complex poles. according to the literature on lee-wick quantization, in this case the theory ... | superrenormalizable quantum gravity with complex ghosts |
cotesta et al. (2022) reanalyze the gw150914 ringdown, arguing against the presence of an overtone and suggesting claims of its detection in isi et al. (2019) were driven by noise. here we point out a number of technical errors in that analysis, including a software bug, and show that features highlighted as problemati... | comment on "analysis of ringdown overtones in gw150914" |
wormholes are intriguing classical solutions in general relativity, that have fascinated theoretical physicists for decades. in recent years, especially in holography, gravitational wormhole geometries have found a new life in many theoretical ideas related to quantum aspects of gravity. these ideas primarily revolve a... | wormholes and holography: an introduction |
in this letter, we propose a holographic duality for classical gravity on a three-dimensional de sitter space. we first show that a pair of su(2) chern-simons gauge theories reproduces the classical partition function of einstein gravity on a euclidean de sitter space, namely s3 , when we take the limit where the level... | holography in de sitter space via chern-simons gauge theory |
we study bubble of nothing decays and their reverse processes, the creation of vacua through `bubbles of something', in models of the universe based on string theory. from the four-dimensional perspective, the corresponding gravitational instantons contain an end-of-the-world (etw) boundary or brane, realized by the in... | cobordism and bubbles of anything in the string landscape |
in the context of partial entanglement entropy (pee), we study the entanglement structure of the island phases realized in several 2-dimensional holographic set-ups. from a pure quantum information perspective, the entanglement islands emerge from the self-encoding property of the system, which gives us new insights on... | ownerless island and partial entanglement entropy in island phases |
we apply the holographic principle at the early universe, obtaining an inflation realization of holographic origin. such a consideration has equal footing with its well-studied late-time application, and moreover the decrease of the horizons at early times naturally increases holographic energy density at inflationary ... | holographic inflation |
at the intersection of quantum theory and relativity lies the possibility of a clock experiencing a superposition of proper times. we consider quantum clocks constructed from the internal degrees of relativistic particles that move through curved spacetime. the probability that one clock reads a given proper time condi... | quantum clocks observe classical and quantum time dilation |
the difficulty of building metastable vacua in string theory, has led some to conjecture that in the string theory landscape, potentials satisfy | ∇v / v | ≥ c ∼ o (1). this condition, which is supported by different explicit constructions, suggests that the efts which lead to metastable de-sitter vacua belong to what ... | rescuing single field inflation from the swampland |
the null energy condition can be violated stably in generalized galileon theories, which gives rise to the possibilities of healthy nonsingular cosmologies. however, it has been reported that in many cases cosmological solutions are plagued with instabilities or have some pathologies somewhere in the whole history of t... | generic instabilities of nonsingular cosmologies in horndeski theory: a no-go theorem |
we formulate positivity bounds for scattering amplitudes including exchange of massless particles. we generalize the standard construction through dispersion relations to include the presence of a branch cut along the real axis in the complex plane for the maldestam variable s . in general, validity of these bounds req... | massless positivity in graviton exchange |
using modern amplitude techniques we compute the leading classical and quantum corrections to the gravitational potential between two massive scalars induced by adding cubic terms to einstein gravity. we then study the scattering of massless scalars, photons and gravitons off a heavy scalar in the presence of the same ... | on higher-derivative effects on the gravitational potential and particle bending |
we argue that the degrees of freedom in a d-dimensional cft can be reorganized in an insightful way by studying observables on the moduli space of causal diamonds (or equivalently, the space of pairs of timelike separated points). this 2 d-dimensional space naturally captures some of the fundamental nonlocality and cau... | entanglement, holography and causal diamonds |
recently, damour computed the radiation reaction on gravitational scattering as the (linear) response to the angular momentum loss which he found to be of o (g2) in the gravitational constant. this is a puzzle because any amplitude calculation would predict both radiated energy and radiated angular momentum to start on... | angular momentum loss in gravitational scattering, radiation reaction, and the bondi gauge ambiguity |
we consider gravitational massive scalar-scalar scattering from unitarity and demonstrate how intermediate soft graviton behavior and the concept of extracting classical physics from localization of integrands on velocity cuts devise an efficient extraction scheme for computing the classical post-minkowskian radial act... | post-minkowskian radial action from soft limits and velocity cuts |
a complete theory of gravity impels us to go beyond einstein's general relativity. one promising approach lies in a new class of teleparallel theory of gravity named f (q ), where the nonmetricity q is responsible for the gravitational interaction. the important roles any of these alternative theories should obey are t... | energy conditions in f (q ) gravity |
we present the analytical calculation of entanglement entropy for a class of two-dimensional field theories governed by the symmetries of the galilean conformal algebra, thus providing a rare example of such an exact computation. these field theories are the putative holographic duals to theories of gravity in three-di... | entanglement entropy in galilean conformal field theories and flat holography |
we consider spacetime initiated by a finite-sized initial boundary as a generalization of the hartle-hawking no-boundary state. we study entanglement entropy of matter state prepared by such spacetime. we find that the entanglement entropy for large subregion is given either by the initial state entanglement or the ent... | island for gravitationally prepared state and pseudo entanglement wedge |
we examine how to construct a spatial manifold and its geometry from the entanglement structure of an abstract quantum state in hilbert space. given a decomposition of hilbert space h into a tensor product of factors, we consider a class of "redundancy-constrained states" in h that generalize the area-law behavior for ... | space from hilbert space: recovering geometry from bulk entanglement |
the precision of the cosmological data allows us to accurately approximate the predictions for cosmological observables by taylor expanding up to a low order the dependence on the cosmological parameters around a reference cosmology. by applying this observation to the redshift-space one-loop galaxy power spectrum of t... | efficient cosmological analysis of the sdss/boss data from the effective field theory of large-scale structure |
in this analysis, we study the quantum motions of a non-relativistic particle confined by the aharonov-bohm (ab) flux field with harmonic oscillator plus mie-type potential in a point-like defect. we determine the eigenvalue solution of the particles analytically and discuss the effects of the topological defect and fl... | point-like defect on schrödinger particles under flux field with harmonic oscillator plus mie-type potential: application to molecular potentials |
in the first part of this note we argue that ten dimensional consistency requirements in the form of a certain tadpole cancellation condition can be satisfied by kklt type vacua of type iib string theory. we explain that a new term of non-local nature is generated dynamically once supersymmetry is broken and ensures ca... | gaugino condensation and small uplifts in kklt |
we propose a new swampland conjecture stating that the limit of vanishing gravitino mass corresponds to the massless limit of an infinite tower of states and to the consequent breakdown of the effective field theory. we test our proposal in large classes of models coming from compactification of string theory to four d... | the gravitino and the swampland |
we study the ultraviolet stability of gravity-matter systems for general numbers of minimally coupled scalars and fermions. this is done within the functional renormalization group setup put forward in [n. christiansen, b. knorr, j. meibohm, j. m. pawlowski, and m. reichert, phys. rev. d 92, 121501 (2015).] for pure gr... | asymptotic safety of gravity-matter systems |
gauge-invariant observables for quantum gravity are described, with explicit constructions given primarily to leading order in newton's constant, analogous to and extending constructions first given by dirac in quantum electrodynamics. these can be thought of as operators that create a particle, together with its insep... | diffeomorphism-invariant observables and their nonlocal algebra |
several models of quantum gravity predict the emergence of a minimal length at planck scale. this is commonly taken into consideration by modifying the heisenberg uncertainty principle into the generalized uncertainty principle. in this work, we study the implications of a polynomial generalized uncertainty principle o... | generalized uncertainty principle: from the harmonic oscillator to a qft toy model |
we prove perturbative renormalizability of projectable hořava gravity. the key element of the argument is the choice of a gauge which ensures the correct anisotropic scaling of the propagators and their uniform falloff at large frequencies and momenta. this guarantees that the counterterms required to absorb the loop d... | renormalization of hořava gravity |
this work is the first step in a two-part investigation of real-time replica wormholes. here we study the associated real-time gravitational path integral and construct the variational principle that will define its saddle-points. we also describe the general structure of the resulting real-time replica wormhole saddle... | real-time gravitational replicas: formalism and a variational principle |
the thermodynamics of the taub-nut solution has been predominantly studied in the euclidean sector, upon imposing the condition for the absence of misner strings. such thermodynamics is quite exceptional: the periodicity of the euclidean time is restricted and thence the newman-unti-tamburino (nut) charge cannot be ind... | thermodynamics of lorentzian taub-nut spacetimes |
we propose, as a novelty in the literature, the modeling of wormholes within a particular case of f( r, t) gravity, namely f(r,t)=r+α r2+λ t, with r and t being the ricci scalar and trace of the energy-momentum tensor, respectively, while α and λ are constants. although such a functional form application can be found i... | wormholes in r^2-gravity within the f( r, t) formalism |
we consider two distinct limits of general relativity that in contrast to the standard non-relativistic limit can be taken at the level of the einstein-hilbert action instead of the equations of motion. one is a non-relativistic limit and leads to a so-called galilei gravity theory, the other is an ultra-relativistic l... | carroll versus galilei gravity |
the linear-order effects of radiation-reaction on the classical scattering of two point masses, in general relativity, are derived by a variation-of-constants method. explicit expressions for the radiation-reaction contributions to the changes of 4-momentum during scattering are given to linear order in the radiative l... | radiative contributions to gravitational scattering |
the study of cosmological perturbation theory in f(t) gravity is a topic of great interest in teleparallel gravity since this is one of the simplest generalizations of the theory that modifies the teleparallel equivalent of general relativity. in this work, we explore the possibility of a non-flat flrw background solut... | perturbations in non-flat cosmology for f(t) gravity |
we compare two optical clocks based on the 1/2s2(f =0 )→ 3/2d2 (f =2 ) electric quadrupole (e2) and the 1/2s2(f =0 )→7/2f2(f =3 ) electric octupole (e3) transition of 171yb+ and measure the frequency ratio νe 3/νe 2=0.932 829 404 530 965 376 (32 ) , improving upon previous measurements by an order of magnitude. using t... | improved limits for violations of local position invariance from atomic clock comparisons |
we explore the impact of asymptotically safe quantum gravity on the abelian gauge coupling in a model including a charged scalar, confirming indications that asymptotically safe quantum fluctuations of gravity could trigger a power-law running towards a free fixed point for the gauge coupling above the planck scale. si... | upper bound on the abelian gauge coupling from asymptotic safety |
we obtain for the first time all quadratic-in-spin interactions in spinning binaries at the third subleading order in post-newtonian (pn) gravity, and provide their observable binding energies and their gauge-invariant relations to the angular momentum. our results are valid for generic compact objects, orbits, and spi... | quadratic-in-spin interactions at fifth post-newtonian order probe new physics |
we provide a prescription for the phase space of general relativity on intersecting null surfaces using the null initial value formulation. we extend previous work by enlarging the phase space to allow variations of the inaffinity parameter and the null generator. we show that the resulting symmetry group consists of a... | the gravitational phase space of horizons in general relativity |
it is well-known that the theory of cotton gravity proposed by harada is trivially solved by all isotropic and homogeneous cosmologies. we show that this under-determination is more general. more precisely, the degree of arbitrariness in the solutions increases with the degree of symmetry. we give two simple examples. ... | cotton gravity is not predictive |
we exploit the concept of hydrodynamic attractors to establish a macroscopic description of the early time out-of-equilibrium dynamics of high energy heavy-ion collisions. one direct consequence is a general relation between the initial state energy and the produced particle multiplicities measured in experiments. when... | hydrodynamic attractors, initial state energy, and particle production in relativistic nuclear collisions |
we consider the evolution of quantum fields during inflation, and show that the total-energy singularities appearing in the perturbative expansion of the late-time wavefunction of the universe are purely real when the external states are massless scalars and massless gravitons. our proof relies on the tree-level approx... | cosmological correlators through the looking glass: reality, parity, and factorisation |
in this paper, we explore the relativistic quantum motion of spin-zero scalar particles influenced by rainbow gravity's in the background of a magnetic solution. our focus is on the bonnor-melvin magnetic space-time, a four-dimensional solution featuring a non-zero cosmological constant. to analyze this scenario, we so... | effects of rainbow gravity on charge-free scalar bosons in bonnor-melvin s universe with cosmological constant |
the double copy relates scattering amplitudes and classical solutions in yang-mills theory, gravity, and related field theories. previous work has shown that this has an explicit realisation in self-dual ym theory, where the equation of motion can be written in a form that maps directly to plebański's heavenly equation... | new heavenly double copies |
we give a double copy construction for the symmetries of the self-dual sectors of yang-mills (ym) and gravity, in the light-cone formulation. we find an infinite set of double copy constructible symmetries. we focus on two families which correspond to the residual diffeomorphisms on the gravitational side. for the firs... | a double copy for asymptotic symmetries in the self-dual sector |
we present a comparative study of inflation in two theories of quadratic gravity with gauged scale symmetry: (1) the original weyl quadratic gravity and (2) the theory defined by a similar action but in the palatini approach obtained by replacing the weyl connection by its palatini counterpart. these theories have diff... | gauging scale symmetry and inflation: weyl versus palatini gravity |
we utilize three point amplitudes with (spinning) particles of unequal mass and a graviton to capture the dynamics of absorption processes. we demonstrate that the construction can represent the spheroidal harmonics appearing in the teukolsky equations. the absolute square of the ``wilson coefficients'' in this effecti... | on-shell approach to (spinning) gravitational absorption processes |
we argue that the starobinsky model of inflation, realised via an $r^2$ term in the lagrangian, can originate from quantum effects due to a tower of light species. by means of two separate arguments, we show how this implies that the scale of the $r^2$ term must be of order of the species scale $\lambda_s$, namely the ... | starobinsky inflation in the swampland |
motivated by the study of entanglement island in the karch-randall braneworld, it has been conjectured and proven in general that entanglement island is not consistent with long-range (massless) gravity. in this paper, we provide a careful check of this conclusion in a model of massless gravity that is constructed usin... | revisiting recent progress in the karch-randall braneworld |
enhancements of primordial curvature fluctuations in single field inflation often involve departures from attractor trajectories in the phase space. we study enhancement/suppression of primordial fluctuations in one of the simplest models with exact background solutions for arbitrary initial conditions: a single field ... | an exact model for enhancing/suppressing primordial fluctuations |
the eigenstate thermalization hypothesis makes a prediction for the statistical distribution of matrix elements of simple operators in energy eigenstates of chaotic quantum systems. as a leading approximation, off-diagonal matrix elements are described by gaussian random variables but higher-point correlation functions... | non-gaussianities in the statistical distribution of heavy ope coefficients and wormholes |
we perform a detailed analysis of the possible violation of various bell-type inequalities for systems of vector boson-antiboson pairs. considering the general case of an overall scalar state of the bipartite system, we identify two distinct classes of such states, and determine the joint probabilities of spin measurem... | bell-type inequalities for systems of relativistic vector bosons |
in this paper, we investigate the effect of the generalized uncertainty principle (gup) in the casimir wormhole spacetime recently proposed by garattini (eur phys j c 79: 951, 2019). in particular, we consider three types of gup relations, firstly the kempf, mangano and mann (kmm) model, secondly the detournay, gabriel... | traversable wormholes supported by gup corrected casimir energy |
we construct various limits of jt gravity, including newton-cartan and carrollian versions of dilaton gravity in two dimensions as well as a theory on the three-dimensional light cone. in the bf formulation our boundary conditions relate boundary connection with boundary scalar, yielding as boundary action the particle... | limits of jt gravity |
in this work, we present a hierarchical solution-generating technique employing the minimum gravitational decoupling (mgd) method and the generalized concept of complexity as applied to class i spacetime for bounded compact objects in classical general relativity. starting off with an anisotropic seed solution describe... | isotropization of embedding class i spacetime and anisotropic system generated by complexity factor in the framework of gravitational decoupling |
new boundary conditions for asymptotically flat spacetimes are given at spatial infinity. these boundary conditions are invariant under the bms group, which acts non trivially. the boundary conditions fulfill all standard consistency requirements: (i) they make the symplectic form finite; (ii) they contain the schwarzc... | bms group at spatial infinity: the hamiltonian (adm) approach |
observations of gravitational lenses in strong gravitational fields give us a clue to understanding dark compact objects. in this paper, we extend a method to obtain a deflection angle in a strong deflection limit provided by bozza [phys. rev. d 66, 103001 (2002)] to apply to ultrastatic spacetimes. we also discuss on ... | strong deflection limit analysis and gravitational lensing of an ellis wormhole |
we study how two fully featured hydrogenlike atoms harvest entanglement from the electromagnetic field vacuum, even when the atoms are spacelike separated. we compare the electromagnetic case—qualitatively and quantitatively—with previous results that used scalar fields and featureless, idealized atomic models. our stu... | entanglement harvesting from the electromagnetic vacuum with hydrogenlike atoms |
we show that generalized symmetries cannot be charged under a continuous global symmetry having a noether current. further, only non-compact generalized symmetries can be charged under a continuous global symmetry. these results follow from a finer classification of twist operators, which naturally extends to finite gr... | generalized symmetries and noether's theorem in qft |
the self-interactions of the conformal mode of the graviton are controlled, in dimensionless gravity theories (agravity), by a coupling f_0 that is not asymptotically free. we show that, nevertheless, agravity can be a complete theory valid up to infinite energy. when f_0 grows to large values, the conformal mode of th... | agravity up to infinite energy |
the kerr-schild double copy relates exact solutions of gauge and gravity theories. in all previous examples, the gravity solution is associated with an abelian-like gauge theory object, which linearises the yang-mills equations. this appears to be at odds with the double copy for scattering amplitudes, in which the non... | topology and wilson lines: global aspects of the double copy |
quantum mechanical models with a minimal length are often described by modifying the commutation relation between position and momentum. although this represents a small complication when described in momentum space, at least formally, the (quasi-)position representation acquires numerous issues, source of misunderstan... | on the quasi-position representation in theories with a minimal length |
the becchi-rouet-stora-tyutin (brst) transformations and equations of motion of a gravity-two-form-dilaton system are derived from the product of two yang-mills theories in a brst covariant form, to linear approximation. the inclusion of ghost fields facilitates the separation of the graviton and dilaton. the gravitati... | gravity as gauge theory squared: a ghost story |
we derive the most general homogeneous and isotropic teleparallel geometries, defined by a metric and a flat, affine connection. we find that there are five branches of connection solutions, which are connected via several limits, and can further be restricted to the torsion-free and metric-compatible cases. we apply o... | homogeneous and isotropic cosmology in general teleparallel gravity |
the double copy relates scattering amplitudes in gauge and gravity theories. it has also been extended to classical solutions, and a number of approaches have been developed for doing so. one of these involves expressing fields in a variety of (super-)gravity theories in terms of convolutions of gauge fields, including... | the convolutional double copy: a case study with a point |
despite having the somewhat successful description of accelerated cosmology, the early evolution of the universe always challenges mankind. our promising approach lies in a new class of symmetric teleparallel theory of gravity named f(q), where the non-metricity scalar q is responsible for the gravitational interaction... | isotropization of locally rotationally symmetric bianchi-i universe in f(q)-gravity |
in this paper, we have shown the matter bounce scenario of the universe in an extended symmetric teleparallel gravity, the f(q) gravity. motivated from the bouncing scenario and loop quantum cosmology (lqc), the form of the function f(q) has been obtained at the backdrop of friedmann-lemai ^tre-robertson walker (flrw) ... | matter bounce scenario in extended symmetric teleparallel gravity |
the gravitational asymptotic safety program envisions a high-energy completion of the gravitational interactions by an interacting renormalization group fixed point, the reuter fixed point. the primary tool for investigating this scenario are functional renormalization group equations, foremost the wetterich equation. ... | the functional renormalization group in quantum gravity |
correlation functions of primordial density fluctuations provide an exciting probe of the physics governing the earliest moments of our universe. however, the standard approach to compute them is technically challenging. theoretical predictions are therefore available only in restricted classes of theories. in this let... | cosmological flow of primordial correlators |
we investigate the ultraviolet behavior of quantum gravity within a functional renormalization group approach. the present setup includes the full ghost and graviton propagators and, for the first time, the dynamical graviton three-point function. the latter gives access to the coupling of dynamical gravitons and makes... | local quantum gravity |
we employ the arnowitt-deser-misner formalism to study the renormalization group flow of gravity minimally coupled to an arbitrary number of scalar, vector, and dirac fields. the decomposition of the gravitational degrees of freedom into a lapse function, shift vector, and spatial metric equips spacetime with a preferr... | renormalization group fixed points of foliated gravity-matter systems |
it has been known since the earliest days of quantum field theory (qft) that infrared divergences arise in scattering theory with massless fields. these infrared divergences are manifestations of the memory effect: at order 1 /r a massless field generically will not return to the same value at late retarded times (u →+... | infrared finite scattering theory in quantum field theory and quantum gravity |
we continue our analysis of a quantum cosmology model describing a flat friedmann-lemaître-robertson-walker universe filled with a (free) massless scalar field and an arbitrary perfect fluid. for positive energy density in the scalar and fluid, each classical solution has a singularity and expands to infinite volume. w... | unitarity, clock dependence and quantum recollapse in quantum cosmology |
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