abstract stringlengths 3 192k | title stringlengths 4 857 |
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we study the page curve for asymptotically flat eternal schwarzschild black holes in four and higher spacetime dimensions. before the page time, the entanglement entropy grows linearly in time. after the page time, the entanglement entropy of a given region outside the black hole is largely modified by the emergence of... | islands in schwarzschild black holes |
in this note, following [1-3], we introduce and study various holographic systems which can describe evaporating black holes. the systems we consider are boundary conformal field theories for which the number of local degrees of freedom on the boundary (cbdy) is large compared to the number of local degrees of freedom ... | information radiation in bcft models of black holes |
celestial amplitudes represent 4d scattering of particles in boost, rather than the usual energy-momentum, eigenstates and hence are sensitive to both uv and ir physics. we show that known uv and ir properties of quantum gravity translate into powerful constraints on the analytic structure of celestial amplitudes. for ... | celestial amplitudes from uv to ir |
in holographic duality an eternal anti-de sitter black hole is described by two copies of the boundary conformal field theory in the thermal field double state. this identification has many puzzles, including the boundary descriptions of the event horizons, the interiors of the black hole, and the singularities. compou... | causal connectability between quantum systems and the black hole interior in holographic duality |
in this paper we use the ads/cft correspondence to refine and then establish a set of old conjectures about symmetries in quantum gravity. we first show that any global symmetry, discrete or continuous, in a bulk quantum gravity theory with a cft dual would lead to an inconsistency in that cft, and thus that there are ... | symmetries in quantum field theory and quantum gravity |
we recently introduced in [9] a boundary-to-bound dictionary between gravitational scattering data and observables for bound states of non-spinning bodies. in this paper, we elaborate further on this holographic map. we start by deriving the following — remarkably simple — formula relating the periastron advance to the... | from boundary data to bound states. part ii. scattering angle to dynamical invariants (with twist) |
we consider black holes in 2d de sitter jt gravity coupled to a cft, and entangled with matter in a disjoint non-gravitating universe. tracing out the entangling matter leaves the cft in a density matrix whose stress tensor backreacts on the de sitter geometry, lengthening the wormhole behind the black hole horizon. na... | islands in de sitter space |
the gravitational wave observations gw150914 and gw151226 by advanced ligo provide the first opportunity to learn about physics in the extreme gravity environment of coalescing binary black holes. the ligo scientific collaboration and the virgo collaboration have verified that this observation is consistent with einste... | theoretical physics implications of the binary black-hole mergers gw150914 and gw151226 |
for the first time, we construct an inspiral-merger-ringdown waveform model within the effective-one-body formalism for spinning, nonprecessing binary black holes that includes gravitational modes beyond the dominant (ℓ,|m |)=(2 ,2 ) mode, specifically (ℓ,|m |)=(2 ,1 ),(3 ,3 ),(4 ,4 ),(5 ,5 ). our multipolar waveform m... | enriching the symphony of gravitational waves from binary black holes by tuning higher harmonics |
we show how to decoupling two spherically symmetric and static gravitational sources through the most general possible extension of the so-called minimal geometric deformation-decoupling. as a test, we decouple the einstein-maxwell system and reproduce the reissner-nordstrom solution. we show the potential of this meth... | decoupling gravitational sources in general relativity: the extended case |
quantum computational complexity estimates the difficulty of constructing quantum states from elementary operations, a problem of prime importance for quantum computation. surprisingly, this quantity can also serve to study a completely different physical problem - that of information processing inside black holes. qua... | quantum computational complexity from quantum information to black holes and back |
we use a previously developed scattering-amplitudes-based framework for determining two-body hamiltonians for generic binary systems with arbitrary spin s . by construction this formalism bypasses difficulties with unphysical singularities or higher-time derivatives. this framework has been previously used to obtain th... | binary dynamics through the fifth power of spin at o (g2) |
the large-n limit of asymptotically flat two-dimensional dilaton gravity coupled to n free matter fields provides a useful toy model for semiclassical black holes and the information paradox. analyses of the asymptotic information flux as given by the entanglement entropy show that it follows the hawking curve, indicat... | islands in asymptotically flat 2d gravity |
we provide a moduli-dependent definition of species scale in quantum gravity based on black hole arguments. concretely, it is derived from a lower bound on the entropy of extremal black holes with higher curvature corrections, which ensures that the black hole can be reliably described within the effective theory. by d... | black hole entropy and moduli-dependent species scale |
we provide the analytic waveform in time domain for the scattering of two kerr black holes at leading order in the post-minkowskian expansion and up to fourth order in both spins. the result is obtained by the generalization of the kmoc formalism to radiative observables, combined with the analytic continuation of the ... | spinning waveforms from kmoc at leading order |
there are various definitions of the concept of complexity in quantum field theory as well as for finite quantum systems. for several of them there are conjectured holographic bulk duals. in this work we establish an entry in the ads/cft dictionary for one such class of complexity, namely krylov or k-complexity. for th... | a bulk manifestation of krylov complexity |
motivated by holographic complexity proposals as novel probes of black hole spacetimes, we explore circuit complexity for thermofield double (tfd) states in free scalar quantum field theories using the nielsen approach. for tfd states at t = 0, we show that the complexity of formation is proportional to the thermodynam... | complexity and entanglement for thermofield double states |
we introduce on-shell variables for heavy particle effective theories (hpets) with the goal of extending heavy black hole effective theory to higher spins and of facilitating its application to higher post-minkowskian orders. these variables inherit the separation of spinless and spin-inclusive effects from the hpet fi... | on-shell heavy particle effective theories |
in the 1980's, work by coleman and by giddings and strominger linked the physics of spacetime wormholes to `baby universes' and an ensemble of theories. we revisit such ideas, using features associated with a negative cosmological constant and asymptotically ads boundaries to strengthen the results, introduce a change ... | transcending the ensemble: baby universes, spacetime wormholes, and the order and disorder of black hole information |
we study the ads/bcft duality between two-dimensional conformal field theories with two boundaries and three-dimensional anti-de sitter space with two karch-randall branes. we compute the entanglement entropy of a bipartition of the bcft, on both the gravity side and the field theory side. at finite temperature this en... | holographic bcfts and communicating black holes |
we explore various tree-level double copy constructions for amplitudes including massive particles with spin. by working in general dimensions, we use that particles with spins s ≤ 2 are fundamental to argue that the corresponding double copy relations partially follow from compactification of their massless counterpar... | on the double copy for spinning matter |
we present a general procedure for constructing exact black hole solutions with electric or magnetic charges in general relativity coupled to a nonlinear electrodynamics. we obtain a variety of two-parameter family spherically symmetric black hole solutions. in particular, the singularity at the center of the space-tim... | construction of regular black holes in general relativity |
using extended island formula we compute entanglement entropy of hawking radiation for black hole solutions of certain gravitational models containing higher derivative terms. to be concrete we consider two different four dimensional models to compute entropy for both asymptotically flat and ads black holes. one observ... | island in the presence of higher derivative terms |
the fate of cauchy horizons, such as those found inside charged black holes, is intrinsically connected to the decay of small perturbations exterior to the event horizon. as such, the validity of the strong cosmic censorship (scc) conjecture is tied to how effectively the exterior damps fluctuations. here, we study mas... | quasinormal modes and strong cosmic censorship |
we study the shadows cast by the different types of rotating regular black holes viz. ayón-beato-garcía (abg), hayward, and bardeen. these black holes have in addition to the total mass (m ) and rotation parameter (a ), different parameters as electric charge (q ), deviation parameter (g ), and magnetic charge (g*). in... | shadow of rotating regular black holes |
a remarkable yet mysterious property of black holes is that their entropy is proportional to the horizon area. this area law inspired the holographic principle, which was later realized concretely in gauge-gravity duality. in this context, entanglement entropy is given by the area of a minimal surface in a dual spaceti... | the gravity dual of rényi entropy |
we review potential low-frequency gravitational-wave sources, which are expected to be detected by taiji, a chinese space-based gravitational-wave detector, estimate the detection rates of these gravitational-wave sources and present the parameter estimation of massive black hole binaries. | taiji program: gravitational-wave sources |
quantum black holes are described by a large number of macroscopically indistinguishable microstates. correlation functions of fields outside the horizon at long time separation probe this indistinguishability. the simplest of these, the thermal two-point function, oscillates erratically around a nonperturbatively smal... | late time correlation functions, baby universes, and eth in jt gravity |
scrambling, a process in which quantum information spreads over a complex quantum system, becoming inaccessible to simple probes, occurs in generic chaotic quantum many-body systems, ranging from spin chains to metals and even to black holes. scrambling can be measured using out-of-time-ordered correlators (otocs), whi... | accessing scrambling using matrix product operators |
we study the stability of quasinormal modes (qnm) in asymptotically flat black hole spacetimes by means of a pseudospectrum analysis. the construction of the schwarzschild qnm pseudospectrum reveals the following: (i) the stability of the slowest-decaying qnm under perturbations respecting the asymptotic structure, rea... | pseudospectrum and black hole quasinormal mode instability |
recent progress in our understanding of the black hole information paradox has lead to a new prescription for calculating entanglement entropies, which involves special subsystems in regions where gravity is dynamical, called \textit{quantum extremal islands}. we present a simple holographic framework where the emergen... | quantum extremal islands made easy, part i: entanglement on the brane |
the presence of a bright "photon ring" surrounding a dark "black hole shadow" has been discussed as an important feature of the observational appearance of emission originating near a black hole. we clarify the meaning and relevance of these heuristics with analytic calculations and numerical toy models. the standard u... | black hole shadows, photon rings, and lensing rings |
the exactly solvable sachdev-ye-kitaev (syk) model has recently received considerable attention in both condensed matter and high energy physics because it describes quantum matter without quasiparticles, while being at the same time the holographic dual of a quantum black hole. in this letter, we examine syk-based cha... | quantum advantage in the charging process of sachdev-ye-kitaev batteries |
in this note, we consider entanglement and renyi entropies for spatial subsystems of a boundary conformal field theory (bcft) or of a cft in a state constructed using a euclidean bcft path integral. holographic calculations suggest that these entropies undergo phase transitions as a function of time or parameters descr... | bcft entanglement entropy at large central charge and the black hole interior |
we formulate a version of the information paradox in de sitter spacetime and show that it is solved by the emergence of entanglement islands in the context of the de sitter/de sitter correspondence; in particular, the entanglement entropy of a subregion obeys a time-dependent page curve. our construction works in gener... | information paradox and its resolution in de sitter holography |
superradiance is a radiation enhancement process that involves dissipative systems. with a 60 year-old history, superradiance has played a prominent role in optics, quantum mechanics and especially in relativity and astrophysics. in general relativity, black-hole superradiance is permitted by the ergoregion, that allow... | superradiance |
we describe an efficient method for extracting the parts of d -dimensional loop integrals that are needed to derive observables in classical general relativity from scattering amplitudes. our approach simplifies the soft-region method of integration by judiciously combining terms before the final integrations. we demon... | classical gravity from loop amplitudes |
we compute holographic entanglement entropy for subregions of a bcft thermal state living on a nongravitating black hole background. the system we consider is doubly holographic and dual to an eternal black string with an embedded karch-randall brane that is parameterized by its angle. entanglement islands are conventi... | entanglement phase structure of a holographic bcft in a black hole background |
we study the islands and the page curve in the 1+1-dimensional eternal dilaton black hole models. without islands, the entanglement entropy of the radiation grows linearly at late time. however with an island, its growth stops at the value of almost twice of the black hole entropy. therefore an island emerges at the la... | notes on islands in asymptotically flat 2d dilaton black holes |
an important open question in black hole thermodynamics is about the existence of a "mass gap" between an extremal black hole and the lightest near-extremal state within a sector of fixed charge. in this paper, we reliably compute the partition function of reissner-nordström near-extremal black holes at temperature sca... | the statistical mechanics of near-extremal black holes |
forty years after the discovery of hawking radiation, its exact nature remains elusive. if hawking radiation does not carry any information out from the ever shrinking black hole, it seems that unitarity is violated once the black hole completely evaporates. on the other hand, attempts to recover information via quantu... | black hole remnants and the information loss paradox |
the thermodynamic euler equation for high-energy states of large-n gauge theories is derived from the dependence of the extensive quantities on the number of colors n . this euler equation relates the energy of the state to the temperature, entropy, number of degrees of freedom and its chemical potential, but not to th... | holographic thermodynamics requires a chemical potential for color |
we study the index of $\mathcal{n}=4$ yang-mills theory on $s^3\times\mathbb{r}$ at large angular momenta. a generalized cardy limit exhibits macroscopic entropy at large $n$. our result is derived using free qft analysis, and also a background field method on $s^3$. the index sets a lower bound on the entropy. it satu... | large ads black holes from qft |
we revisit the amplitude-based derivation of gravitational waveform for the scattering of two scalar black holes at subleading post-minkowskian (pm) order. we take an eikonal-inspired approach to the two-massive-particle cut needed in the kmoc framework, as highlighted in arxiv:2308.02125, and show that its effect is t... | an eikonal-inspired approach to the gravitational scattering waveform |
we analyse particle species and the species scale in quantum gravity from a thermodynamic perspective. in close analogy to black hole thermodynamics, we propose that particle species have an entropy and a temperature, which is determined by the species scale. this is identical to the bekenstein-hawking entropy of a cor... | species entropy and thermodynamics |
the origin of black hole mergers discovered by the ligo and virgo gravitational-wave observatories is currently unknown. gw190521 is the heaviest black hole merger detected so far. its observed high mass and possible spin-induced orbital precession could arise from the binary having formed following a close encounter. ... | eccentricity estimate for black hole mergers with numerical relativity simulations |
we propose that the dynamics of kerr black holes is strongly constrained by the principle of gauge symmetry. we initiate the construction of effective field theories for kerr black holes of any integer quantum spin s using stückelberg fields, and show that the known three-point kerr amplitudes are uniquely predicted us... | kerr black holes from massive higher-spin gauge symmetry |
we study the topology of the thermodynamic space of four dimensional dyonic anti-de sitter (ads) black hole in three different ensembles: canonical, mixed, and grand canonical ensemble. while canonical ensemble refers to the ensemble with fixed electric and magnetic charges, mixed ensemble is an ensemble where we fix m... | thermodynamic topology of 4d dyonic ads black holes in different ensembles |
we test various conjectures about quantum gravity for six-dimensional string compactifications in the framework of f-theory. starting with a gauge theory coupled to gravity, we analyze the limit in kähler moduli space where the gauge coupling tends to zero while gravity is kept dynamical. we show that such a limit must... | tensionless strings and the weak gravity conjecture |
we provide universal expressions for the classical piece of the amplitude given by the graviton/photon exchange between massive particles of arbitrary spin, at both tree and one loop level. in the gravitational case this leads to higher order terms in the post-newtonian expansion, which have been previously used in the... | holomorphic classical limit for spin effects in gravitational and electromagnetic scattering |
as gravitational-wave detectors become more sensitive and broaden their frequency bandwidth, we will access a greater variety of signals emitted by compact binary systems, shedding light on their astrophysical origin and environment. a key physical effect that can distinguish among different formation scenarios is the ... | multipolar effective-one-body waveforms for precessing binary black holes: construction and validation |
in this paper we compute the spin-dependent terms of the gravitational potential for general spinning bodies at the leading newton's constant g and to all orders in spin. we utilize the on-shell approach, which extracts the classical potential directly from the scattering amplitude. for spinning particles, extra care i... | classical potential for general spinning bodies |
we consider a black hole in three dimensional ads space entangled with an auxiliary radiation system. we model the microstates of the black hole in terms of a field theory living on an end of the world brane behind the horizon, and allow this field theory to itself have a holographic dual geometry. this geometry is als... | geometric secret sharing in a model of hawking radiation |
we improve the accuracy of the effective-one-body (eob) waveforms that were employed during the first observing run of advanced ligo for binaries of spinning, nonprecessing black holes by calibrating them to a set of 141 numerical-relativity (nr) waveforms. the nr simulations expand the domain of calibration toward lar... | improved effective-one-body model of spinning, nonprecessing binary black holes for the era of gravitational-wave astrophysics with advanced detectors |
recently, new holographic models of black hole evaporation have given fresh insights into the information paradox [1-3]. in these models, the black hole evaporates into an auxiliary bath space after a quantum quench, wherein the holographic theory and the bath are joined. one particularly exciting development is the ap... | information flow in black hole evaporation |
in the context of the einstein-scalar-gauss-bonnet theory, with a general coupling function between the scalar field and the quadratic gauss-bonnet term, we investigate the existence of regular black-hole solutions with scalar hair. based on a previous theoretical analysis, which studied the evasion of the old and nove... | black-hole solutions with scalar hair in einstein-scalar-gauss-bonnet theories |
we discuss a doubly-holographic prescription for black holes in braneworlds with a vanishing cosmological constant. it involves calculating ryu-takayanagi surfaces in ads black funnel spacetimes attached to braneworld black holes in the critical randall- sundrum ii model. critical braneworlds have the virtue of having ... | critical islands |
in a quantum theory of gravity, the species scale $\lambda_s$ can be defined as the scale at which corrections to the einstein action become important or alternatively as codifying the "number of light degrees of freedom", due to the fact that $\lambda_s^{-1}$ is the smallest size black hole described by the eft involv... | species scale in diverse dimensions |
the ip matrix model is a simple large n quantum mechanical model made up of an adjoint harmonic oscillator plus a fundamental harmonic oscillator. it is a model introduced previously as a toy model of the gauge theory dual of an ads black hole. in the large n limit, one can solve the schwinger-dyson equation for the fu... | krylov complexity in the ip matrix model |
we study the growth and saturation of the superradiant instability of a complex, massive vector (proca) field as it extracts energy and angular momentum from a spinning black hole, using numerical solutions of the full einstein-proca equations. we concentrate on a rapidly spinning black hole (a =0.99 ) and the dominant... | superradiant instability and backreaction of massive vector fields around kerr black holes |
it was recently conjectured that the quantum complexity of a holographic boundary state can be computed by evaluating the gravitational action on a bulk region known as the wheeler-dewitt patch. we apply this complexity=action duality to evaluate the `complexity of formation' [1, 2], i.e. the additional complexity aris... | complexity of formation in holography |
motivated by recent work on the modified maxwell (modmax) black holes [phys lett b 10.1016/j.physletb.2020.136011], which are invariant in duality rotations and conformal transformations founded in [phys rev d 10.1103/physrevd.102.121703], we probe its effects on the shadow cast, weak field gravitational lensing, and n... | shadow, lensing, quasinormal modes, greybody bounds and neutrino propagation by dyonic modmax black holes |
we analyze gravitational-wave data from the first ligo detection of a binary black-hole merger (gw150914) in search of the ringdown of the remnant black hole. using observations beginning at the peak of the signal, we find evidence of the fundamental quasinormal mode and at least one overtone, both associated with the ... | testing the no-hair theorem with gw150914 |
we consider the status of black hole (bh) solutions with nontrivial scalar fields but no gauge fields, in four-dimensional asymptotically flat spacetimes, reviewing both classical results and recent developments. we start by providing a simple illustration on the physical difference between bhs in electro-vacuum and sc... | asymptotically flat black holes with scalar hair: a review |
following a major upgrade, the two advanced detectors of the laser interferometer gravitational-wave observatory (ligo) held their first observation run between september 2015 and january 2016. with a strain sensitivity of 10-23/√{hz } at 100 hz, the product of observable volume and measurement time exceeded that of al... | gw150914: the advanced ligo detectors in the era of first discoveries |
the recent discovery of the novel four-dimensional static and spherically symmetric gauss-bonnet black hole provides a promising bed to test gauss-bonnet gravity by using astronomical observations (glavan et al. in prl 124:081301, 2020). in this paper, we first obtain the rotating gauss-bonnet black hole solution by us... | testing the nature of gauss-bonnet gravity by four-dimensional rotating black hole shadow |
we discuss holographic models of extremal and non-extremal black holes in contact with a bath in d dimensions, based on a brane world model introduced in arxiv:2006.04851. the main benefit of our setup is that it allows for a high degree of analytic control as compared to previous work in higher dimensions. we show tha... | quantum extremal islands made easy, part ii: black holes on the brane |
a page curve for an evaporating black hole in asymptotically flat spacetime is computed by adapting the quantum ryu-takayanagi (qrt) proposal to an analytically solvable semi-classical two-dimensional dilaton gravity theory. the page time is found to be one third of the black hole lifetime, at leading order in semi-cla... | page curve for an evaporating black hole |
in this paper, we study the physical significance of the thermodynamic volumes of ads black holes using the noether charge formalism of iyer and wald. after applying this formalism to study the extended thermodynamics of a few examples, we discuss how the extended thermodynamics interacts with the recent complexity = a... | noether charge, black hole volume, and complexity |
we review recent progress on the information paradox. we explain why exponentially small correlations in the radiation emitted by a black hole are sufficient to resolve the original paradox put forward by hawking. we then describe a refinement of the paradox that makes essential reference to the black-hole interior. th... | lessons from the information paradox |
we study the information paradox for the eternal black hole with charges on a doubly-holographic model in general dimensions, where the charged black hole on a planck brane is coupled to the baths on the conformal boundaries. in the case of weak tension, the brane can be treated as a probe such that its backreaction to... | island in charged black holes |
we investigate the page curve for a nonstandard black hole which is asymptotically nonflat/ads/ds. for this purpose, we apply the island prescription to the charged linear dilaton black holes and analyze, in detail, the entanglement entropy of hawking radiation for both the nonextremal case and the extremal case. in th... | islands in charged linear dilaton black holes |
the emergence of statistical mechanics for isolated classical systems comes about through chaotic dynamics and ergodicity. here we review how similar questions can be answered in quantum systems. the crucial point is that individual energy eigenstates behave in many ways like a statistical ensemble. a more detailed sta... | eigenstate thermalization hypothesis |
we study the quantum effects of near-extremal black holes near their horizons. the gravitational dynamics in such backgrounds are closely connected to a particle in ads 2 with constant electric field. we use this picture to solve the theory exactly. we will give a formula to calculate all correlation functions with qua... | the quantum gravity dynamics of near extremal black holes |
recent researches of the novel 4d einstein-gauss-bonnet (egb) gravity have attracted great attention. in this paper, we investigate the validity of the weak cosmic censorship conjecture for a novel 4d charged egb black hole with test charged scalar field and test charged particle respectively. for the test charged fiel... | weak cosmic censorship conjecture for the novel 4d charged einstein-gauss-bonnet black hole with test scalar field and particle |
we analyze the charge-to-mass structure of bps states in general infinite-distance limits of n = 2 compactifications of type iib string theory on calabi-yau three-folds, and use the results to sharpen the formulation of the swampland conjectures in the presence of multiple gauge and scalar fields. we show that the bps ... | merging the weak gravity and distance conjectures using bps extremal black holes |
we show that in 2d cfts at large central charge, the coupling of the stress tensor to heavy operators can be re-absorbed by placing the cft in a non-trivial background metric. this leads to a more precise computation of the virasoro conformal blocks between heavy and light operators, which are shown to be equivalent to... | virasoro conformal blocks and thermality from classical background fields |
the species scale serves as a uv cutoff in the gravitational sector of an eft and can depend on the moduli of the theory as the spectrum of the theory varies. it is argued that the dependence of the species scale on massless (or light) modes satisfies . this bound is true at all points in moduli space including also it... | bounds on species scale and the distance conjecture |
we combine tools from effective field theory and generalized unitarity to construct a map between on-shell scattering amplitudes and the classical potential for interacting spinless particles. for general relativity, we obtain analytic expressions for the classical potential of a binary black hole system at second orde... | from scattering amplitudes to classical potentials in the post-minkowskian expansion |
accurate models of gravitational waves from merging black holes are necessary for detectors to observe as many events as possible while extracting the maximum science. near the time of merger, the gravitational waves from merging black holes can be computed only using numerical relativity. in this paper, we present a m... | the sxs collaboration catalog of binary black hole simulations |
the essential singularity in einstein's gravity can be avoidable if the preconditions of penrose's theorem can be bypassed, i.e., if the strong energy condition is broken in the vicinity of a black hole center. the singularity mentioned here includes two aspects: (i) the divergence of curvature invariants, and (ii) the... | regular black holes: a short topic review |
the duality between color and kinematics was originally observed for purely adjoint massless gauge theories, and later found to hold even after introducing massive fermionic and scalar matter in arbitrary gauge-group representations. such a generalization was critical for obtaining both loop amplitudes in pure einstein... | double copy for massive quantum particles with spin |
we show that the newman-janis shift property of the exact kerr solution can be interpreted in terms of a worldsheet effective action. this holds both in gravity, and for the single-copy √{kerr} solution in electrodynamics. at the level of equations of motion, we show that the newman-janis shift holds also for the leadi... | a worldsheet for kerr |
scrambling is the process by which information stored in local degrees of freedom spreads over the many-body degrees of freedom of a quantum system, becoming inaccessible to local probes and apparently lost. scrambling and entanglement can reconcile seemingly unrelated behaviors including thermalization of isolated qua... | unifying scrambling, thermalization and entanglement through measurement of fidelity out-of-time-order correlators in the dicke model |
we analyse the dynamics of near-extremal reissner-nordström black holes in asymptotically four-dimensional anti de sitter space (ads4). we work in the spherically symmetric approximation and study the thermodynamics and the response to a probe scalar field. we find that the behaviour of the system, at low energies and ... | on the dynamics of near-extremal black holes |
these are lecture notes based on a series of lectures presented at the xiii modave summer school in mathematical physics aimed at phd students and young postdocs. the goal is to give an introduction to some of the recent developments in understanding holography in two bulk dimensions, and its connection to microscopics... | ads_{2} holography and the syk model |
the scattering of massless waves of helicity $|h|=0,\frac{1}{2},1$ in schwarzschild and kerr backgrounds is revisited in the long-wavelenght regime. using a novel description of such backgrounds in terms of gravitating massive particles, we compute classical wave scattering in terms of $2\to 2$ qft amplitudes in flat s... | scattering in black hole backgrounds and higher-spin amplitudes: part i |
we calculate the time evolution of entanglement entropy in two-dimensional conformal field theory with a moving mirror. for a setup modeling hawking radiation, we obtain a linear growth of entanglement entropy and show that this can be interpreted as the production of entangled pairs. for the setup, which mimics black ... | entanglement entropy in a holographic moving mirror and the page curve |
entanglement, chaos, and complexity are as important for de sitter space as for ads and for black holes. there are similarities and great differences between ads and ds in how these concepts are manifested in the space-time geometry. in the first part of this paper the ryu-takayanagi prescription, the theory of fast sc... | entanglement and chaos in de sitter holography: an syk example |
we study scenarios where a scalar field has a spatially varying vacuum expectation value such that the total field variation is super-planckian. we focus on the case where the scalar field controls the coupling of a u(1) gauge field, which allows us to apply the weak gravity conjecture to such configurations. we show t... | super-planckian spatial field variations and quantum gravity |
quantum extremal islands reproduce the unitary page curve of an evaporating black hole. this has been derived by including replica wormholes in the gravitational path integral, but for the transient, evaporating black holes most relevant to hawking's paradox, these wormholes have not been analyzed in any detail. in thi... | replica wormholes for an evaporating 2d black hole |
we use n = 8 supergravity as a toy model for understanding the dynamics of black hole binary systems via the scattering amplitudes approach. we compute the conservative part of the classical scattering angle of two extremal (half-bps) black holes with minimal charge misalignment at o (g3) using the eikonal approximatio... | extremal black hole scattering at o (g3): graviton dominance, eikonal exponentiation, and differential equations |
krylov complexity measures the spread of the wavefunction in the krylov basis, which is constructed using the hamiltonian and an initial state. we investigate the evolution of the maximally entangled state in the krylov basis for both chaotic and non-chaotic systems. for this purpose, we derive an ehrenfest theorem for... | universal chaotic dynamics from krylov space |
a two-dimensional cft dual to a semiclassical theory of gravity in three dimensions must have a large central charge c and a sparse low energy spectrum. this constrains the ope coefficients and density of states of the cft via the conformal bootstrap. we define an ensemble of cft data by averaging over ope coefficients... | semiclassical 3d gravity as an average of large-c cfts |
comparing with an ordinary thermodynamic system, we investigate the possible microscopic structure of a charged anti-de sitter black hole completely from the thermodynamic viewpoint. the number density of the black hole molecules is introduced to measure the microscopic degrees of freedom of the black hole. we found th... | insight into the microscopic structure of an ads black hole from a thermodynamical phase transition |
in cardoso et al. [6] it was claimed that quasinormal modes which any stationary, spherically symmetric and asymptotically flat black hole emits in the eikonal regime are determined by the parameters of the circular null geodesic: the real and imaginary parts of the quasinormal mode are multiples of the frequency and i... | are eikonal quasinormal modes linked to the unstable circular null geodesics? |
we report evidence for nonlinear modes in the ringdown stage of the gravitational waveform produced by the merger of two comparable-mass black holes. we consider both the coalescence of black hole binaries in quasicircular orbits and high-energy, head-on black hole collisions. the presence of nonlinear modes in the num... | nonlinear effects in black hole ringdown |
poincaré gauge's theory of gravity is the most noteworthy alternative extension of general relativity that has a correspondence between spin and spacetime geometry. in this paper, we use reissner-nordstrom-de sitter and anti-de sitter solutions, where torsion τ is added as an independent field, to analyze the weak defl... | testing dynamical torsion effects on the charged black hole's shadow, deflection angle and greybody with m87* and sgr. a* from eht |
we propose a generalisation of the weak gravity conjecture in the presence of scalar fields. the proposal is guided by properties of extremal black holes in n=2 supergravity, but can be understood more generally in terms of forbidding towers of stable gravitationally bound states. it amounts to the statement that there... | the weak gravity conjecture and scalar fields |
the weak gravity conjecture states that quantum gravity theories have to contain a charged state with a charge-to-mass ratio bigger than unity. by studying unitarity and causality constraints on higher derivative corrections to the charge-to-mass ratio of extremal back holes, we demonstrate that heavy extremal black ho... | weak gravity conjecture from unitarity and causality |
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