Einstein-Hilbert (EH) action can be separated into a bulk and surface term, with specific (``holographic'') relationship between the two, so that either used to extract information about other. The term also interpreted as entropy of horizon in wide class spacetimes. Since EH is likely just first derivative expansion an effective theory, it interesting ask whether these features continue hold for more general gravitational actions. We provide comprehensive analysis Lagrangians form...

We apply machine learning to understand fundamental aspects of holographic duality, specifically the entropies obtained from apparent and event horizon areas. show that simple features only time series pressure anisotropy, namely values half-widths maxima minima, times these are attained, first zeroes can predict areas horizons in dual bulk geometry at all with a fixed maximum length (10) input vector. also argue entropy functions measures information need be extracted one-point reconstruct...

We obtain an action for a generalized conformal mechanics (GCM) coupled to Jackiw-Teitelboim (JT) gravity from double scaling limit of the motion charged massive particle in near-horizon geometry spherical black hole. When JT is treated classical approximation, backreaction particle’s wave function on time-reparametrization mode (and therefore bulk metric) vanishes while symmetry GCM reparametrized state-dependent way. also construct semi-classical Hilbert space full theory by explicitly...

We investigate background metrics for 2 + 1-dimensional holographic theories where the equilibrium solution behaves as a perfect fluid, and admits thus thermodynamic description. introduce stationary perfect-Cotton geometries, Cotton-York tensor takes form of energy-momentum i.e. they are Petrov type Dt. Fluids in such boundary geometries have non-trivial vorticity. The corresponding bulk can be exactly reconstructed to obtain 3 black-hole solutions with no naked singularities appropriate...

In the absence of an effective cervical cancer screening programme, efforts are being made to explore feasibility using existing infrastructure develop low-cost methods.To evaluate and compare test performance visual inspection cervix by a doctor paramedical worker.Gynaecology outpatient department (OPD), All India Institute Medical Sciences, New Delhi; cross-sectional study.One hundred women with complaints vaginal discharge, irregular bleeding, post coital bleeding or unhealthy underwent...

We study asymptotically slowly varying perturbations of the AdS black brane in Einstein's gravity with a negative cosmological constant. allow both induced metric and Brown-York stress tensor at given radial cut-off slice to fluctuate. These fluctuations, which determine evolution metric, are parametrized terms boundary data. observe that renormalized energy-momentum any takes standard hydrodynamic form is relativistically covariant respect metric. The RG flow fluid field redefinitions...

We develop a semi-holographic model for the out-of-equilibrium dynamics during partonic stages of an ultrarelativistic heavy-ion collision. The combines weakly-coupled hard sector, involving gluon modes with energy and momenta order saturation momentum relatively large occupation numbers, strongly-coupled soft which physically represents gluons radiated by partons. sector is described perturbative QCD, more precisely, its semi-classical approximation (the classical Yang-Mills equations)...

A bstract Hybrid fluid models, consisting of two sectors with more weakly and strongly self-interacting degrees freedom coupled consistently as in the semi-holographic framework, have been shown to exhibit an attractor surface for Bjorken flow. Retaining only simple viscid descriptions both sectors, we find that, on surface, hydrodynamization times subsectors decrease increasing total energy density at respective point following a conformal scaling, reach their minimum values, subsequently...

We present an extended version of a recently proposed semi-holographic model for heavy-ion collisions, which includes self-consistent couplings between the Yang-Mills fields Color Glass Condensate framework and infrared AdS/CFT sector, such as to guarantee existence conserved energy-momentum tensor combined system that is local in space time, we also construct explicitly. Moreover, include coupling topological charge density glasma same holographic CFT. The approach makes it possible combine...

The quantum null energy condition (QNEC) is a lower bound on the energy-momentum tensor in terms of variation entanglement entropy subregion along direction. To gain insights into thermodynamics many-body systems, we study if QNEC restricts irreversible production quenches driven by inflow from an infinite memoryless bath two-dimensional holographic theories. We find that increase both and temperature, as implied Clausius inequality classical thermodynamics, necessary but not sufficient to...

A bstract We show that holographic RG flow can be defined precisely such it corresponds to emergence of spacetime. consider the case pure Einstein’s gravity with a negative cosmological constant in dual hydrodynamic regime. The is system first order differential equations for radial evolution energy-momentum tensor and variables which parametrize it’s phenomenological form on hypersurfaces foliation. constructed without explicit knowledge bulk metric provided hypersurface foliation special...

We derive a nonequilibrium fluctuation-dissipation relation for bosonic correlation functions from holography in the classical gravity approximation at strong coupling. This generalizes familiar thermal absence of external sources. also holds universally any state which can be obtained stable equilibrium perturbative derivative (hydrodynamic) and amplitude (nonhydrodynamic) expansions. Therefore, this provide experimental test applicability holographic framework. discuss how it tested...

Investigating principles for storage of quantum information at finite temperature with minimal need active error correction is an area research. We bear upon this question in two-dimensional holographic conformal field theories via the null energy condition that we have shown earlier to implement restrictions imposed by thermodynamics on such many-body systems. study explicit encoding a logical qubit into two similar chirally propagating excitations von Neumann entropy background whose...

We analyze some phenomenological implications of the most general semiholographic models for non-Fermi liquids that have emerged with inputs from holographic correspondence. find generalizations Landau-Silin equations few parameters governing thermodynamics, low-energy response, and collective excitations. show even when there is a Fermi surface well-defined quasiparticle excitations, excitations can behave very differently Landau's theory.

A bstract We extend our previous study of a toy model for coupling classical Yang-Mills equations describing overoccupied gluons at the saturation scale with strongly coupled infrared sector modeled by AdS/CFT. Including propagating modes in bulk we find that loses its initial energy to growing black hole gravity dual such there is conserved energy-momentum tensor total system while entropy grows monotonically. This involves numerical AdS simulation backreacted boundary source far from equilibrium.

Semiholography has been proposed as an effective nonperturbative framework which can consistently combine perturbative and effects for theories like QCD. It is postulated that the strongly coupled sector a holographic dual in form of classical gravity theory large N limit, fields determine gravitational boundary conditions. In this work, we pursue fundamental derivation particularly showing how physics by itself infrared, also interactions between sectors. We firstly demonstrate two sectors...

We investigate how the holographic correspondence can be reformulated as a generalization of Wilsonian renormalization group (RG) flow in strongly interacting large-$N$ quantum field theory. first define highly efficient RG one which Ward identities related to local conservation energy, momentum and charges preserve same form at each scale. To achieve this, it is necessary redefine background metric external sources scale functionals effective single-trace operators. These redefinitions also...

We develop holographic prescriptions for obtaining spectral functions in nonequilibrium states and space-time dependent shifts the energy spin of quasiparticle-like excitations. reproduce strongly coupled versions aspects dynamics Fermi surfaces Landau's Fermi-liquid theory. find that incoming wave boundary condition at horizon does not suffice to obtain a well-defined perturbative expansion observables. Our prescription, based on analysis regularity horizon, allows such be achieved...

Motivated by a semi-holographic approach to the dynamics of quark-gluon plasma which combines holographic and perturbative descriptions strongly coupled infrared more weakly ultraviolet sector, we construct hybrid two-fluid model where interactions between its two sectors are encoded their effective metric backgrounds, determined mutually energy-momentum tensors. We derive most general consistent ultralocal such that full system has total conserved tensor in flat Minkowski space study...