We study the thermodynamics of $D$-dimensional Born-Infeld AdS black holes in extended phase space. find that usual small-large hole transition, which exhibits analogy with Van de Waals liquid-gas system holds all dimensions greater than three. However, different from four-dimensional case, higher dimensional there is no reentrant transition. For three-dimensional AS hole, does not exist critical phenomena.

We find a new instability in the four-dimensional Reissner-Nordstr\"om--de Sitter black holes against charged scalar perturbations with vanishing angular momentum, $l=0$. show that such an is caused by superradiance. The does not occur for larger index, as explicitly proved $l=1$. Our results are obtained from numerical investigation of time-domain profiles perturbations.

A bstract We study the evolution of holographic subregion complexity under a thermal quench in this paper. From CV proposal AdS/CFT correspondence, CFT is holographically captured by volume codimension-one surface enclosed codimension-two extremal entanglement and boundary subregion. Under quench, dual gravitational configuration described Vaidya-AdS spacetime. In case we find that always increases at early time, after reaching maximum it decreases gets to saturation. Moreover notice when...

A bstract We investigated the superradiance and stability of regularized 4D charged Einstein-Gauss-Bonnet black hole which is recently inspired by Glavan Lin [Phys. Rev. Lett. 124, 081301 (2020)]. found that positive Gauss-Bonnet coupling constant α enhances superradiance, while negative suppresses it. The condition for superradiant instability proved. also worked out quasinormal modes (QNMs) real part all QNMs does not satisfy imaginary parts are negative. Therefore this stable. When makes...

Recently, Comisso and Asenjo proposed a novel mechanism for harnessing energy from black holes through magnetic reconnection. Our study focuses on exploring the utilization of this Konoplya-Rezzolla-Zhidenko (KRZ) parametrized to assess impact deformation parameters extraction. Among various parameters, ${{\ensuremath{\delta}}_{1},{\ensuremath{\delta}}_{2}}$ are identified as most important factors affecting physics under consideration. The influence these two ergoregion, circular geodesics...

We investigated the superradiance and stability of novel 4D charged Einstein-Gauss-Bonnet black hole which is recently inspired by Glavan Lin [Phys. Rev. Lett. 124, 081301 (2020)]. found that positive Gauss-Bonnet coupling consant $α$ enhances superradiance, while negative suppresses it. The condition for superradiant instability proved. also worked out quasinormal modes (QNMs) real part all QNMs live beyond imaginary parts are negative. Therefore this stable. When makes extremal, there normal modes.

Scalar-tensor gravity, with the screening mechanisms to avoid severe constraints of fifth force in Solar System, can be described a unified theoretical framework, so-called screened modified gravity (SMG). Within this paper we calculate waveforms gravitational-waves (GWs) emitted by inspiral compact binaries, which include four polarization modes, plus ${h}_{+}$, cross ${h}_{\ifmmode\times\else\texttimes\fi{}}$, breathing ${h}_{b}$, and longitudinal ${h}_{L}$ modes. The scalar polarizations...

Scalar perturbations around the Kerr black hole in scalar-Einstein-Gauss-Bonnet (sEGB) theory are studied time domain. To overcome "outer boundary problem" that usually encountered traditional numerical calculations, we apply hyperboloidal compactification technique to perform a $(2+1)$-dimensional simulation aiming obtain precise object picture of wave propagation under scalar field perturbation. We find big enough coupling constant between and Gauss-Bonnet curvature is responsible destroy...

Acentric compounds with a layered structure are of current interest owing to their advanced functional properties for technical applications. However, the growth bulk single crystals acentric materials quasi-two-dimensional is challenging, which severely hinders intrinsic investigation and optoelectronic applications these materials. Herein, we report controlled CdTeMoO6 linear nonlinear optical properties. High quality dimensions ∼26 × 10 9 mm3 were successfully grown through modified...

Gravitationally bound hierarchies containing three or more components are very common in our Universe. In this paper we study the periodic gravitational wave (GW) form, its polarizations, response function, Fourier transform, and energy loss rate of a triple system through different channels radiation, scalar, vector, tensor modes, Einstein-aether theory gravity. The violates locally Lorentz symmetry, yet satisfies all theoretical observational constraints by properly choosing four coupling...

Abstract In the framework of dynamical Chern–Simons gravity, we study scalar field perturbations Reissner–Nordström–Melvin spacetime, which describes a charged black hole permeated by uniform magnetic field. presence field, acquires an effective mass whose square takes negative value in half domain angular direction. This inevitably introduces tachyonic instability and associated spontaneous scalarization as long coupling constant between invariant exceeds threshold value. We object pictures...

Abstract The Comisso-Asenjo mechanism is a novel proposed recently to extract energy from black holes through magnetic reconnection of the surrounding charged plasma, in which field plays crucial role. In this work, we revisit process by taking into account backreaction on hole's geometry. We employ Kerr-Melvin metric describe local near-horizon geometry magnetized hole. By analyzing circular orbits equatorial plane, extraction conditions, power and efficiency extraction, found that while...

We examine the stability of Garfinkle-Horowitz-Strominger (GHS) black hole under charged scalar perturbations. find that different from neutral field perturbations, only two numerical methods, such as continued fraction method and asymptotic iteration method, can keep high efficiency accuracy requirements in frequency domain computations. The comparisons between these methods have also been done. Employing appropriate we show GHS is always stable against This result obtained de Sitter...

We study the dual fluid on a finite cutoff surface outside black brane horizon in third order Lovelock gravity. Using nonrelativistic long-wavelength expansion, we obtain incompressible Navier-Stokes equations of with external force density surface. The viscosity to entropy ratio $\eta/s$ is independent and does not get modification from gravity influence. obtained agrees results by using other methods, such as Kubo formula at AdS boundary membrane paradigm These can be related Wilson...

We investigate the behavior of entanglement entropy in holographic QCD model proposed by Gubser et al. By choosing suitable parameters scalar self-interaction potential, this can exhibit various types phase structures: crossover, first order and second transitions. use to probe crossover/phase transition, find that it drops quickly/suddenly when temperature approaches critical point which be seen as a signal confinement. Moreover, suggests we may characterize corresponding structures.

We investigate in detail the mechanism of superradiance to render instability Kerr-de Sitter black holes scalar-tensor gravity. Our results provide more clues examine gravity astrophysical universe with cosmological constant. also discuss spontaneous scalarization de background and find that this can happen spherical configuration a special style.

Received 21 August 2014DOI:https://doi.org/10.1103/PhysRevD.90.049904© 2014 American Physical Society

We study holographic thermalization in spacetimes with a chemical potential and non-trivial dilaton field. Three non-local observables are used to probe the whole process investigate effect of ratio over temperature χ dilaton-Maxwell coupling constant α. It is found that saturation time not always monotonically increasing function χ, situation depends on When 0≤α≤1, larger yields longer time, while for α>1, becomes more complex. More interesting, we although α indeed has influence process,...

Applying the "Complexity=Action" conjecture, we study holographic complexity close to crossover/phase transition in a QCD model proposed by Gubser et al. This can realize three types of phase transition, crossover or first and second order, depending on parameters dilaton potential. The re-scaled late-time growth rate density for cases is calculated. Our results show that it experiences fast drop/jump critical point while approaching constants far beyond temperature. Moreover, temperature,...

In this paper, we systematically study spherically symmetric static spacetimes in the framework of Einstein-aether theory and pay particular attention to existence black holes (BHs). theory, two additional gravitational modes (one scalar one vector) appear, due presence a timelike aether field. To avoid vacuum gravi-\ifmmode \check{C}\else \v{C}\fi{}erenkov radiation, they must all propagate with speeds greater than or at least equal speed light. spherical case, only mode is relevant, so BH...

Background: Changes in the amplitude of low-frequency fluctuations (ALFF) and fractional (fALFF) have provided stronger evidence for pathophysiology cognitive impairment. Whether altered patterns ALFF fALFF differ amnestic impairment (aMCI) vascular mild (vMCI) is largely unknown. The purpose this study was to explore ALFF/fALFF changes two diseases further whether they contribute diagnosis differentiation these diseases. Methods: We searched PubMed, Ovid, Web Science databases articles on...

Abstract In the framework of Einstein’s gravity coupled to nonlinear electromagnetic fields, we study gravito-electromagnetic perturbations magnetic regular black holes (BHs). The master equations are obtained through Chandrasekhar’s formulation, from which it can be seen, different electric counterparts, for BHs gravitational with odd-parity only even-parity. We solve numerically and obtain quasinormal modes (QNMs) three typical BHs. Results show that QNMs distinct differ significantly,...

Plasma activates inert phosphorous vapour to prepare nickel phosphide nanosheets at mild temperature for hydrogen evolution from water electrolysis.

Multicomponent NH₃ plasma enhances the carbon removal effect and activates red phosphorus to PH radicals, resulting in simultaneous MOF decomposition phosphorization at low temperature.