We investigate the quasinormal mode (QNM) spectra for scalar and electromagnetic fields over a covariant loop quantum gravity (LQG) black hole. For fundamental modes, LQG effect reduces oscillations in field, however, it induces stronger field compared to classical case. Under perturbation, system enjoys faster decaying modes with more than field. Some peculiar phenomena emerge QNM higher overtones. A notable feature is substantial divergence observed first several overtones from their...

We construct the simplest gravitational dual model of a superconductor on Q-lattices. analyze condition for existence critical temperature at which charged scalar field will condense. In contrast to holographic ionic lattices, presence Q-lattices suppress condensate and lower temperature. particular, when Q-lattice background is deep insulating phase, condensation would never occur some small charges. Furthermore, we numerically compute optical conductivity in superconducting regime. It...

We investigate the holographic entanglement entropy (HEE) of a strip geometry in four dimensional Q-lattice backgrounds, which exhibit metal-insulator transitions dual field theory. Remarkably, we find that HEE always displays peak vicinity quantum critical points. Our model provides first direct evidence can be used to characterize phase transition (QPT). also conjecture maximization behavior at points would universal general models.

A bstract Recently, the reflected entropy is proposed in holographic approach to describe entanglement of a bipartite quantum system mixed state, which identified as area minimal surface inside wedge. In this paper, we study doubly setup, contains degrees freedom matter bulk. context, propose notion wedge cross-section, may with higher-order corrections. We numerically compute pure AdS background and black hole four dimensions, respectively. general, contribution from geometry on brane CFT....

We introduce a Weyl term into the Einstein-Maxwell-Axion theory in four dimensional spacetime. Up to first order of coupling parameter $\gamma$, we construct charged black brane solutions without translational invariance perturbative manner. Among all holographic frameworks involving higher derivative gravity, are obtain metal-insulator transitions (MIT) when varying system parameters at zero temperature. Furthermore, study entanglement entropy (HEE) strip geometry this model and find that...

The entanglement exhibits extremal or singular behavior near quantum critical points (QCPs) in many condensed matter models. These intriguing phenomena, however, still call for a widely accepted understanding. In this paper we study issue holographic framework. We investigate the connection between entropy (HEE) and phase transition (QPT) lattice-deformed Einstein-Maxwell-Dilaton theory. Novel backgrounds exhibiting metal-insulator transitions (MIT) have been constructed which both metallic...

We study the time evolution of test scalar and electromagnetic fields perturbations in configurations phantom wormholes surrounded by dark energy with state parameter $\omega< -1$. observe obvious signals echoes reflecting properties disclose physical reasons behind such phenomena. In particular, we find that equation has a clear imprint wave perturbations. When $\omega$ approaches divide $\omega=-1$ from below, delay becomes longer. The echo gravitational is likely to be detected near...

We investigate the scalar field system over a charged Weyl black hole, depicted by parameter $\ensuremath{\lambda}$. It is found that imaginary part of quasinormal mode spectra always negative and perturbation does not increase with time, indicating stable under perturbation. Furthermore, Hawking radiation exhibit qualitatively similar characteristic in they both rise rising $\ensuremath{\lambda}$ approach constant when large enough. Especially, we would like to emphasize an exponential...

Abstract This study presents a comprehensive investigation of anisotropy in holographic p-wave superconductor model, revealing novel insights into the behavior quantum information strongly coupled systems. Through rigorous semi-analytical methods, we uncover existence an isotropic point emerging at critical temperature $$T_{II},$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>T</mml:mi> <mml:mi>II</mml:mi> </mml:mrow> </mml:msub> <mml:mo>,</mml:mo>...

A bstract We construct a holographic model to study the striped superconductor on ionic lattices. This features phase diagram with three distinct phases, namely charge density wave (CDW) phase, ordinary superconducting (SC) and (SSC). The effect of lattices is investigated in detail. First, due periodic nature background, different types CDW solutions can be found below critical temperature. Furthermore, increase lattice amplitude these are locked commensurate states. Second, we find that...

Using a sample of 246 metal-poor stars (RR Lyraes, red giants, and horizontal branch stars) which is remarkable for the accuracy its six-dimensional kinematical data, we find, by examining distribution stellar orbital angular momenta, new component local halo has an axial ratio c/a ∼ 0.2, similar flattening to thick disk. It small prograde rotation but supported velocity anisotropy, contains more intermediate-metallicity (with −1.5 < [Fe/H] −1.0) than rest our sample. We suggest that this...

When the Lyapunov exponent λL in a quantum chaotic system saturates bound ≤ 2πk B T , it is proposed that this has holographic dual described by gravity theory. In particular, butterfly effect as prominent phenomenon of chaos can ubiquitously exist black hole characterized shockwave solution near horizon. paper we propose velocity be used to diagnose phase transition (QPT) theories. We provide evidences for proposal with an anisotropic model exhibiting metal-insulator transitions (MIT),...

In mammalian corneal epithelium, mitosis shows a distinct circadian pattern. However, how this pattern is maintained, and it or its disruption influence renewal regeneration remain unclear.C57BL/6 mice were maintained under 12-hour light/12-hour dark (LD), light (LL), dark/12-hour (DD), reversed LD (DL, light; jet-lag defined as shift of 12 hours) conditions. Mitotic cells in epithelium enumerated analyzed via immunofluorescence at different zeitgeber times (ZTs). Expression core clock genes...

In this note we remark that the butterfly effect can be used to diagnose phase transition of superconductivity in a holographic framework. Specifically, compute velocity charged black hole background as well anisotropic backgrounds with Q-lattice structure. both cases find its derivative temperature is discontinuous at critical points. We also propose signalize occurrence thermal general models.

We construct a bulk geometry with Q-lattice structure, which is implemented by two gauge fields and coupling between the lattice Maxwell field. This gravity dual model can describe novel insulator exhibits some key features analogous to Mott insulator. In particular, hard gap in insulating phase as well vanishing DC conductivity be simultaneously achieved. addition, we discuss non-Drude behavior of optical low frequency region phase, characteristics different from ordinary

A bstract The holographic entanglement of purification (EoP) in AdS 4 and AdS-RN black hole backgrounds is studied. We develop an algorithm to compute the EoP for bipartite configuration with infinitely long strips. temperature behavior revealed small, intermediate large configurations: monotonically increases small configurations; while configurations, configuration-dependent; vanishes configurations. Our numerical results verify some important inequalities EoP, which we also prove...

We study the fully nonlinear dynamics of black hole spontaneous scalarizations in Einstein-Maxwell scalar theory with coupling function $f(\phi)=e^{-b\phi^{2}}$, which can transform usual Reissner-Nordstr\"om Anti-de Sitter (RN-AdS) holes into hairy holes. Fixing Arnowitt-Deser-Misner mass system, initial perturbation will destroy original RN-AdS and turn it a provided that constant $-b$ charge are sufficiently large, while cosmological is small enough. In scalarization process, we observe...

We study the quasi-normal modes of charged scalar perturbations in background Einstein-Maxwell-aether black hole through three methods (WKB method, continued fraction generalized eigenvalue method). Then we propose specific treatment for effective potential with $\omega$-dependence and complete procedure transforming calculation method into finding zero point corresponding complex function numerically. These are valid because results from different consistent. also investigate allowed region...

We study the lensing effects of Kerr-Newman (KN) black holes and multi-level images luminous sources around holes. obtain analytic forms lens equations in KN spacetime derive approximately their limiting for photon emissions near bounded orbits. After deriving expressions three key parameters $\gamma$, $\delta$ $\tau$, we investigate primary, secondary higher-order spherical equatorial disk-like sources. In particular, find that charge hole has a significant effect on images.

We construct a holographic model in the framework of Q-lattices whose dual exhibits metal-insulator transitions. By introducing an interacting term between Q-lattice and electromagnetic field bulk geometry, we find such kind transition can be Mott-like. The evidences are presented as follows. (i) from metallic phase to insulating occurs when lattice constant becomes larger. (ii) A hard gap manifestly observed optical conductivity. Nevertheless, zero temperature limit this novel behavior,...

Abstract The mechanisms of corneal epithelial lesions and delayed wound repair, as well their association with diabetes mellitus, are critical issues for clinical ophthalmologists. To test whether the diabetic condition alters circadian rhythm in a mouse cornea insulin can synchronise clock, we studied effects streptozotocin-induced on mitosis cells, recruitment leukocytes to cornea, expression main core clock genes ( Clock , Bmal1 Per2 Cry1 Rev-erbα ) epithelium. We also assessed possible...

Abstract We study the mixed state entanglement in a holographic axion model. find that entropy (HEE), mutual information (MI) and of purification (EoP) exhibit very distinct behaviors with system parameters. The HEE exhibits universal monotonic behavior parameters, while MI EoP relate to specific parameters configurations. can characterize better than since they are less affected by thermal effects. Specifically, partly cancels out contribution, is not dictated any situation. Moreover, we...

We construct a neural network to learn the Reissner-Nordstr\"om-anti--de Sitter black hole metric based on data of optical conductivity by holography. The linear perturbative equation for Maxwell field is rewritten in terms such that constructed discretization this differential equation. In contrast all previous models anti--de Sitter/deep learning duality, derivative function appears motion and we propose distinct finite difference methods discretize function. notion reduced also proposed...

We construct a holographic model for fermionic system on Q-lattice and compute the spectral function in presence of dipole coupling. Both key features doped Mott insulators, dynamical generation gap weight transfer, are observed when adjusting value coupling parameter $p$. Of particular interest is that background deep insulating phase, opens much easier with smaller comparison metallic background. The effects lattice parameters width $Δ/μ$ studied turning point near critical regime...