Damghan University PressJournal of Holography Applications in Physics2783-47785420251023Electric Forces in the Charged SYK Model126192010.22128/jhap.2025.3068.1137ENLeonard SusskindStanford Institute for Theoretical Physics and Department of Physics, Stanford University, Stanford, CA
94305–4060, USA and Sandbox@Alphabet, Mountain View, CAJournal Article20250920The connection between gravitational force and operator growth, reported in earlier papers, is generalized to include electromagnetic forces. It is shown how in the U(1)-invariant SYK system electric forces emerge through the same mechanisms---the momentum-size correspondence, and operator growth--- that give rise to gravitational force. The unit of electric charge implied by the U(1)-SYK theory is consistent with a Kaluza-Klein radius inverse to the characteristic energy scale of the SYK theory.https://jhap.du.ac.ir/article_1920_5ca1ccb56e53bd9d6c7eb47478899e3d.pdfDamghan University PressJournal of Holography Applications in Physics2783-47785420251023Mimetic Black Holes in Einstein-Scalar-Gauss-Bonnet Gravity2749190310.22128/jhap.2025.3008.1127ENMaryam SadeghiDepartment of Theoretical Physics, Faculty of Basic Sciences, University of Mazandaran, P.O.Box-47416-95447, Babolsar, Iran0009-0002-3329-2655Kourosh NozariDepartment of Theoretical Physics, Faculty of Basic Sciences, University of Mazandaran, P. O. Box-47416-95447, Babolsar, Iran0000-0003-4368-5823Journal Article20250803In this paper, we try to extend the intriguing concept of mimetic black holes to the realm of the Gauss-Bonnet Gravity. Mimetic black holes are a fascinating theoretical construct that mimic the exterior gravitational field of known black holes even without possessing an event horizon in some specific conditions. By incorporating the Gauss-Bonnet theory, we aim to investigate how the dynamics and properties of mimetic black holes are altered in this modified gravitational framework. In this particular setting, we explore the existence of black hole solutions with nontrivial scalar hair while being influenced by the mimetic scalar field in the Einstein Scalar-Gauss-Bonnet (ESGB) theory. These solutions are characterized by their regularity and offer new insights into the dynamics of black holes in this theory. We proceed by conducting an analytical study in the near horizon asymptotic regime when an event horizon cab be existed. Our analysis reveals that in this setup a black hole event horizon with a nontrivial hair can be formed, regardless of the sign of the Lagrange multipliers λ, depending on the particular selection of the coupling between the scalar field and the Gauss-Bonnet term. Notably, this black hole horizon remains regular, emphasizing the robustness of the black hole solutions in this setup.https://jhap.du.ac.ir/article_1903_50fcda01c8111582d98695acb16b1294.pdfDamghan University PressJournal of Holography Applications in Physics2783-47785420251023The Effects of Pole Dark Energy on Gravitational Waves5067190410.22128/jhap.2025.3013.1128ENHoma ShababiCenter for Theoretical Physics, College of Physical Science and Technology, Sichuan University, Chengdu 610065, People’s Republic of China.Prabir RudraDepartment of Mathematics, Asutosh College, Kolkata-700 026, W. B., IndiaSayani MaityDepartment of Mathematics, Sister Nivedita University, DG-1/2, Action Area 1, New Town, Kolkata-700 156, IndiaUjjal DebnathDepartment of Mathematics, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711 103, IndiaJournal Article20250810In this paper, we have studied the effects of pole dark energy on the evolution of gravitational waves. The background evolution of gravitational waves in a flat FRW universe is considered, and its dynamics are studied in the presence of pole dark energy. Two different potential functions are considered for the study. Using the field equations, we formulated the perturbed equations governing the evolution of gravitational waves with respect to redshift $z$ within the background of the FRW Universe. Subsequently, we delved into the characteristics of gravitational waves for the pole dark energy model and reached interesting results. We also probed the evolution of the gravitational waves for a universe driven by a cosmological constant and used it as a comparison for the results obtained for pole dark energy. From the analysis, we see that pole dark energy is superior as a dark energy model in driving the spacetime disturbances, compared to a cosmological constant.https://jhap.du.ac.ir/article_1904_e608642f90c669a9fb92fe6a5ebd5cad.pdfDamghan University PressJournal of Holography Applications in Physics2783-47785420251023Freelance Holography6881190810.22128/jhap.2025.3018.1129ENVahid TaghilooSchool of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395–5531, Tehran,
Iran;
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), P.O. Box 45137–66731,
Zanjan, Iran0000-0003-4563-7788Journal Article20250814In this paper, we introduce the Freelance Holography Program, an extension of the AdS/CFT correspondence within the saddle-point approximation that opens several novel directions. This framework generalizes holography beyond the asymptotic AdS boundary, allowing it to be formulated on arbitrary timelike hypersurfaces in the bulk. Moreover, it accommodates arbitrary boundary conditions for bulk fields, moving beyond the standard Dirichlet prescription. As part of this development, we construct a one-parameter family of renormalized boundary conditions that, unlike conventional choices in the literature, lead to a finite on-shell action. We also explore intriguing consequences of the framework, including the emergence of induced gravity and the flow of boundary conditions under holographic renormalization.https://jhap.du.ac.ir/article_1908_1e5cec77c9e8ea9febbe16730c3b8bb3.pdfDamghan University PressJournal of Holography Applications in Physics2783-47785420251023The BTZ Black Hole, Thermofield Double State, and SPT Phases: A Duality8294191510.22128/jhap.2025.3023.1131ENFabiano Francisco Dos SantosCentro de Ciências Exatas, Naturais e Tecnológicas, UEMASUL, 65901-480, Imperatriz, MA, Brazil0000-0001-5473-8797Journal Article20250819This letter present an investigation of the relationship between the interior and exterior solutions of the BTZ black hole, emphasizing the effects of interchanging spatial and temporal roles. By deriving the interior BTZ metric and its associated thermofield double state, we uncover a duality that complements the exterior solution, providing a comprehensive perspective on the full BTZ black hole geometry. The bulk partition function is shown to correspond to a non-orientable spacetime, specifically a Klein bottle, which establishes links to symmetry-protected topological (SPT) phases characterized by orientation-reversing symmetries. These results align with recent developments in understanding entanglement and topological phases in non-orientable geometries, as well as the role of thermofield double states in the AdS/CFT framework. This work bridges black hole physics, quantum entanglement, and topological invariants, offering fresh insights into the geometric and physical properties of non-orientable spacetimes.https://jhap.du.ac.ir/article_1915_86c343e0f7cc13f331d0b630fc1f21de.pdfDamghan University PressJournal of Holography Applications in Physics2783-47785420251023Holographic Dark Energy Models in FRW Universe from Parametrization of q with f(Q,T) Gravity95115191910.22128/jhap.2025.3054.1134ENPrerna MandarParkhiDepartment of Mathematics, PGTD, RTMN University, Nagpur, Maharashtra 440033, India0000-0001-5872-873XShubha SKotambkarLaxminarayan Innovation Technological University, Nagpur, Maharashtra 440033, India0000-0001-8982-8768Journal Article20250909In this paper, we study the {Holographic Dark Energy (HDE)} cosmological models within the f(Q,T) gravity framework. Here, Q and T represent the non-metricity scalar and energy-momentum tensor trace, respectively. In order to find the solutions in the Friedman-Robertson-Walker model, we use the deceleration parameter q(z) and describe the transiting universe evolution and the Hubble parameter. We obtain the constraints on model parameters using {Markov Chain Monte Carlo (MCMC)} analysis with the supernovae type Ia observations from the Pantheon sample. We further investigate the cosmological parameters like the energy density, equation of state parameter, and classical stability parameter in terms of redshift with the physically plausible f(Q,T)=μ Q +υ T form. We investigate three HDE models in this framework with different IR cutoffs. The distinct cosmological evolution scenarios have been studied with the cosmographic parameters.https://jhap.du.ac.ir/article_1919_648eb82cf2dec0e3bb9e9732ceeaa2fa.pdf