Hamiltonian formalism, master functions and Darboux transformations for perturbed (interiors and exteriors of) nonrotating black holesMotivated by their relevance to the interior of nonrotating black holes, classical and quantum Kantowski-Sachs cosmologies have recently attracted increasing attention. This interest has led to the…Michele Lenzi, Guillermo A. Mena Marugán, Andrés Mínguez-Sánchez et al.·May 19, 2026SaveLearn
Non-singular Inflation-Dark Energy Unification Model Based on Loop Quantum Cosmology and Mass-Varying NeutrinosUnifying the early-universe inflationary paradigm with late-time cosmic acceleration, while resolving the initial Big Bang singularity, remains one of the most profound challenges in modern…Zhiming Shuai, Xiangdong Zhang·May 19, 2026SaveLearn
Compact objects in AdS spacetime with exponential, quadratic and power-law bosonic mass profilesThis paper reports a study on the formation and physical characteristics of compacts stars in AdS spacetime within the framework of Bose-Einstein Condensate. Considering a Bose-Einstein condensate…Samprity Das, Aroonkumar Beesham, Surajit Chattopadhyay·May 19, 2026SaveLearn
Spin-Hair Induced Chaos of Spinning Test Particles in Rotating Hairy Black HolesWe investigate the finite-time instability of massive spinning test particles around a rotating hairy black hole generated through gravitational decoupling. The particle motion is described by the…Surojit Dalui, Xian-Hui Ge·May 19, 2026SaveLearn
On the nature of entangling photons in horizon-induced decoherenceRecently, it was discussed how the presence of a Killing horizon induces decoherence on a quantum system in a superposition of states. Focusing on the case of an electrically-charged system with…Max Joseph Fahn, Alessandro Pesci·May 19, 2026SaveLearn
Shadows and photon spheres of static black holes embedded in a Dehnen-(1,4,5/2)-type dark matter halo with a quintessential fieldThis paper investigates the appearance characteristics of static black holes embedded in Dehnen-(1,4,5/2)-type dark matter halos with a quintessential field, focusing on how the dark matter halo and…Hong-Er Gong, Junlin Qin, Yusen Wang et al.·May 19, 2026SaveLearn
Locality in effective field theory for inflationary soft modesThe gradient expansion and the separate universe approach provide an effective description of inflationary soft modes after coarse-graining shorter-wavelength degrees of freedom. We formulate a…Takahiro Tanaka, Yuko Urakawa·May 19, 2026SaveLearn
Image of a wormhole with an arbitrary throat profileWe investigate the observable signatures -- the shadow, the throat silhouette, and the image of a thin accretion disk -- for a family of static, spherically symmetric wormholes with an arbitrary…Valeria A. Ishkaeva, Sergey V. Sushkov·May 19, 2026SaveLearn
Modifications of CMB Temperature and Polarization Quadrupole Signals in Thurston SpacetimesRecent cosmological tests have discovered a fresh new set of anomalies in the large-scale isotropy of the universe. Motivated thus by the numerous pieces of evidence for large-scale cosmic isotropy…Tanay Gupta, Sukanta Panda, Rajib Saha·May 19, 2026SaveLearn
Quasinormal modes of massless scalar and electromagnetic perturbations for Euler-Heisenberg black holes surrounded by perfect fluid dark matterWe investigate the quasinormal modes of massless scalar and electromagnetic perturbations in charged Euler--Heisenberg black holes surrounded by perfect fluid dark matter. The quasinormal frequencies…Chengfu Feng, Sheng-Yuan Li, Xufen Zhang et al.·May 19, 2026SaveLearn
Cusp Formation in Merging Black Hole HorizonsAn important question in binary black hole mergers is to connect properties of the remnant black hole to those of the two initial black holes. These properties include not only the final mass and…Shilpa Kastha, Stamatis Vretinaris, Daniel Pook-Kolb et al.·May 19, 2026SaveLearn
Cylindrically Symmetric Black Holes Sourced by Dekel-Zhao Dark MatterIn this work, we obtain analytical solutions for a (3+1)-dimensional black string and a (2+1)-dimensional black hole, both sourced by the Dekel-Zhao dark matter (DM) density profile. Our results…G. Alencar, V. H. U. Borralho, M. S. Cunha et al.·May 19, 2026SaveLearn
Particle Production by Time-Varying Dark Energy and the End of Cosmic ExpansionWe consider various possible consequences of time-varying dark energy due to a quintessence scalar field whose energy density is partially converted to particles as the field evolves down its…Nicolas Patino, Paul J. Steinhardt·May 19, 2026SaveLearn
Revisiting black holes and their thermodynamics in Einstein-Kalb-Ramond gravityEinstein-Kalb-Ramond (EKR) gravity is an alternative theory in which a rank-two antisymmetric tensor field, the Kalb-Ramond field, is nonminimally coupled to gravity, potentially generating…Zhong-Xi Yu, Hong-Da Lyu, Mandula Huhe et al.·May 19, 2026SaveLearn
LISA as a probe of pre-big-bang physics: a nested sampling analysisUsing a nested sampling analysis, we study the gravitational-wave background (GWB) predicted by the Gasperini--Veneziano model of pre-big-bang cosmology, both in its most recent minimal and…Xoán Vilas Currás, Gianluca Calcagni·May 19, 2026SaveLearn
Graviton propagator in de Sitter space in a simple one-parameter gaugeWe construct the graviton propagator in de Sitter space in a one-parameter family of non-covariant gauges. This family generalizes the simple gauge in which most graviton loop computations in de…Dražen Glavan·May 19, 2026SaveLearn
Observational Tests of Regular Black Holes with Scalar Hair and their StabilityWe study the geodesic structure and observable properties of asymptotically flat regular black holes sourced by a phantom scalar field characterized by a scalar charge A. This parameter removes the…P. A. González, Marco Olivares, Eleftherios Papantonopoulos et al.·May 19, 2026SaveLearn
Spectrum of pure R2 gravity: full Hamiltonian analysisWe perform a full Hamiltonian constraint analysis of pure Ricci-scalar-squared (R2) gravity to clarify recent controversies regarding its particle spectrum. While it is well established that the…Will Barker, Dražen Glavan·May 19, 2026SaveLearn
The mechanism for creating "dynamical gravastar" black hole mimickers also explains formation of "little red dots"We argue that a high pressure phase transition of relativistic matter to a state with negative energy density, which leads to the formation of horizonless, globally unitary black hole mimickers, also…Stephen L. Adler·May 19, 2026SaveLearn
Connecting Early Dark Energy to Late Dark Energy by the Diluting Matter PotentialIn this work we study a scale invariant gravity theory containing two scalar fields, dust particles and a measure defined from degrees of freedom independent of the metric. The integration of the…Eduardo I. Guendelman, Ramon Herrera, Pedro Labrana·May 19, 2026SaveLearn
Quantum Response of a Harmonically Trapped Detector to Classical and Non-classical Gravitational FieldsIn this work, we study the response of a detector confined in a harmonic oscillator potential when interacting with classical and quantum gravitational fields. The detector response is characterized…Anom Trenggana, Freddy P. Zen, Seramika Ariwahjoedi·May 19, 2026SaveLearn
Neutron stars more compact than black holes as a probe of strong-field gravityProbing gravity in its strongest regime is a central goal of modern physics, as the nature of the most compact objects reflects fundamental aspects of Einstein's theory of general relativity…Shoulong Li, H. Lü, Yong Gao et al.·May 19, 2026SaveLearn
Testing Black Holes with Interstellar Missions: I. Orbiting ProbesRecently, we showed that the possibility of an interstellar mission to the closest black hole, while highly speculative and extremely challenging, is not completely unrealistic within the next few…Leda Gao, Cosimo Bambi, Yi Fan et al.·May 18, 2026SaveLearn
GstLAL O4 Online Results PaperGravitational-wave observations of merging binary neutron stars and black holes are now routinely made by detectors in the Advanced LIGO-Virgo-KAGRA network. Neutron star binary systems may also…Shomik Adhicary, Pratyusava Baral, Amanda Baylor et al.·May 18, 2026SaveLearn
Ringdown Signatures of Dehnen Dark Matter Halos: Fluid Modes and Detectability with Space-Based DetectorsIn this work, we investigate the feasibility of using ringdown waveforms from supermassive black holes immersed in dark-matter halos to extract both the intrinsic black-hole parameters and those…Manjia Liang, Minghui Du, Qing Diao et al.·May 18, 2026SaveLearn