Quadrupolar bremsstrahlung waveform at the third-and-a-half post-Newtonian accuracyWe study the quadrupolar part of the gravitational waveform hij (encoded in the helicity-(-2) radiative quadrupole moment $U2 = 12! mi mj Ui j ∈R4G…Donato Bini, Thibault Damour, Andrea Geralico·Apr 23, 2026SaveLearn
A Study of Non-Singular Bounce in Myrzakulov-type f(R,T) Gravity with Chaplygin GasThis study investigates the non-singular bounce within the framework of Myrzakulov-type f(R,T) = R + αT + βT2 gravity by adopting a Chaplygin gas equation of state. We employ two methodologies: a…Khandro K Chokyi, Abdel Nasser Tawfik, Surajit Chattopadhyay·Apr 23, 2026SaveLearn
Gravitational Collapse of a Chiellini Integrable Scalar FieldWe study the gravitational collapse of a non-interacting mix of perfect fluid and a spatially homogeneous scalar field within a Chiellini-integrable framework. We choose an extended Higgs-type…Mohamed Aarif A, Soumya Chakrabarti·Apr 23, 2026SaveLearn
Phase transition structure of scalarized neutron stars: the effect of rotation and linear couplingThere has been a recent revival in understanding the spontaneous scalarization phenomenon in scalar-tensor gravity as a phase transition. Using the tools of the Landau theory, we now know that…Kalin V. Staykov, Fethi M. Ramazanoğlu, Daniela D. Doneva et al.·Apr 23, 2026SaveLearn
Calculation of a regularized Teukolsky Green function in Schwarzschild spacetimeWe obtain exact expressions for various factors involved in the Hadamard form of the retarded Green function for the (Bardeen-Press-)Teukolsky equation on Schwarzschild spacetime. We use these to…David Q. Aruquipa, Marc Casals, Brien C. Nolan·Apr 23, 2026SaveLearn
Dynamical systems approach to stellar modelling in f(G, B) gravityThe novel proposal to invoke the split of the Ricci scalar into bulk and boundary terms in the gravitational action, opens up a new avenue of investigation into stellar dynamics. The Lagrangian…Sudan Hansraj, Christian G. Boehmer, Ndumiso Buthelezi·Apr 23, 2026SaveLearn
Dynamical response of twin stars to perturbationsIf a strong first-order phase transition takes place at sufficiently high rest-mass densities in the equation of state (EOS) modelling compact stars, a new branch will appear in the mass-radius…Shamim Haque, Luciano Rezzolla, Ritam Mallick·Apr 23, 2026SaveLearn
3-dimensional charged black holes in f(Q) gravityWe present new exact charged black hole solutions in (2+1) dimensions within the framework of f(Q) gravity, where Q denotes the non-metricity scalar. By considering a cubic f(Q) form we…G. G. L. Nashed, Emmanuel N. Saridakis·Apr 23, 2026SaveLearn
Full spacetime inversion generated by electromagnetic Abelian gauge transformationsIn a previous manuscript we addressed the possibility of generating a reflection in a region of spacetime inside a null surface under electromagnetic gauge transformations. In this manuscript we will…Alcides Garat·Apr 22, 2026SaveLearn
The f(Q, T) gravity and affine EoS: observational aspectsIn this paper, we investigate the cosmic expansion scenarios within the framework of f(Q,T) gravity by using the affine equation of state (EoS) parameter. Specifically, we consider the linear form…Romanshu Garg, G. P. Singh·Apr 22, 2026SaveLearn
Unruh-DeWitt Detector Response in Toroidal SpacetimeThe global topology of spacetime, though invisible to local curvature measurements, leaves signatures on the correlation functions of quantum fields. We study these signatures using an Unruh-DeWitt…Nirmalya Kajuri, Sheeshram Siddh·Apr 22, 2026SaveLearn
Radial adiabatic perturbations of stellar compact objectsWe present a covariant and gauge-invariant formulation of the theory of radial adiabatic linear perturbations of self-gravitating, non-dissipative imperfect fluids within the theory of general…Paulo Luz, Sante Carloni·Apr 22, 2026SaveLearn
Smoking Gun Signatures of Quasilocal Probability in Black Hole RingdownsBuilding on recent work introducing the idea of Quasilocal Probability in curved spacetime, we develop its observational implications for black hole ringdown in detail. We show that horizon-induced…Oem Trivedi, Alfredo Gurrola, Robert J. Scherrer·Apr 22, 2026SaveLearn
Cracking Gravitational Wave Multiple Ringdown Modes in SpaceRingdown signals from perturbed black holes (BHs) offer a clean window into BH spacetime, strong-field gravity, and fundamental physics. Presently the quasi-normal modes of stellar-mass BH ringdowns…Ziming Wang, Han Wang, Yuxin Yang et al.·Apr 22, 2026SaveLearn
Geodesic Completeness in General Cosmological ScenariosThe well-known Borde-Guth-Vilenkin Theorem shows that inflationary spacetimes are generically geodesically past-incomplete, necessitating the existence of a pre-inflationary boundary of some sort,…William H. Kinney·Apr 22, 2026SaveLearn
General Relativity via differential forms -- explorations in Plebanski's Formalism for GRThis thesis studies general relativity (GR) using chiral formulations, which take advantage of the decomposition of the four-dimensional Lorentz group into self-dual and anti-self-dual sectors.…Adam Shaw·Apr 22, 2026SaveLearn
Time Like Geodesics of Regular Black Holes with Scalar HairWe investigate timelike geodesics in asymptotically flat regular black holes supported by a phantom scalar field characterized by a scalar charge A. This parameter removes the central singularity…P. A. González, Marco Olivares, Eleftherios Papantonopoulos et al.·Apr 22, 2026SaveLearn
Time evolution of a Nambu-Goto string coiling around a Kerr black holeThe interaction between a Nambu-Goto string and a Kerr black hole gives one of the methods of energy extraction from a rotating black hole. Although the properties of such processes have been well…Hirotaka Yoshino, Kousuke Tanaka·Apr 22, 2026SaveLearn
Astrophysically Realistic Secondary Spins Trigger Chaos in Schwarzschild Spacetime and Discernible Gravitational Wave SignaturesChaos in extreme-mass-ratio inspirals is often thought to require unrealistically large secondary spins, making its astrophysical relevance uncertain. However, we find that chaos persists across the…Dan-Dan Yuan, Jia-Geng Jiao, Yu-Qi Lei et al.·Apr 22, 2026SaveLearn
Quantum description of gravitational waves generated by a classical sourceWe investigate the quantum properties of gravitational waves (GWs) generated by a classical energy-momentum tensor. Treating the GW field as a quantum field coupled to a classical source, we evaluate…Felix Laga, Teruaki Suyama·Apr 22, 2026SaveLearn
Thermodynamics and phase transitions of nonlinearly scalarized black holes in Einstein-scalar-Gauss-Bonnet theoryWe investigate the thermodynamic properties of static nonlinearly scalarized black holes in Einstein-scalar-Gauss-Bonnet theory with polynomial coupling functions. Based on the scalarized solutions…De-Cheng Zou, Xu Yang, Meng-Yun Lai et al.·Apr 22, 2026SaveLearn
Spontaneous wave function collapse from non-local gravitational self-energyWe incorporate non-local gravitational self-energy, motivated by string-inspired T-duality, into the Schrödinger-Newton equation. In this framework spacetime has an intrinsic non-locality, rendering…Kimet Jusufi, Douglas Singleton, Francisco S. N. Lobo·Apr 22, 2026SaveLearn
Quasinormal modes of charged covariant effective black holes with a cosmological constantIn this paper, we investigate the quasinormal modes of two covariant effective black holes characterized by the quantum parameter ζ, charge Q, and cosmological constant Λ, under the scalar…Zhongzhinan Dong, Jinsong Yang·Apr 21, 2026SaveLearn
Two-Point Padé Approximants for the Deflection of Light in the Schwarzschild Black Hole MetricThe deflection angle of a light ray passing the Schwarzschild (spherically symmetric vacuum) black hole was calculated by Charles Galton Darwin in 1959 in terms of the elliptic integral of the first…Don N. Page·Apr 21, 2026SaveLearn
Cosmology of the interacting Tsallis holographic dark energy in f(R,T) gravity frameworkIn this work, we have analyzed the cosmology of the Tsallis holographic dark energy (THDE), a particular case of Nojiri-Odintsov HDE proposed in [S. Nojiri and S. D. Odintsov, Gen. Relativ.…Sanjeeda Sultana, Chayan Ranjit, Surajit Chattopadhyay et al.·Apr 21, 2026SaveLearn