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General Relativity and Quantum Cosmology papers — page 133

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Resolution of the cosmological constant problem by unimodular gravity and signature reversal symmetry
The (old) cosmological constant problem consists of two different problems. The first is the huge discrepancy between the value of the cosmological constant deduced from observations and its value…
Recai ErdemMar 31, 2026
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Big bang stability and isotropisation for the Einstein-scalar field equations in the ekpyrotic regime
It has been shown that, in spacetime dimensions n≥ 3, that the Kasner-scalar field solutions to the Einstein-scalar fields equations with potential V0 e-s ϕ, where…
Florian Beyer, David Garfinkle, James Isenberg et al.Mar 31, 2026
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Does a wormhole survive a cosmological bounce?
We investigate whether a dynamical wormhole could survive in a universe that undergoes a cosmological bounce. First, the conditions under which a wormhole could persist from a contracting to an…
Daniela Pérez, Gustavo E. Romero, Santiago E. Perez BergliaffaMar 31, 2026
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Wormhole Dynamics: Nonlinear Collapse and Gravitational-Wave Emission
We present 3D numerical-relativity evolutions of the unstable Ellis-Bronnikov wormhole using GRTeclyn, starting from exact isotropic initial data for the coupled Einstein-phantom-scalar system. With…
Nikita M. ShirokovMar 31, 2026
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What does the Universe sound like?
Unlike electromagnetic telescopes, gravitational-wave (GW) detectors cannot produce pretty pictures, but we can convert GW signals into sound. I compute what the Universe actually sounds like by…
Francesco IacovelliMar 31, 2026
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Bridging Quantum and Semiclassical Volume: A Numerical Study of Coherent State Matrix Elements in Loop Quantum Gravity
In Loop Quantum Gravity, the quantum action of the volume operator is crucial in understanding quantum dynamics. In this work, we implement a generalized numerical algorithm that can compute the…
Haida Li, Hongguang LiuMar 31, 2026
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Beyond Expectation Values: Generalized Semiclassical Expansions for Matrix Elements of Gauge Coherent States
We derive an asymptotic expansion for off-diagonal coherent-state matrix elements of non-polynomial operators in gauge theories admitting holomorphic coherent-state representations. The derivation…
Haida Li, Hongguang LiuMar 31, 2026
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QTAM: QTransform Amplitude Modulation
We present Q-Transform Amplitude Modulation (QTAM), a novel, fully invertible implementation of the Constant-Q Transform algorithm, designed to enable robust signal denoising and the disentanglement…
Lorenzo Asprea, Francesco Sarandrea, Alessio Romano et al.Mar 31, 2026
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Tidal deformations of general-relativistic multifluid compact stars
Over the past decade, gravitational-wave astronomy has opened a new window onto the extreme states of matter inside compact stars. At some point during the inspiral of a binary system, each star…
Ethan Carlier, Nicolas ChamelMar 31, 2026
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On the mapping between bound states and black hole quasinormal modes via analytic continuation: a spectral instability perspective
In this work, we investigate the relation between bound states and quasinormal modes within black hole perturbation theory in the context of spectral instability. Our analysis indicates that the…
Guan-Ru Li, Wei-Liang Qian, Xiao-Mei Kuang et al.Mar 31, 2026
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Towards Gravitational Wave Turbulence within the Hadad-Zakharov metric
The theory of gravitational wave turbulence describes the long-term statistical behaviour of a set of weakly nonlinear interacting waves. In this paper, we aim to study aspects of gravitational…
Benoît Gay, Eugeny Babichev, Sébastien Galtier et al.Mar 31, 2026
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Gravitational waves from gaps of neutron stars
The pulsar magnetosphere is a potential source of continuous gravitational waves due to the rapid charge-discharge process in short timescale, varying the electric-field energy density. We estimate…
Akira Dohi, Asuka Ito, Shota KisakaMar 31, 2026
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Mexican Burrowing Toads as gravitational wave detectors
It is generally assumed that gravitational waves are extremely difficult to detect. However, we show that the call of the Mexican Burrowing Toad has an amazing resemblance to cosmic gravitational…
Frederic V. Hessman, Christian JoossMar 31, 2026
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Extracting Energy from Magnetized Rotating Black Holes in Horndeski Gravity via the Magnetic Penrose Process
In Horndeski gravity, we investigate how to extract energy from a rotating black hole immersed in a uniform magnetic field B based on the Magnetic Penrose Process. We map the ergosphere and…
Ke Wang, Xiao-Xiong ZengMar 31, 2026
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Revisiting the Coprecessing Frame in the Presence of Orbital Eccentricity
Accurate inclusion of both spin precession and orbital eccentricity effects in gravitational waveform models represents a key hurdle in our ability to fully characterize the properties of compact…
Lucy M. Thomas, Katerina Chatziioannou, Sam Johar et al.Mar 31, 2026
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Quantum Einsteinian Cubic Cosmology
We study Cosmological Einsteinian Cubic Gravity (CECG) arXiv:1810.08166v3 in the context of minisuperspace quantum cosmology. CECG is a modification of Einstein's gravity by cubic curvature terms…
Nephtalí Eliceo Martínez Pérez, Cupatitzio Ramírez RomeroMar 31, 2026
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Probing soft signals of gravitational-wave memory with space-based interferometers
Gravitational-wave displacement memory is a remarkable and ubiquitous phenomenon predicted by general relativity, which has not yet been detected. Unlike the oscillatory components of gravitational…
Yan Cao, Yong-Liang Ma, Yong TangMar 30, 2026
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Connection Between the Shadow Radius and Quasinormal Frequencies for Black Holes in STVG with Perfect Fluid Dark Matter
We investigate the connection between black hole shadow and quasinormal mode (QNM) spectra in the context of scalar-tensor-vector gravity (STVG) coupled to perfect fluid dark matter (PFDM),…
Ziqiang Cai, Zhi Li, Zhenglong Ban et al.Mar 30, 2026
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No hair but plenty of feathers: are birds black holes?
The imitative verb "chirp" is thought to originate from 16th-century Middle English. Meanwhile, this same word has been used to describe the gravitational waves (GWs) emitted from the merger…
Andrew Laeuger, Taylor KnappMar 30, 2026
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Spin the black circle II: tidal heating and torquing of a rotating black hole by a test mass on generic orbits
Horizon fluxes of energy and angular momentum are a key strong-field effect in the dynamics of black holes, encoding direct information about their nature. In this work, we present a numerical study…
Rossella Gamba, Danilo Chiaramello, Estuti Shukla et al.Mar 30, 2026
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Charged scalar fields on Reissner--Nordström spacetimes I: integrated energy estimates
This is the first part of a series of papers deriving the precise, late-time behaviour and (in)stability properties of charged scalar fields on near-extremal Reissner--Nordström spacetimes via energy…
Dejan GajicMar 30, 2026
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The Depletion of Collisionless Dark Matter Spikes
Dense concentrations of dark matter (DM) surrounding black holes provide a compelling opportunity to probe the nature of DM. In the classic Gondolo-Silk model, the adiabatic growth of a massive black…
Charlie Sharpe, Yonadav Barry Ginat, Thomas F. M. Spieksma et al.Mar 30, 2026
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Charged scalar fields on Reissner--Nordström spacetimes II: late-time tails and instabilities
This is the second part of a series of papers deriving the precise, late-time behaviour and (in)stability properties of charged scalar fields on near-extremal Reissner--Nordström spacetimes via…
Dejan GajicMar 30, 2026
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A Covariant Phase Space Approach to Einstein-AEther Gravity
Black hole thermodynamics in Lorentz-violating gravity is subtle because different excitations propagate at different speeds and hence identify different causal horizons. We revisit Einstein--AEther…
Walter Arata, Stefano Liberati, Giulio NeriMar 30, 2026
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A connection between Gravitational Scalar-Tensor theories and Generalized Hybrid theories
We establish a correspondence between higher-derivative gravitational scalar-tensor theories of the form Ψ(R,(∇ R)2, R) and generalized hybrid metric-Palatini models f(R,R).…
Jonathan Ramírez, Santiago Esteban Perez BergliaffaMar 30, 2026
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