LIGO rules out boson clouds around Cygnus X-1's black hole
First directed search finds no gravitational waves from ultralight vector boson clouds, excluding masses 0.85–1.59 × 10^-13 eV.
gr-qc
General Relativity and Quantum Cosmology
General Relativity and Quantum Cosmology Areas of gravitational physics, including experiments and observations related to the detection and interpretation of gravitational waves, experimental tests of gravitational theories, computational general relativity, relativistic astrophysics, solutions to Einstein's equations and their properties, alternative theories of gravity, classical and quantum cosmology, and quantum gravity.
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Squared-matter term in gravity flattens galaxy rotation curves
A dust-filled halo then moves at constant speed set by s/2, with testable lensing and radar-delay effects.
Torsion corrections compactify neutron stars and cut their max mass
Positive spin-spin couplings from quadratic torsion lower the maximum mass and binding energy relative to general relativity for the DD2 equ
· “Neutron stars in Poincar\'e gauge gravity with quadratic torsion”
Covariant method tracks photon spheres in dynamic black holes
Extends light-ring analysis from stationary cases to collapsing, accreting and evaporating spacetimes while recovering static limits.
Wormhole solution derived analytically with positive cosmological constant
Gravitational decoupling on the Ellis-Bronnikov geometry produces two throats obeying flare-out and energy condition requirements.
· “Analytical solution of traversable wormholes in the presence of positive cosmological constant”
Averaged causal set propagator equals exp of link matrix
In 1+1 dimensions the massless retarded propagator on sprinkled points recovers the continuum result after normalization and averaging.
Baryogenesis operator alters effective Planck mass
Treating the interaction as part of the action produces time-dependent gravitational coupling in FLRW models
· “Gravitational baryogenesis beyond the spectator approximation”
Wineglass wormhole is the likeliest seed of an inflating cosmos
In Einstein-Scalar-Maxwell models, the dominant Euclidean saddle continues to an expanding universe with early inflation.
· “A Menagerie of Wormholes and Cosmologies in the Gravitational Path Integral”
Full-time integrals make correlators simpler than wavefunctions
Around every pole the first subleading Laurent term vanishes; total-energy expansions become a differential operator on amplitudes.
Future event horizon cutoff eases Hubble tension in HDE models
Models with this infrared scale reduce the early-versus-late expansion discrepancy while Hubble-scale versions leave it unchanged.
· “Revisiting the Hubble tension problem in the framework of holographic dark energy”
Two new exact spherical vacuum solutions found in Newer GR
A unified coincident-gauge connection produces both, with no counterpart in General Relativity.
· “Symmetric Teleparallel Connection and Spherical Solutions in Newer GR”
Decaying vacuum raises H0 to 71.6
Two vacuum-decay models fit combined data with a positive decay parameter and shift the 5-sigma conflict onto matter density.
A torus ergoregion can replace the horizon in the Penrose process
Negative-energy debris stays trapped while its partner escapes amplified; a rotating boson star demonstrates the full decay
Modified gravity changes low-frequency gravitational-wave lensing
A curvature-coupled propagation equation prevents the amplification factor from reaching unity at zero frequency.
· “Wave-optics gravitational wave lensing in modified gravity”
Naked singularities stable under small Hölder perturbations
Result for Christodoulou's family shows that weak cosmic censorship depends on the regularity class chosen for perturbations
Golden-ratio exponent fixes a gravity kernel
A discrete ledger argument pins α≈0.191 with no free knobs; SPARC rotation curves give median χ²/N≈3.06.
Regular hairy black holes emerge from Bardeen and hollow seeds
A fixed exponential profile in gravitational decoupling creates de Sitter and Minkowski cores with mapped horizons and verified energy condi
· “Regular hairy black holes by gravitational decoupling: Bardeen and Minkowski-core seeds”
Black hole spin lengthens neutrino oscillation periods
In outward paths through Kerr-Newman spacetime, larger angular momentum increases periods of survival probability and entanglement while cha
· “Quantum Correlations of Neutrinos in the Kerr-Newman Space-time”
Quantum corrections raise black hole ringdown frequencies
Larger correction scales in the Bardeen metric increase the potential barrier, yielding higher frequencies and slower damping.
String loops, not radiation, can park the volume modulus
NS5-brane loops absorb 97% of the energy at a tracker fixed point, gentling the modulus into its minimum.
· “Dynamics of Cosmic Superstrings and the Overshoot Problem”
One function predicts every expansion rate in a spherical profile
Local and enclosed density contrasts plus the growth rate fix the full velocity response without an evolution equation
Cubic curvature terms stabilize emergent vacua in f(R) gravity
Only power-law corrections with n>D/2 generate ghost-free vacua without a bare cosmological constant.
Electric and magnetic Penrose channels add up in a dyonic black hole
Magnetic charge opens a second extraction channel, and Lorentz violation raises both ideal efficiencies.
This paper compares two-atom correlations in three settings that feel equally hot…
When local temperatures are matched, two-atom cross spectra in de Sitter spacetime and uniformly accelerated Minkowski vacuum share a…
Torsion-balance data bound stochastic gravity noise to 2.4e-23
A calibrated residual torque spectrum turns any published angle floor into a reusable constraint on new gravitational noise.
Ghost of quadratic gravity obeys a dipole equation and is confined
If bound states form, gravity's ghost vanishes from physical amplitudes and unitarity returns.
· “Massive Ghost Confinement, Dipole Equation and Multipole States in Quadratic Gravity”
Dark matter's crisis is a crisis of principles
Four leading dark matter candidates are ranked by how little they disturb known physics; sterile neutrinos come out on top.
· “Dark Matters of Principle: Principles in the Dark Matter Paradigm”
One scalar field can stop anti-de Sitter space from collapsing
A non-minimal coupling neutralizes negative vacuum energy and yields a radiation-like expansion.
One conserved charge turns an eternal past into a hot big bang
The electroweak vacuum's conserved charge adds a radiation-like term to the Friedmann equation, with no radiation fluid.
· “Cosmological Evolution of the Higgs Vacuum Expectation Value in Emergent Gravity”
Extremal horizons can inflict a tidal kick on infalling observers
Nearly co-rotating waves diverge at the horizon, so the kick grows without bound as detuning shrinks.
· “Amplification of metric perturbations by extremal horizons”
Regular core quiets Hawking radiation and prolongs evaporation
A smooth phantom-DBI core lowers the temperature, cuts the luminosity, and strengthens absorption, scattering, and deflection.
TESS can feel dark subhalos down to 6.3e-9 m/s²
Dipolar star shifts predicted from TESS would probe dark subhalos from 1e-6 to 1e7 solar masses.
· “A New Probe of Dark Matter Subhalos: Stellar Aberration with TESS”
Cosmic Explorer could detect memory in tens of mergers per year
A year of two Cosmic Explorer detectors would give population evidence for spin and center-of-mass memory.
Quantum frame jumps commute with adding subsystems
Retaining each perspective's 'extra particle' dissolves the paradox of the third particle.
· “Compositionality in quantum reference frame perspectives”
Closure phase becomes a quantitative probe of image asymmetry
A log-visibility identity maps image structure to phase, and winding charge governs what happens at true visibility nulls.
· “A General Response Theory for Closure Phases through Visibility Nulls and Image Structure”
Double copy survives curvature
Where double-copy squaring gives AdS/dS gravity, and where curvature forces extra terms.
· “Color-Kinematics Duality and the Double Copy in Curved Spacetimes”
de Sitter stability depends on scalar mass
A Wilsonian flow with Hubble as the cutoff turns pure de Sitter into a saddle, while m > 0 restores an attractor.
Entropy correction shifts inflation's tilt and tensor ratio
Single-field slow-roll spectra keep their shape while amplitude, tilt, runnings, and r gain δ=ακH² terms.
· “Primordial spectra from modified Bekenstein-Hawking entropy law”
Prime numbers yield a quantum-corrected black-hole metric
The prime-gas entropy fixes the log correction and a cold remnant at about 0.56 Planck masses.
· “From arithmetic spectra to a quantum-corrected black hole geometry”
White holes mirror black holes' tidal response in bathtubs
In rotating bathtub flows, the white hole deforms like the black hole but dissipates with the opposite sign.
· “Dynamical Love numbers of analogue rotating black and white holes”
Gravitational-wave background stays hidden as limits tighten 1.4-fold
The predicted cosmic-binary hum sits three times below the new limit—and within reach of future runs.
Two-fluid gravity closure breaks the GR limit
In scale-independent EMSG, transfer coefficients ignore the coupling α, so α→0 never returns uncoupled GR.
Runaway Higgs patches always end cloaked as black holes
Simulations show the unstable core hides behind a horizon; one branch passes through a transient wormhole and child universe.
· “Black holes from a Higgs-like field in the radiation era”
Charged collapse to an extremal black hole needs |e|r+ > 1/3
A new bound pins down when charged scalar collapse can reach extremality; subextremal collapse carries no such limit.
No equilibrium for multiple rotating black holes
Every inter-horizon axis rod attracts, so stationary vacuum spacetimes have a single black hole.
Equal-mass neutron star mergers seed jets
A longer-lived equal-mass remnant builds a magnetic funnel within 15 ms; the lopsided binary ejects 50% more mass.
· “Binary Neutron Star Merger Simulations with Microphysical Equation of State using Spritz”
Wormhole throat lensing follows a 1/4 power law
Deflection grows as the 1/4 power of the impact-parameter gap; the paper computes universal coefficients.
Strong-mixing collider signal is half as suppressed
Exact Laplace-space solution shows oscillations grow with time-derivative interactions, sharpening observational targets.
· “Analytical Cosmological Collider at Strong Mixing in Laplace Space”
One gauge group fixes four fermion families
A single Weyl spinor of SO(2,16) breaks into exactly four chiral SO(10) families—no tuning of the family number.
· “Conformal and Noncommutative Gravity from Gauge Symmetry Breaking and SO(2,16) Unification”
Brans-Dicke inflation fits all four CMB datasets at 95% CL
N=60 curve lands inside Planck, DESI, and ACT 95% contours, constraining the BD parameter.
· “Brans Dicke scalar-tensor gravity and unimodular FRW cosmology with Coleman-Weinberg potential”
Direct waves home in on the remnant black hole's horizon
As remnant spin varies, the signal's frequency approaches twice the horizon rotation rate from above or below.
· “Complex frequency evolution of direct waves from binary black hole mergers”
Unruh vacuum quantization violates canonical commutators
In 4D Schwarzschild, the standard black-hole vacuum construction fails the [φ,π] test that works in 2D
Horizon radius alone cannot fix shadow or ringdown
Same horizon, different shadows and ringdowns: in hairy black holes, mass normalization decides the trend.
After heat death, quantum complexity follows Cmax e^{-1/t}
A derivation from quantized information replaces the conjecture, making linear growth only a brief early phase.
· “`It from Bit': is there a second law of quantum complexity?”
This paper derives the full equations for ripples in spacetime during a type of…
The paper derives the perturbation action for multi-field Gauss-Bonnet inflation, discovers an antisymmetric velocity coupling, and…
· “Curvature and Isocurvature Perturbations in multi-field Gauss-Bonnet inflation”
This paper presents a geometric construction for photon kinetic theory in curved spacetime
Photons get a covariant Boltzmann equation in curved spacetime via a non-vanishing volume element on the light cone bundle.
· “Geometric formulation for the relativistic kinetic theory of photons”
This paper calculates how a quantum-spacetime correction alters the throttling behavior…
The κ-deformed Schwarzschild-AdS black hole exhibits a Joule-Thomson inversion with T_i^(min)/T_c = 0.49316, independent of the deformation…
· “Joule Thomson expansion of kappa-deformed Schwarzschild-AdS black hole”
The paper checks whether making gravity "unimodular"
For axial and vector torsion sectors on maximally symmetric and flat homogeneous torsion backgrounds, unimodular and…
· “Towards Perturbative Unimodular Poincar\'e Gauge Theories with Propagating Torsion”
Corrected stability math widens charged quark star range
A missing charge term and a wrong sign in the old equation had made many stable stars look unstable.
Nonlocal regulator makes four-loop Higgs-gluon graphs finite
Four-dimensional finite integrals replace ultraviolet subtractions for the N3LO gluon-fusion form factor.
· “On the Four-Loop Higgs--Gluon Form Factor in Nonlocal Quantum Field Theory”
No two-Killing-vector Weyl spacetime hides an integral
Even Schwarzschild's Carter constant is just angular momentum, so integrability comes from symmetry, not hidden tensors.
Dark matter may be a mirage of extra dimensions
A space-dependent compactification radius produces the potential usually blamed on dark matter.
· “Cosmological extra dimensions can mimic dark matter I. Dark matter in galaxies”
A million glitches a year would hit Einstein Telescope
Simulated seismic and magnetic transients also cap stochastic searches and undermine the null stream.
· “Correlated and coincident noise in Einstein Telescope's triangular configuration”
Dark Ages signal closes the cosmic-string escape hatch
The vector radiation that weakens the gravitational-wave signal would also erase the Dark Ages 21-cm absorption dip.
Kerr–BR black holes get Kerr's own thermodynamics
A Killing-vector rescaling makes the magnetized rotating black hole obey Kerr's exact thermodynamic laws.
· “Thermodynamics of Genuine Kerr-Bertotti-Robinson Black Holes”
Weak acceleration gives EMRI waveforms a radian phase shift
For a million-solar-mass black hole, AM=3e-7 dephases the dominant mode past one radian in a year.
· “Extreme mass-ratio inspirals around rotating accelerating black holes”
Variational Bayes cuts LISA noise-spectrum runs from hours to minutes
On two simulated one-year LISA datasets, the fast approximation matches sampling-based accuracy at 27–37x lower cost.
· “Variational Bayesian Inference for the Spectral Structure of LISA Noise”
Individual spins change kilonova brightness by 0.9 magnitude
Binaries matched in mass and effective spin still eject up to 45x more material and synthesize 100x more heavy elements
Radiation transport now follows photons through warped
A changed conserved variable lets angle-resolved transport track light through binary black holes and expanding universes.
· “Finite-Solid-Angle Boltzmann Radiation Transport on Dynamical Spacetimes in AthenaK”
No finite protocol can certify quantum uniqueness
Any finite set of Weyl measurements is matched by a non-regular polymer state, so uniqueness needs an extra assumption.
Exact dyonic black hole found at one special coupling ratio
At b=a/2 the field equations close, giving closed-form horizons, a Smarr integral, and polarization-split shadows.
· “An exact dyonic black hole at the integrable locus of quadratic nonlinear electrodynamics”
One on-shell residue fixes one cone number
Unseen four-photon and curvature-photon directions mean the single residue leaves the cone flow underdetermined.
· “Characteristic-cone running from on-shell residues: Identifiability on the physical EFT quotient”
One forward pass yields every configuration of a boson-star family
The trained network replaces repeated nonlinear solves, including inner branch turning points.
· “Learning Boson Star Solution Families with Physics-Informed Neural Networks”
Black holes may show a 5.6x fingerprint of collapse's echo
Narrow primordial spectra would then carry black-hole mass features spaced by a factor of about 5.6.
· “Discrete self-similarity imprints on primordial-black-hole mass functions”
Black hole rings higher and longer under a companion's tide
For a physical companion, the dominant ringdown mode oscillates faster and decays more slowly, giving a testable tidal fingerprint.
· “The Schwarzschild Black Hole in an External Gravitational Tidal Field: the Quasinormal Spectrum”
White dwarf spectra tighten limit on changing G
In a field 10,000 times Earth's, Ni V line centroids set G's drift below 10^-15 per year.
· “Probing Variations of Newton's Constant in Strong Gravitational Fields”
A genuinely neutral Kerr black hole can sit in a uniform magnetic field
New exact solution shows its e=0 subfamily is uncharged and pins down the earlier solution's special charge
· “Kerr-Newman and genuine Kerr black holes in the Bertotti-Robinson magnetic field”
Inertia cannot see spacetime torsion
Free trajectories cannot see scale or torsion; the antisymmetric residue is proposed as the particle's spin.
A curvature coupling tames vector-field instabilities during inflation
Raising ξ suppresses both polarizations, advances mass crossing, and ends the longitudinal tachyon above ξ ≈ 0.02.
At zero temperature the black hole and exterior both gain entropy
The Generalized Second Law holds with both sides increasing, not with exterior gain compensating hole loss.
· “Dual entropy gain by radiation at the zero temperature limit”