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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Pole-skipping points match shock-wave scattering, mapping the dual theory into nonlocal and non-Hermitian sectors.
· “Cosmological pole-skipping, shock waves and quantum chaotic dynamics of de Sitter horizons”
The narrow mass window still evaporating today is the key target for testing whether black hole information is recovered.
· “Page Time of Primordial Black Holes in the Standard Model and Beyond”
Promoting the Dirac field's symmetric derivative to a variable closes the energy estimates.
· “On the local existence for the characteristic initial value problem for the Einstein-Dirac system”
Ringdowns shift as 1-C+C²/6; EHT shadows put the halo compactness below 0.092.
· “Shadow and Quasi-Normal Modes of Schwarzschild-Hernquist Black Hole”
Small-scale inflation noise cannot shift long-wavelength gravitational waves: symmetry cancels the one-loop terms.
· “One-loop corrections to infrared GWs is forbidden by symmetries”
Curvature becomes an invariant of the pair (metric, divergence), with explicit formulas in classical data.
· “The canonical generalised Levi-Civita connection and its curvature”
A dust-shell collapse fixes energy as ADM mass, forcing entropy to A/4G — generalized entropies fail.
· “Black Holes Thermodynamics and Generalised Non-Extensive Entropy”
Long-range Coulomb acceleration forces universal retarded-time tails into the electromagnetic waveform in every dimension.
· “Logarithmic Soft Photon Theorem and Waveform Tails in Higher Dimensions”
Quantum fluxes amplify near the inner horizon and turn a trapped black-hole region into a white-hole one.
· “Semiclassical Black Hole-White Hole transitions: an analytical treatment”
If the hair parameter holds, black hole images can separate Horndeski gravity from Kerr spacetime at current precision.
Bilby's acceptance-walk kernel ported to GPU returns identical results at a fraction of runtime and cost.
· “Gravitational-wave inference at GPU speed: A bilby-like nested sampling kernel within blackjax-ns”
Body gives Kretschmann ~ r^-9 vs Schwarzschild r^-6 and calls the singularities generally stronger.
Even so, net memory and final decay match vacuum; tails are the environmental probe.
· “Gravitational-wave tails and memory effect for mergers in astrophysical environments”
3D simulations: non-rotating stars shed 99% of field energy; spinning ones keep up to 59%.
· “Impact of rotation on magnetic field stability and orientation in isolated neutron stars”
Universal bound on stable light rings around static black holes, tightening where accretion and GW signals arise.
Negative φ⁶ potential creates the hair, but quasinormal modes show it never settles down.
· “Negative potential-induced scalarization in the Einstein-Euler-Heisenberg black hole”
Simulations match GW231123's large masses and spins, pointing to repeat mergers in an AGN disk.
· “Prospects for the formation of GW231123 from the AGN channel”
Numerical model of a thin-film helium simulator shows mutual information scales with boundary size, enabling lab tests.
· “Information in quantum field theory simulators: Thin-film superfluid helium”
In a GW200115-like binary, mass transfer may start before plunge — a third fate beyond tidal disruption.
A two-fluid model says dark matter fraction and quark anisotropy set the curves that X-ray and pulsar timing can test.
· “Exploring the Structural Properties of Anisotropic Dark Matter-Admixed Quark Stars”
A closed form now resums every half-odd post-Newtonian correction at arbitrary velocity.
· “Radiation-Reaction and Angular Momentum Loss at mathcal{O}(G⁴)”
One derivation gives T=1/8πGM and S=A/4G, tying gravity to thermodynamics.
Despite apparent singularities, this Calabi-Yau integral admits ε-factorized form.
· “Calabi-Yau Feynman integrals in gravity: varepsilon-factorized form for apparent singularities”
Photon-ring and highly damped overtones both descend from one seed mode via pp-wave symmetries.
· “pp-Waves and the Hidden Symmetries of Black Hole Quasinormal Modes”
In 2D condensates, flow can outrun sound at a horizon, with a computable Hawking temperature for uniform-density setups.
· “Acoustic black holes, white holes, and wormholes in Bose-Einstein condensates in two dimensions”
A Lorentz-violating metric parameter reshapes Sgr A*'s ring, turning its image into a Planck-scale test.
The inflaton's kinetic rule may encode critical exponents that CMB experiments can read.
· “From Quantum Correlations to Inflationary Tracking Scalar Field Evolution”
The holographic QCD phase boundary is a first-order line plus a subtle third-order line, both ending at one point.
A sourced Teukolsky equation on plane waves computes quadratic quasinormal-mode ratios for Kerr lightrings.
· “Perturbations of Plane Waves and Quadratic Quasinormal Modes on the Lightring”
A review extends the growing interior volume to charged, rotating, higher-dimensional and f(R) black holes.
If the censorship conjecture holds, no post-evaporation region exists for information to leak into.
A running Newton's constant replaces the Big Bang singularity with a bounce and may resolve the Hubble tension.
Lecture review: structure growth can't mimic dark energy, and average distances match the smooth-universe prediction.
· “Les Houches on Dark Universe 2025: Elements of cosmology beyond FLRW”
A pair of angle-dependent shifts at null infinity links non-rotating and rotating black hole geometries.
· “Asymptotic Generation of Kerr Geometry from Schwarzschild via BMS Supertranslations”
When area fails, an entropy-based expansion keeps light rays converging and obeys a second law.
· “Generalised focusing theorem and dynamical horizon entropy in diffeomorphism-invariant theories”
Hubble rate crosses zero, the co-moving radius diverges, and the null energy condition breaks exactly at the bounce.
· “Bouncing Cosmology in Interacting Scalar-Torsion Gravity”
The phase imprint is second-order tiny; detecting G'/G at 10^-n/yr demands a 2n-order leap in reach.
· “The effect of the gravitational constant variation on the phase of gravitational waves”
One predicts +3%, the other −3% in gravity's strength, with opposite signs in gravitational-wave damping.
· “Constraints on Logarithmic Model Extensions of Symmetric Teleparallel Gravity”
Even with a precessing disk, timing alone measures disk tilt and precession but stays blind to spin.
Five of six double-transition cases and two triple events are closed-form, locked to one separation scale rwide.
· “Coincident morphological transitions in precessing black-hole binaries”
One variable-coupling model survives CMB, DESI DR2 BAO, and three supernova samples; the rest do not.
· “Dark Energy Is Not That Into You: Variable Couplings after DESI DR2 BAO”
Curved field-space manifolds shift merger times, a possible GW fingerprint of string-motivated dark matter.
· “Scalar fields from nonlinear sigma models on black hole spacetimes”
A fifth-power scaling law ties formation to horizon-scale fluctuations and predicts small spins.
· “Primordial Black Hole Formation and Spin in Matter Domination Revisited”
Two particle-creation rates fit cosmic expansion as well as ΛCDM, with creation detected at many standard deviations.
· “Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI”
A review lays out three routes—bright, dark, and spectral sirens—for extracting the Hubble constant from gravitational-wave detections.
Bayesian inference now extracts mass, spin, and orbit parameters from unbound black-hole bursts.
· “Parameter estimation of gravitational waves from hyperbolic black hole encounters”
Small curvature-squared and aether corrections phase-shift the h+ and h× waveforms, giving future detectors a concrete target.
A thermalized hidden-sector coupling freezes the axion angle, then lets it ring coherently at late times.
A corrected gauge derivation shows CGR equals GR in vacuum; massive test particles would deviate from geodesics.
Quantum matter sources a classical Einstein tensor, with the metric re-glued continuously along future light cones of collapses.
The same Weyl-invariant theory ties the small Higgs mass and cosmological constant to tiny gauge couplings.
Calculated delays reach ~15 seconds for one mimic and ~0.12 for another, a pattern future pulsar timing could detect.
· “Time Delay of Pulsar Signals in Astrophysical Black Hole Spacetimes”
Interior operators can be dressed to the background and reconstructed from Hawking radiation
The phase-space method that models inspirals now spans the plunge, with the orbit alone generating the signal.
In a closed bouncing universe, the geometry stays smooth while the scalar field's derivative blows up.
· “A `singular' bounce in the theory of gravity with non-minimal derivative coupling”
Around a naked singularity, identical L and E can still describe two different-size orbits.
· “Periodic orbits of neutral test particles in Reissner-Nordstr\"{o}m naked singularities”
Complete Ricci-flat manifolds that look flat at infinity yet are not Euclidean Kerr black holes.
Modified gravity and dynamical dark energy both fit Pantheon+ and DESI observations far better than ΛCDM.
· “Modified gravity/Dynamical Dark Energy vs ΛCDM: is the game over?”
New 5.5PN and 6.5PN effective-one-body Q-potential terms, with quadratic-in-mass-ratio self-force predictions.
· “High-Post-Newtonian-Order Dynamics Induced by Tail-of-Tail Interactions: The Non-Geodesic Terms”
Applying the same density-level pivot to CPL erases its parameter degeneracy; DESI's preference for fafbCDM looks like a coordinate effect.
· “Do we really need alternatives to the ω₀ω_aCDM parameterization after the DESI DR2?”
If right, all small-temperature spectral corrections can be computed inside the near-horizon throat alone.
· “Projecting Gravitational Fluctuations onto Near-Horizon Throats”
Exterior geometry matches a black hole, but the interior boundary condition shifts the force on scalar and electric charges.
The sensitive distance metric stays within ~4%, and one leftover signal can skew benchmark results.
· “Robustness of Sensitivity Evaluations for Gravitational Wave Detection Algorithms”
A purely geometric quantity turns multivalued exactly where the free energy swallows its tail.
· “Gaussian curvature and Lyapunov exponent as probes of black hole phase transitions”
One tuned tensor makes the phantom-field propagator independent of the background, killing the gradient instability.
· “Restoration of the Lorentz symmetry of particle propagator in the ghost condensate model”
Only constants survive in the symmetric transverse part; geodesics match autoparallels only in special cases.
Modified gravity with torsion gives a three-region gravastar whose shell length, energy, and entropy all grow outward.
· “Gravastars with Kuchowicz Metric Potential in f(R, Sigma, T) Gravity”
A second ringdown tone at 18 ms after peak agrees with whole-signal models and passes Einstein's no-hair test.
· “Detection of a Higher Harmonic Quasi-normal Mode in the Ringdown Signal of GW231123”
The magnetic field pulls space shut; the sphere's tip is a deficit or excess depending on beta times ell.
· “Properties of the magnetic universe with positive cosmological constant”
Rescaled spatial metric follows Brownian motion on shape space and grows exponentially anisotropic instead of settling.
Stellar models show near-identical rapid rotators can produce the most massive merger known.
New closed-form equations of state and deceleration for both corrected models, with five scalar-field counterparts.
Toroidal initial fields suppress amplification; ejecta field strengths vary by an order of magnitude.
· “Magnetic Field Configurations in Binary Neutron Star Mergers II: Inspiral, Merger and Ejecta”
Emulators interpolate sparse simulation grids, delivering natal spin and envelope efficiency from GWTC-3.0
· “Exploring the astrophysical origins of binary black holes using normalising flows”
Fitting H0 with a mildly closed, matter–geometry-coupled universe lands near 69 and halves the Planck–SH0ES gap.
Hot, weakly cooled circumbinary gas lets magnetic flux eruptions carry angular momentum outward, shrinking the orbit.
Fast single-electron charge control clears a key obstacle to matter-wave interferometry with massive objects.
Initially retrograde gas reverses before plunging; lensing and Faraday rotation keep the three signature points apart.
· “Semi-analytical Study on the Polarized Images of Black Hole due to Frame Dragging”
Extremal timelike volumes in one static patch imply a finite, chaotic quantum system, the authors argue.
How charge, mass, and quintessence reshape shadow, ringdown, and lensing in Rastall-gravity black holes.