Covariant Onsager and Onsager-Machlup principles are derived for active matter with inertia, yielding geometrically consistent dynamics and path probabilities that satisfy the detailed fluctuation theorem.
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Derives a factorized leading term for the strong deflection angle near degenerate photon spheres using local expansion of the effective potential and Weyl tensor measures.
Gauge-covariant momentum yields branch-dependent electromagnetic sources in the Raychaudhuri equation for Lorentz-violating congruences, producing focusing or defocusing that depends on the dispersion branch and field gradients.
In static spherically symmetric throat spacetimes, EM and GW perturbations (ℓ≥1) experience strong sub-barrier suppression below their barrier-top frequencies, while the static gravitational monopole (ℓ=0) transmits with polynomial attenuation, establishing a universal constraint-wave asymmetry.
Regular black holes in Einasto dark matter halos show the strongest deviations from Schwarzschild in photon sphere and shadow properties near a critical halo parameter, remaining consistent with Sgr A* but mildly disfavoring M87* at high values.
An RG-improved Schwarzschild-like black hole yields a multipole-independent SCC ratio at the 6% level, a bell-shaped Hawking temperature, and remains the most Schwarzschild-like among regular black hole models while shadow-degenerate with Hayward and Bonanno-Reuter at the 1% level.
Einstein-Skyrme AdS black holes produce an AdS-specific epicyclic frequency behavior that fits twin-peak QPO data from XTE J1550-564, GRO J1655-40, Sgr A*, and M82 X-1 at Q ≈ 0.6 and r ≈ 4.2M.
In quadratic-EMSG the self-acceleration of self-gravitating bodies vanishes at 1PN order and total linear momentum is conserved, consistent with binary-pulsar bounds.
This pedagogical survey clarifies how conformal time governs geodesics and curvature in different eras of a flat FRW universe and provides a general affine-parameter formalism.
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Covariant Onsager and Onsager-Machlup principles for active and inertial dynamics
Covariant Onsager and Onsager-Machlup principles are derived for active matter with inertia, yielding geometrically consistent dynamics and path probabilities that satisfy the detailed fluctuation theorem.
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Strong-deflection expansion of the deflection angle near a degenerate photon sphere
Derives a factorized leading term for the strong deflection angle near degenerate photon spheres using local expansion of the effective potential and Weyl tensor measures.
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Gauge-covariant Raychaudhuri dynamics for spin-nondegenerate Lorentz-violating congruences
Gauge-covariant momentum yields branch-dependent electromagnetic sources in the Raychaudhuri equation for Lorentz-violating congruences, producing focusing or defocusing that depends on the dispersion branch and field gradients.
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Electromagnetic, gravitational wave, and static gravitational transmission through throat spacetimes: a constraint-wave asymmetry
In static spherically symmetric throat spacetimes, EM and GW perturbations (ℓ≥1) experience strong sub-barrier suppression below their barrier-top frequencies, while the static gravitational monopole (ℓ=0) transmits with polynomial attenuation, establishing a universal constraint-wave asymmetry.
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Strong-field signatures of a regular black hole in an Einasto dark matter halo
Regular black holes in Einasto dark matter halos show the strongest deviations from Schwarzschild in photon sphere and shadow properties near a critical halo parameter, remaining consistent with Sgr A* but mildly disfavoring M87* at high values.
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Renormalization-group improved Schwarzschild black hole: shadow, ringdown, and strong cosmic censorship
An RG-improved Schwarzschild-like black hole yields a multipole-independent SCC ratio at the 6% level, a bell-shaped Hawking temperature, and remains the most Schwarzschild-like among regular black hole models while shadow-degenerate with Hayward and Bonanno-Reuter at the 1% level.
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Astrophysical Signatures of Einstein-Skyrme Anti-de Sitter Black Holes: Epicyclic Frequencies and QPO Constraints
Einstein-Skyrme AdS black holes produce an AdS-specific epicyclic frequency behavior that fits twin-peak QPO data from XTE J1550-564, GRO J1655-40, Sgr A*, and M82 X-1 at Q ≈ 0.6 and r ≈ 4.2M.
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Dynamics of the $N$-body system in energy-momentum squared gravity: II. Existence of a Self-Acceleration
In quadratic-EMSG the self-acceleration of self-gravitating bodies vanishes at 1PN order and total linear momentum is conserved, consistent with binary-pulsar bounds.
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A Survey through Conformal Time
This pedagogical survey clarifies how conformal time governs geodesics and curvature in different eras of a flat FRW universe and provides a general affine-parameter formalism.
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