In massive scalar-tensor gravity, rotating neutron stars that collapse emit nearly the same tensor gravitational waves as in general relativity, but lose about 10^-3 solar masses of energy in scalar radiation - far more than the quadrupole channel.
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Penrose, Phys
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Non-equilibrium relativistic SIDM halo collapse produces seed black holes of mass ~3e-8 of the halo mass at apparent horizon formation.
For cylindrical black strings, NED Lagrangians with a Maxwell weak-field limit cannot produce regular purely electric or dyonic cores; regular magnetic Bardeen/Hayward analogues exist but violate causality near the axis.
An exact spherically symmetric analytic collapse model grows an apparent horizon H(t) from zero to 2M while hiding an integrable central singularity and preserving weak cosmic censorship without exotic matter.
Closed-form expressions for particle orbits and photon spheres are derived for a KR-NED black hole, with shadow radius consistent with EHT data and Hawking sparsity increased to ~1700 from 496.
A Chiellini-integrable scalar field with Higgs-type potential collapses asymptotically with a perfect fluid, never forming a singularity in finite time and permitting multiple apparent horizons or none.
Bound states of a massive scalar field around topological stars form strictly normal modes, producing a hydrogen-like spectrum when the Compton wavelength exceeds the star size and localized states otherwise.
Incorporating non-local gravitational self-energy from a T-duality-inspired model yields a regular neutral black-hole metric with extremal Planck-mass particle-black-hole solutions that are thermodynamically stable and suggested as dark matter.
The work calculates scalar quasinormal mode spectra for a rotating quantum-corrected black hole and constructs a methodological pipeline to infer the quantum correction parameter from gravitational-wave ringdown data using informative priors.
Dynamical evolution of Schwarzschild black holes produces new interior singularities absent in the static case, with resolution imposing highly restrictive conditions on gravitational collapse.
The authors analyze formation and evolution of trapped surfaces during matter collapse in de Sitter spacetime and conclude that black hole and cosmological horizons develop as time evolution of marginally trapped surfaces.
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Non-Equilibrium Relativistic Core Collapse of Self-Interacting Dark Matter Halos -- Limits On Seed Black Hole Mass
Non-equilibrium relativistic SIDM halo collapse produces seed black holes of mass ~3e-8 of the halo mass at apparent horizon formation.