Astrophysical Black Hole horizons in a cosmological context: Nature and possible consequences on Hawking Radiation

Abstract

This paper considers the nature of apparent horizons for astrophysical black hole situated in a realistic cosmological context. Using semi-tetrad covariant methods we study the local evolutions of the boundaries of the trapped region in the spacetime. For a collapsing massive star immersed in a cosmology with Cosmic Background Radiation (CBR), we show that the initial 2 dimensional marginally trapped surface bifurcates into inner and outer horizons. The inner horizon is timelike while the continuous CBR influx into the black hole makes the outer horizon spacelike. We discuss the possible consequences of these features for Hawking radiation in realistic astrophysical contexts.

arXiv comment14 pages, 4 figures, Minor corrections in the text, Matches the accepted version in Physical Review D

References in corpus (34)

• Hawking Radiation as Tunneling
• Formation and evaporation of non-singular black holes
• The Stretched Horizon and Black Hole Complementarity
• The Nature of Space and Time
• Introduction to Isolated Horizons in Numerical Relativity
• Dynamical Horizons: Energy, Angular Momentum, Fluxes and Balance Laws
• Gravito-electromagnetism
• Essential and inessential features of Hawking radiation
• 3+1 Formalism and Bases of Numerical Relativity
• Information loss problem and a `black hole' model with a closed apparent horizon
• Production and decay of evolving horizons
• A covariant approach for perturbations of rotationally symmetric spacetimes
• Covariant Perturbations of Schwarzschild Black Holes
• The Covariant Approach to LRS Perfect Fluid Spacetime Geometries
• Marginally trapped tubes and dynamical horizons
• A Gravitational Entropy Proposal
• Comments on information loss and remnants
• Information Consumption by Reissner-Nordstrom Black Holes
• Scalar field and electromagnetic perturbations on Locally Rotationally Symmetric spacetimes
• Black holes and black hole thermodynamics without event horizons
• Mass and Angular Momentum in General Relativity
• Backreaction of Hawking Radiation on a Gravitationally Collapsing Star I: Black Holes?
• Radiation from collapsing shells, semiclassical backreaction and black hole formation
• Black hole evaporation without an event horizon
• Almost Birkhoff Theorem in General Relativity
• The spherical symmetry Black hole collapse in expanding universe
• The Evolution of Our Local Cosmic Domain: Effective Causal Limits
• Radiation from the LTB black hole
• Properties of Black Hole Radiation From Tunnelling
• Cosmic Censorship Conjecture revisited: Covariantly
• Local Approach to Hawking Radiation
• Astrophysical black holes may radiate, but they do not evaporate
• Cosmic background radiation in the vicinity of a Schwarzschild black hole: no classic firewall
• Gravitational Lensing in Spherically Symmetric Spacetimes

Cited by in corpus (14)

• Particle creation from the quantum stress tensor
• Global structure of static spherically symmetric solutions surrounded by quintessence
• Some Result on Cosmological and Astrophysical Horizons and Trapped Surfaces
• Horizon area bound and MOTS stability in locally rotationally symmetric solutions
• On Properties of Expansion-free Dynamical Stars
• On the existence of marginally trapped tubes in spacetimes with local rotational symmetry
• Suppression of Bekenstein-Hawking radiation in $f(T)$-gravity
• Accreting Black Holes radiate classical Vaidya radiation to pave way for Hawking radiation
• On the existence of conformal Killing horizons in LRS spacetimes
• Non-existence of expansion-free dynamical stars with rotation and spatial twist
• Geometric properties of a certain class of compact dynamical horizons in locally rotationally symmetric class II spacetimes
• Gradient conformal stationarity and the CMC condition in LRS spacetimes
• From a collapsing radiating star to an evaporating black hole: A smooth transition from classical to quantum entropy
• On some locally symmetric embedded spaces with non-negative scalar curvature and their characterization