Corpus ID: 119119155

Massive Compact Objects in a Quantum Theory of Gravity

  title={Massive Compact Objects in a Quantum Theory of Gravity},
  author={S. Rama},
  journal={arXiv: General Relativity and Quantum Cosmology},
  • S. Rama
  • Published 2014
  • Physics
  • arXiv: General Relativity and Quantum Cosmology
A massive compact object is that which forms when a sufficiently massive star collapses. This is commonly taken to be a black hole with a singularity surrounded by a horizon and which evolves by emitting Hawking radiation. In a quantum theory of gravity, singularities are expected to be resolved and the evolutions are expected to be unitary. Assuming that such a theory with these properties exists, and with a few more physically motivated assumptions, we argue that a massive compact object has… Expand

Tables from this paper

Singularity Resolution + Unitary Evolution + Horizon = Firewall ?
We assume that a quantum gravity theory exists where evolutions are unitary, no information is lost, singularities are resolved, and horizons form. Thus a massive star will collapse to a black holeExpand
Horizonless, singularity-free, compact shells satisfying NEC
Gravitational collapse singularities are undesirable, yet inevitable to a large extent in General Relativity. When matter satisfying null energy condition (NEC) collapses to the extent a closedExpand
Black hole or Fuzz ball or a Loop quantum star ? Assessing the fate of a massive collapsing star
Using the effective equations in our Loop Quantum Cosmology (LQC) -- inspired models, we resolve the $(n + 2)$ dimensional black hole singularity. This resolution in the four dimensional case is sameExpand
On the stability of (M theory) stars against collapse: Role of anisotropic pressures
Unitarity of evolution in gravitational collapses implies existence of macroscopic stable horizonless objects. With such objects in mind, we study the effects of anisotropy of pressures on theExpand
Connecting horizon pixels and interior voxels of a black hole
Abstract In this paper we discuss to what extent one can infer details of the interior structure of a black hole based on its horizon. Recalling that black hole thermal properties are connected toExpand
Fast Radio Bursts and White Hole Signals
We estimate the size of a primordial black hole exploding today via a white hole transition, and the power in the resulting explosion, using a simple model. We point out that Fast Radio Bursts,Expand


Dimensional Reduction in Quantum Gravity
The requirement that physical phenomena associated with gravitational collapse should be duly reconciled with the postulates of quantum mechanics implies that at a Planckian scale our world is notExpand
From General Relativity to Quantum Gravity
In general relativity (GR), spacetime geometry is no longer just a background arena but a physical and dynamical entity with its own degrees of freedom. We present an overview of approaches toExpand
Quantum-gravity effects outside the horizon spark black to white hole tunneling
We show that there is a classical metric satisfying the Einstein equations outside a finite spacetime region where matter collapses into a black hole and then emerges from a white hole. We computeExpand
Black holes, predicted by Einstein gravity, appear to exist in the universe. Singularities were also predicted to form inside them by singularity theorems [Penrose 1965, Hawking 1967, Penrose &Expand
We review the construction of monsters in classical general relativity. Monsters have finite ADM mass and surface area, but potentially unbounded entropy. From the curved space perspective, they areExpand
Quantum information paradox: Real or fictitious?
One of the outstanding puzzles of theoretical physics is whether quantum information indeed gets lost in the case of black hole (BH) evaporation or accretion. Let us recall that quantum mechanicsExpand
Black Hole Macro-Quantumness
It is a common wisdom that properties of macroscopic bodies are well described by (semi)classical physics. As we have suggested this wisdom is not applicable to black holes. Despite beingExpand
Black hole evaporation: a paradigm
A paradigm describing black hole evaporation in non-perturbative quantum gravity is developed by combining two sets of detailed results: (i) resolution of the Schwarzschild singularity using quantumExpand
Black holes and massive remnants.
  • Giddings
  • Physics, Medicine
  • Physical review. D, Particles and fields
  • 1992
This paper examines the conundrum faced when one attempts to understand the dynamics of black hole formation and evaporation without abandoning unitary evolution: remnants that carry large amounts of information and whose size and mass depend on their information content. Expand
Remarks on Black Hole Evolution a la Firewalls and Fuzzballs
Assume that there exists a fundamental theory of gravity which has a fundamental length scale and which is capable of explaining black hole evolution process fully in terms of fundamental microscopicExpand