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A non-static quantum inspired spacetime in f(R) gravity: Gravity's rainbow.

Prabir Rudra1

  • 1Department of Mathematics, Asutosh College, Kolkata-700 026, India.

Nuclear Physics. B
|May 7, 2020
PubMed
Summary

Investigating gravitational collapse in quantum gravity

Area of Science:

  • Theoretical physics
  • Quantum gravity
  • Cosmology

Background:

  • Explores non-static spacetime in a quantum regime using gravity's rainbow, a UV completion of General Relativity.
  • Studies the time-dependent Vaidya metric, representing a radiating star's spacetime, within this framework.

Purpose of the Study:

  • To probe the nature of singularities (black hole vs. naked singularity) formed during gravitational collapse.
  • To investigate the influence of gravity's rainbow on singularity formation and cosmic censorship.

Main Methods:

  • Utilizes gravitational collapse as the primary tool.
  • Employs geodesic studies to analyze singularity types.
  • Considers two models of gravity: Starobinsky's inflationary model and the power law model.

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Main Results:

  • Reveals that naked singularities are as probable as black holes, depending on initial data fine-tuning.
  • Gravity's rainbow enhances the likelihood of naked singularity formation.
  • Deduces conditions for strong or weak curvature singularities.

Conclusions:

  • The study highlights deviations from classical physics, attributed to quantum fluctuations in quantum gravity.
  • Findings are crucial for understanding the Cosmic Censorship hypothesis and quantum gravity theories.