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How inflationary gravitons affect gravitational radiation.

L Tan1, N C Tsamis2, R P Woodard1

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Graviton loop contributions to Einstein

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Area of Science:

  • Theoretical physics
  • Cosmology

Background:

  • The standard model of cosmology relies on perturbation theory.
  • Primordial inflation is a key period in the early universe.

Purpose of the Study:

  • To investigate one-loop corrections to gravitational radiation.
  • To analyze the impact of graviton loop contributions on cosmological models.

Main Methods:

  • Inclusion of single graviton loop contribution to linearized Einstein equations.
  • Calculation of one-loop corrections for gravitational radiation propagation.

Main Results:

  • Corrections are enhanced by the square of inflationary e-foldings.
  • Perturbation theory may break down during extended primordial inflation.
  • One-loop corrections to the tensor power spectrum could be observable.

Conclusions:

  • The study highlights potential limitations of perturbation theory in cosmology.
  • Observable signatures in 21cm cosmology may arise from these corrections.