$e^+e^-$ annihilation on the stochastic background of squeezed primordial gravitational waves
Year: 2021
Type: preprint
Abstract: The evolution of primordial gravitational waves is studied. The $e^+e^-$ annihilation leads to modification in the spectrum of primordial gravitational waves. This effect is studied for primordial gravitational waves in the squeezed vacuum state. It is found that while $e^+e^-$ leads to a reduction of $\sim 10 \%$ in the amplitude and of $\sim 25 \%$ in the energy of gravitational waves without squeezing effect for frequency $\geqslant 10^{-12}$ Hz, it leads to enhancement by the same amount in the amplitude and energy respectively for frequency $\leqslant 10^{-10}$ Hz for the gravitational waves in the squeezed state. The combined effect of $e^+e^-$ annihilation and squeezing effect produces $\sim 70 \%$ enhancement in the amplitude and $\sim 140\%$ enhancement in the energy of the primordial gravitational waves compared to the unmodified cases.
Source: arXiv (Cornell University)
Author: N. Malsawmtluangi
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3203242885