Effect of peculiar velocities on the gravitational potential in cosmological models with perfect fluids

Burgazli A., Shulga V., Yükselci A. E., Zhuk A.

PHYSICS LETTERS B, vol.809, 2020 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 809
  • Publication Date: 2020
  • Doi Number: 10.1016/j.physletb.2020.135761
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, INSPEC, zbMATH, Directory of Open Access Journals
  • Istanbul Technical University Affiliated: Yes

Abstract

We consider a universe filled with perfect fluid with the constant equation of state parameter omega. In the theory of scalar perturbations, we study the effect of peculiar velocities on the gravitational potential. For radiation with omega = 1/3, we obtain the expression for the gravitational potential in the integral form. Numerical calculation clearly demonstrates the modulation of the gravitational potential by acoustic oscillations due to the presence of peculiar velocities. We also show that peculiar velocities affect the gravitational potential in the case of the frustrated network of cosmic strings with omega = -1/3. (C) 2020 The Author(s). Published by Elsevier B.V.