Superposition of FLRW universes


GÜRSES M., Heydarzade Y., TEKİN B.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2020 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: Konu: 6
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1088/1475-7516/2020/06/060
  • Dergi Adı: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

Özet

We show that (1) the Einstein field equations with a perfect fluid source admit a nonlinear superposition of two distinct homogenous Friedman-Lemaitre-Robertson-Walker (FLRW) metrics as a solution, (2) the superposed solution is an inhomogeneous geometry in general, (3) it reduces to a homogeneous one in the two asymptotes which are the early and the late stages of the universe as described by two different FLRW metrics, (4) the solution possesses a scale factor inversion symmetry and (5) the solution implies two kinds of topology changes: one during the time evolution of the superposed universe and the other occurring in the asymptotic region of space.