TY - JOUR
T1 - Perfect fluid with shear viscosity and spacetime evolution
AU - Cho, Inyong
AU - Shaikh, Rajibul
N1 - Publisher Copyright:
© 2023 The Physical Society of the Republic of China (Taiwan)
PY - 2024/2
Y1 - 2024/2
N2 - We investigate the anisotropic evolution of spacetime driven by perfect fluid with off-diagonal shear-viscosity components. We consider the simplest form of the equation of state for fluid, for which the pressure and the shear stress are proportional to the energy density individually. At late times, compared with the usual Friedmann universe, we find that the spacetime expands less rapidly as the energy density drops faster due to the transfer to the shear stress. Very interestingly, for some ranges of the equation-of-state parameters, we find that the initial big-bang singularity can be removed.
AB - We investigate the anisotropic evolution of spacetime driven by perfect fluid with off-diagonal shear-viscosity components. We consider the simplest form of the equation of state for fluid, for which the pressure and the shear stress are proportional to the energy density individually. At late times, compared with the usual Friedmann universe, we find that the spacetime expands less rapidly as the energy density drops faster due to the transfer to the shear stress. Very interestingly, for some ranges of the equation-of-state parameters, we find that the initial big-bang singularity can be removed.
KW - Anisotropic cosmology
KW - Einstein equations
KW - Exact solutions
KW - General relativity
UR - http://www.scopus.com/inward/record.url?scp=85180603777&partnerID=8YFLogxK
U2 - 10.1016/j.cjph.2023.12.017
DO - 10.1016/j.cjph.2023.12.017
M3 - Article
AN - SCOPUS:85180603777
SN - 0577-9073
VL - 87
SP - 452
EP - 464
JO - Chinese Journal of Physics
JF - Chinese Journal of Physics
ER -