Cosmological consequences of first-order general-relativistic viscous fluid dynamics
Cosmological consequences of first-order general-relativistic viscous fluid dynamics
复制标题
一阶广义相对论粘性流体动力学的宇宙学后果
DOI:
10.1103/physrevd.107.023512
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发表时间:
2023
影响因子:
5
通讯作者:
Scherrer, Robert J.
中科院分区:
文献类型:
--
作者:
Bemfica, Fábio S.;Disconzi, Marcelo M.;Noronha, Jorge;Scherrer, Robert J.
We investigate the out-of-equilibrium dynamics of viscous fluids in a spatially flat Friedmann-Lemaître-Robertson-Walker cosmology using the most general causal and stable viscous energy-momentum tensor defined at first order in spacetime derivatives. In this new framework a pressureless viscous fluid having equilibrium energy densitycan evolve to an asymptotic future solution in which the Hubble parameter approaches a constant while, even in the absence of a cosmological constant (i.e.,). Thus, while viscous effects in this model drive an accelerated expansion of the universe, the equilibrium energy density itself vanishes, leaving behind only the acceleration. This behavior emerges as a consequence of causality in first-order theories of relativistic fluid dynamics and it is fully consistent with Einstein’s equations.
影响因子:
3.5
作者:
MAARTENS, R
通讯作者:
MAARTENS, R
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
N. Cruz;E. González;G. Palma
通讯作者:
G. Palma