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Cosmological consequences of first-order general-relativistic viscous fluid dynamics

Journal Article · · Physical Review. D.
 [1];  [2];  [3];  [2]
  1. Federal Univ. of Rio Grande do Norte, Natal (Brazil); Vanderbilt University
  2. Vanderbilt Univ., Nashville, TN (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States)
In this work, we investigate the out-of-equilibrium dynamics of viscous fluids in a spatially flat Friedmann-LemaîtreRobertson-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 density ρ can evolve to an asymptotic future solution in which the Hubble parameter approaches a constant while ρ → 0, even in the absence of a cosmological constant (i.e., Λ = 0). 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.
Research Organization:
University of Illinois at Urbana-Champaign, IL (United States); Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0019207; SC0021301
OSTI ID:
1968446
Alternate ID(s):
OSTI ID: 2283622
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 2 Vol. 107; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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