Must cosmological perturbations remain nonadiabatic after multifield inflation?

Journal Article · Fri Oct 15 00:00:00 EDT 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.083522· OSTI ID:20705456

Weinberg, Steven ^[1]

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1. Theory Group, Department of Physics, University of Texas, Austin, Texas 78712 (United States)

Even if nonadiabatic perturbations are generated in multifield inflation, the perturbations will become adiabatic if the Universe after inflation enters an era of local thermal equilibrium, with no nonzero conserved quantities, and will remain adiabatic as long as the wavelength is outside the horizon, even when local thermal equilibrium no longer applies. Small initial nonadiabatic perturbations associated with imperfect local thermal equilibrium remain small when baryons are created from out-of-equilibrium decay of massive particles, or when dark matter particles go out of local thermal equilibrium.

• OSTI ID: 20705456
• Journal Information: Physical Review. D, Particles Fields, Vol. 70, Issue 8; Other Information: DOI: 10.1103/PhysRevD.70.083522; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
COSMOLOGY
DISTURBANCES
INFLATIONARY UNIVERSE
NONLUMINOUS MATTER
PARTICLE DECAY
PERTURBATION THEORY
THERMAL EQUILIBRIUM
UNIVERSE
WAVELENGTHS