Isotropy theorem for arbitrary-spin cosmological fields



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López Maroto, Antonio and Ruiz Cembranos, José Alberto and Nuñez Jareño, Santos José (2014) Isotropy theorem for arbitrary-spin cosmological fields. Journal of Cosmology and Astroparticle Physics (3). ISSN 1475-7516

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We show that the energy-momentum tensor of homogeneous fields of arbitrary spin in an expanding universe is always isotropic in average provided the fields remain bounded and evolve rapidly compared to the rate of expansion. An analytic expression for the average equation of state is obtained for Lagrangians with generic power-law kinetic and potential terms. As an example we consider the behavior of a spin-two field in the standard Fierz-Pauli theory of massive gravity. The results can be extended to general space-time geometries for locally inertial observers.

Item Type:Article
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© 2014 IOP Publishing Ltd.
This work has been supported by MICINN (Spain) project numbers FIS2011-23000, FPA2011-27853-01 and Consolider Ingenio MULTIDARK CSD2009-00064.

Uncontrolled Keywords:Abelian Gauge-Fields, Yang-Mills Fields, Inflation, Universe, Flation
Subjects:Sciences > Physics
ID Code:25929
Deposited On:24 Jun 2014 16:24
Last Modified:31 Dec 2020 00:03

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