Does inflationary particle production suggest Ωm <1?

Sahni, Varun ; Habib, Salman (1998) Does inflationary particle production suggest Ωm <1? Physical Review Letters, 81 (8). pp. 1766-1769. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v81/i9/p1766_1

Related URL: http://dx.doi.org/10.1103/PhysRevLett.81.1766

Abstract

We study a class of Friedmann-Robertson-Walker spacetimes with a nonminimally coupled light massive scalar field. Values of the coupling parameter ξ<0 enhance long range power in the vacuum expectation value of the energy-momentum tensor <Tμν> and fundamentally alter the nature of inflationary particle production: the energy density of created particles behaves like an effective cosmological constant, leading generically to Ωm<1 in clustered matter and providing a possible resolution of the "Ω problem" for low density cosmological models.

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