Towards Inflation and Accelerating Cosmologies in String-Generated Gravity Models

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dc.creatorNeupane, Ishwaree P
dc.date2006-05-29
dc.date.accessioned2026-07-07T07:13:37Z
dc.date.available2026-07-07T07:13:37Z
dc.descriptionThe string $α^\prime$-correction to the usual Einstein action comprises a Gauss-Bonnet integrand multiplied by non-trivial functions of the modulus field $χ$ and/or the dilaton field $ϕ$. We discuss how the presence of such terms in the four dimensional effective action can explain several novel phenomena, such as a four-dimensional flat Friedmann-Robertson-Walker universe undergoing a cosmic inflation at the early epoch, as well as a cosmic acceleration at late times. The model predicts, during inflation, spectra of both density perturbations and gravitational waves that may fall well within the experimental bounds. The model therefore provides a unified approach for explaining the early and late time accelerating phases of the universe.
dc.description8 pages, 3 figures; Based on a Talk given at the XL Rencontre de Moriond
dc.identifierhttps://arxiv.org/abs/hep-th/0605265
dc.identifierhttp://arxiv.org/abs/hep-th/0605265
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/112534
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleTowards Inflation and Accelerating Cosmologies in String-Generated Gravity Models
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