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Gauge singlet scalar as inflaton and thermal relic dark matter

Research output: Contribution to journalJournal article

Published

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Journal publication date8/12/2009
JournalPhysical Review D
Journal number12
Volume80
Number of pages14
Original languageEnglish

Abstract

We show that, by adding a gauge singlet scalar S to the standard model which is nonminimally coupled to gravity, S can act both as the inflaton and as thermal relic dark matter. We obtain the allowed region of the (m_s, m_h) parameter space which gives a spectral index in agreement with observational bounds and also produces the observed dark matter density while not violating vacuum stability or nonperturbativity constraints. We show that, in contrast to the case of Higgs inflation, once quantum corrections are included the spectral index is significantly larger than the classical value (n = 0.966 for N = 60) for all allowed values of the Higgs mass m_h. The range of Higgs mass compatible with the constraints is 145 GeV SS, while future direct dark matter searches should be able to significantly constrain the model.

Bibliographic note

© 2009 The American Physical Society 13 pages, 7 figures. Published version