Gauge singlet scalar as inflaton and thermal relic dark matter
- Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB (United Kingdom)
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{sub s},m{sub 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{sub h}. The range of Higgs mass compatible with the constraints is 145 GeV < or approx. m{sub h} < or approx. 170 GeV. The S mass lies in the range 45 GeV < or approx. m{sub s} < or approx.1 TeV for the case of a real S scalar with large quartic self-coupling {lambda}{sub s}, with a smaller upper bound for smaller {lambda}{sub s}. A region of the parameter space is accessible to direct searches at the LHC via h{yields}SS, while future direct dark matter searches should be able to significantly constrain the model.
- OSTI ID:
- 21313562
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 80, Issue 12; Other Information: DOI: 10.1103/PhysRevD.80.123507; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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