lunes, 25 de febrero de 2013

Can Standard Model Higgs Seed the Formation of Structures in Our Universe?

(Submitted on 11 Sep 2012 (v1), last revised 19 Jan 2013 (this version, v2))

We study the Standard Model Higgs field as a source for the primordial curvature perturbation, particularly in the curvaton and modulated reheating scenario. We conclude that the Higgs cannot play as a curvaton due to the small energy density when it decays, however the modulated reheating by Higgs can be a viable scenario. In the latter case, the non-Gaussianity is inevitably generated and strongly constrains the type of potential of inflaton field and Higgs-dependent interaction term. For the quadratic potential of the inflaton field with decay rate which non-linearly depends on the Higgs vacuum expectation value, the contribution of Higgs field to the primordial curvature perturbation must be less than 8%.

Comments:	12 pages; version accepted for publication in Phys.Rev.D
Subjects:	High Energy Physics - Phenomenology (hep-ph); Cosmology and Extragalactic Astrophysics (astro-ph.CO); High Energy Physics - Theory (hep-th)
Cite as:	arXiv:1209.2277 [hep-ph]
	(or arXiv:1209.2277v2 [hep-ph] for this version)