2006/03/20 by Eduardo Guendelman, E. I. Guendelman, Guendelman, E. I. +3
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #Earth Systems and Cosmic Evolution #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Relativity and Gravitational Theory #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.48550/arxiv.hep-th/0603150
47 pages, 28 figures
arxiv created 2006/03/20 · openalex publication_date 2006/03/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the scalar sector of the Two Measures Field Theory (TMT) model in the context of cosmological dynamics. The scalar sector includes the inflaton ϕand the Higgs υ fields. The model possesses gauge and scale invariance. The latter is spontaneously broken due to intrinsic features of the TMT dynamics. In the model with the inflaton ϕalone, in different regions of the parameter space the following different effects can take place without fine tuning of the parameters and initial conditions: a) Possibility of resolution of the old cosmological constant problem: this is done in a consistent way hinted by S. Weinberg in his comment concerning the question of how one can avoid his no-go theorem. b) The power law inflation without any fine tuning may end with damped oscillations of ϕ around the state with zero cosmological constant. c) There are regions of the parameters where the equation-of-state w=p/ρin the late time universe is w≠ 0 soon after the end of a power law inflation; there are two oscillatory regimes of υ, one around υ =0 at 50 e-folding before the end of inflation, another - during transition to a gauge symmetry broken phase where the scalar dark energy density approaches zero without fine tuning; the gauge symmetry breakdown is achieved without tachyonic mass term in the action.