Instant preheating in a scale invariant two measures theory

Abstract

The instant preheating mechanism in the framework of a scale invariant two measures theory is studied. We introduce this mechanism into a non oscillating inflationary model as another possible solution to the reheating of the universe in this theory. In this framework, we consider that the model includes two scalar matter fields, the first a dilaton field, that transforms under scale transformations and it will be considered also as the field that drives inflation and the second, a scalar field which will interact with the inflaton through an effective potential. By assuming this interaction term, we obtain a scenario of instant radiation or decay of particles according to the domain the effective mass of the field that interacts with the inflaton. Also, we consider a scale invariant Yukawa interaction and then after performing the transition to the physical Einstein frame we obtain an expression for the decay rate from our scalar field going into two fermions. Besides, from specific decay rates, different constraints and bounds for the coupling parameters associated with our model are found.

24 pages

References in corpus (10)

• Reheating in Inflationary Cosmology: Theory and Applications
• Ricci Reheating
• Emergent Cosmology, Inflation and Dark Energy
• Reheating in quintessential inflation via gravitational production of heavy massive particles: A detailed analysis
• Curvaton reheating allows TeV Hubble scale in NO inflation
• Curvaton field and intermediate inflationary universe model
• Quintessential Inflation from Lorentzian Slow Roll
• Extended Curvaton reheating in inflationary models
• General relativity as an extended canonical gauge theory
• The spectrum of Gravitational Waves, their overproduction in quintessential inflation and its influence in the reheating temperature

Cited by in corpus (4)

• Unifying Inflation with early and late Dark Energy in Multi-Fields: Spontaneously broken scale invariant TMT
• Relic gravitons from stiff curvature perturbations
• Exploring Cosmological Implications of the Modified Raychaudhuri Equation in Non-Gravitating Vacuum Energy Theory
• Inflation in a scalar-vector gravity theory