Domestic Corpuscular Inflaton

Abstract

The aim of this paper is to provide a more precise description of the paradigm of corpuscular slow-roll inflation, which was previously introduced by Casadio et al. in [1]. Specifically, we start by expanding the Starobinsky theory on a curved background and then infer the number and nature of the propagating degrees of freedom, both in the true inflationary phase and in a quasi-de Sitter approximation. We correctly find that the particle spectrum contains a transverse trace-free mode and a scalar one. The scalar mode displays a tachyonic nature during the slow-roll phase, due to the instability of the system, whereas it acquires the appropriate oscillatory behavior as the background approaches a critical value of the curvature. These results confirm the fact that the Einstein-Hilbert term acts as a perturbation to the quadratic one, and is responsible for driving the early universe out of the inflationary phase, thus realising the inflaton field in terms of pure (corpuscular) gravity.

arXiv comment14 pages, no figures

References in corpus (22)

• f(R) Theories Of Gravity
• f(R) theories
• Extended Theories of Gravity
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results
• Towards the Theory of Reheating After Inflation
• Reheating after Inflation
• Cosmological inflation in $F(R,\mathcal{G})$ gravity
• Quantum Compositeness of Gravity: Black Holes, AdS and Inflation
• Black Hole's 1/N Hair
• Aspects of Quadratic Gravity
• Occurrence of exact $R^2$ inflation in non-local UV-complete gravity
• Massive Gravity on de Sitter and Unique Candidate for Partially Massless Gravity
• Matter and gravitons in the gravitational collapse
• Effective Fluid Description of the Dark Universe
• Quantum corpuscular corrections to the Newtonian potential
• Emergence of a Dark Force in Corpuscular Gravity
• Thermal corpuscular black holes
• f(R) Gravity and its Cosmological Implications
• Thermal BEC black holes
• Corpuscular slow-roll inflation
• Consistent Cosmic Microwave Background Spectra from Quantum Depletion
• A Unified Universe

Cited by in corpus (2)

• Wyman's "other" scalar field solution, Sultana's generalization, and their Brans-Dicke and $R^2$ relatives
• Quantum Formation of Primordial Black holes