Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP01(2022)074
Keywords
Classical Theories of Gravity; Cosmology of Theories beyond the SM; Effective Field Theories
Categories
Funding
- Contrato de Atraccion de Talento (Modalidad 1) de la Comunidad de Madrid (Spain) [2017-T1/TIC-5520]
- IFT Centro de Excelencia Severo Ochoa [SEV-2016-0597]
- MCIU (Spain) [PGC2018-096646-A-I00]
- Simons Foundation [555117]
Ask authors/readers for more resources
This paper studies the mechanisms for generating a large power spectrum within the effective theory of single-field inflation, which is necessary for the formation of primordial black holes. The mechanisms considered include a transition into a ghost-inflation-like phase and scenarios where an exponentially growing mode is temporarily turned on. The enhancement in the power spectrum results from either a swift change in some effective coupling or a modification of the dispersion relation for the perturbations, while the background evolution remains unchanged and approximately de Sitter throughout inflation. The weakly broken galileon symmetry guarantees the robustness of the results.
We study the generation of a large power spectrum, necessary for primordial black hole formation, within the effective theory of single-field inflation. The mechanisms we consider include a transition into a ghost-inflation-like phase and scenarios where an exponentially growing mode is temporarily turned on. In the cases we discuss, the enhancement in the power spectrum results from either a swift change in some effective coupling or a modification of the dispersion relation for the perturbations, while the background evolution remains unchanged and approximately de Sitter throughout inflation. The robustness of the results is guaranteed thanks to a weakly broken galileon symmetry, which protects the effective couplings against large quantum corrections. We discuss how the enhancement of the power spectrum is related to the energy scale of the operators with weakly broken galileon invariance, and study the limits imposed by strong coupling and the validity of the perturbative expansion.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available