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Title: | Natural in ation with a periodic non-minimal coupling to gravity |
Author: | Simeon Miquel, Guillem |
Director/Tutor: | Notari, Alessio |
Keywords: | Expansió de l'univers Relativitat general (Física) Treballs de fi de grau Expanding universe General relativity (Physics) Bachelor's theses |
Issue Date: | Jun-2018 |
Abstract: | Natural Inflation is a model for inflation where the potential of the inflaton is V (φ) = ∧4[1 + cos(φ/ ∫ )] and thus exhibits a discrete shift symmetry φ - φ + 2π∫ . Successful inflation can be chieved if ∫ > ∼ few MPl and ∧ ∼ mGUT ∼ 1016 GeV. However, the latest observational constraints put Natural Inflation in tension with data. We propose in this letter the introduction of a non-minimal coupling to gravity Υ2(φ)R that respects the characteristic shift symmetry and the periodicity of the potential. We show that the agreement with cosmological data can be substantially improved, obtaining a scale ∧ ∼ 1015 ∼ 1016 GeV, and furthermore, in certain cases, successful inflation can be achieved even for a periodicity scale smaller than the Planck scale |
Note: | Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2018, Tutor: Alessio Notari |
URI: | http://hdl.handle.net/2445/125262 |
Appears in Collections: | Treballs Finals de Grau (TFG) - Física |
Files in This Item:
File | Description | Size | Format | |
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Simeon Miquel Guillem.pdf | 464.18 kB | Adobe PDF | View/Open |
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