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Title: Natural in ation with a periodic non-minimal coupling to gravity
Author: Simeon Miquel, Guillem
Director: Notari, Alessio
Keywords: Expansió de l'univers
Relativitat general (Física)
Treballs de fi de grau
Expanding universe
General relativity (Physics)
Bachelor's thesis
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
Appears in Collections:Treballs Finals de Grau (TFG) - Física

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