# name
On Natural Inﬂation with an Extra Scalar Field

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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutor: Alessio Notari

# metadata.dc.description.abstract[].value
The goal of this work is to study an extra feature of an inﬂationary model, the so-called Natural Inﬂation (NI) model, that could possibly describe the early stages of evolution of the universe. We will study the consequence of an additional coupling of the inﬂaton φ with a second scalar ﬁeld χ, that respects the shift symmetry of NI for φ. To study the system we ﬁrst present some preliminary theoretical concepts about classical ﬁeld theory and about deriving the equations of motion from action principles in general relativity. Then, we will show that χ has exponentially growing solutions, such that that the inﬂationary period is shortened, for a given range of parameters. This could modify the observable predictions of NI

# metadata.dc.title[].value
On Natural Inﬂation with an Extra Scalar Field