Higgs inflation and higher-order gravity in Palatini formulation

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dc.contributor Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta fi
dc.contributor University of Helsinki, Faculty of Science en
dc.contributor Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten sv
dc.contributor.author Annala, Jaakko
dc.date.issued 2020
dc.identifier.uri URN:NBN:fi:hulib-202005292527
dc.identifier.uri http://hdl.handle.net/10138/315503
dc.description.abstract We study how higher-order gravity affects Higgs inflation in the Palatini formulation. We first review the metric and Palatini formulations in comparative manner and discuss their differences. Next cosmic inflation driven by a scalar field and inflationary observables are discussed. After this we review the Higgs inflation and compute the inflationary observables both in the metric and Palatini formulations. We then consider adding higher-order terms of the curvature to the action. We derive the equations of motion for the most general action quadratic in the curvature that does not violate parity in both the metric and Palatini formulations. Finally we present a new result. We analyse Higgs inflation in the Palatini formulation with higher-order curvature terms. We consider a simplified scenario where only terms constructed from the symmetric part of the Ricci tensor are added to the action. This implies that there are no new gravitational degrees of freedom, which makes the analysis easier. As a new result we found out that the scalar perturbation spectrum is unchanged, but the tensor perturbation spectrum is suppressed by the higher-order curvature couplings. en
dc.language.iso eng
dc.publisher Helsingin yliopisto fi
dc.publisher University of Helsinki en
dc.publisher Helsingfors universitet sv
dc.subject cosmology
dc.subject inflation
dc.subject Higgs
dc.subject modifications of gravity
dc.subject Palatini formulation
dc.title Higgs inflation and higher-order gravity in Palatini formulation en
dc.type.ontasot pro gradu -tutkielmat fi
dc.type.ontasot master's thesis en
dc.type.ontasot pro gradu-avhandlingar sv
dc.subject.discipline none und
dct.identifier.urn URN:NBN:fi:hulib-202005292527
dc.subject.specialization Alkeishiukkasfysiikka ja kosmologia fi
dc.subject.specialization Particle Physics and Cosmology en
dc.subject.specialization Elementarpartikelfysik och kosmologi sv
dc.subject.degreeprogram Alkeishiukkasfysiikan ja astrofysikaalisten tieteiden maisteriohjelma fi
dc.subject.degreeprogram Master's Programme in Particle physics and Astrophysical Sciences en
dc.subject.degreeprogram Magisterprogrammet i elementarpartikelfysik och astrofysikaliska vetenskaper sv

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