Radiative Corrections in Curved Spacetime and Physical Implications to the Power Spectrum and Trispectrum for different Inflationary Models

Dresti, Simone

dc.contributor.advisor	Covi, Laura Prof. Dr.
dc.contributor.author	Dresti, Simone
dc.date.accessioned	2018-06-26T09:04:20Z
dc.date.available	2018-06-26T09:04:20Z
dc.date.issued	2018-06-26
dc.identifier.uri	http://hdl.handle.net/11858/00-1735-0000-002E-E432-4
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-6930
dc.language.iso	eng	de
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc	530	de
dc.title	Radiative Corrections in Curved Spacetime and Physical Implications to the Power Spectrum and Trispectrum for different Inflationary Models	de
dc.type	doctoralThesis	de
dc.contributor.referee	Covi, Laura Prof. Dr.
dc.date.examination	2018-05-23
dc.subject.gok	Physik (PPN621336750)	de
dc.description.abstracteng	In a quantum field theory with a time-dependent background, as in an expanding universe, the time-translational symmetry is broken. We therefore expect loop corrections to cosmological observables to be time-dependent after renormalization for interacting fields. In this thesis we compute and discuss such radiative corrections to the primordial spectrum and higher order spectra in simple inflationary models. We investigate both massless and massive virtual fields, and we disentangle the time dependence caused by the background and by the initial state that is set to the Bunch-Davies vacuum at the beginning of inflation. For the investigated models, we find that the radiative corrections to the primordial spectrum result in oscillatory features that are not present at tree-level. These features are also present in higher order spectra and depend on the initial conditions of the theory. In all the investigated cases the departure from near-scale invariance and from Gaussianity is very small and it is in full agreement with the current Planck constraints. Future cosmic microwave background measurements may improve the current limits on feature-full primordial spectra, giving the hope to observe these effects in the scenario of hybrid inflation.	de
dc.contributor.coReferee	Bahns, Dorothea Prof. Dr.
dc.subject.eng	Primordial Power Spectrum	de
dc.subject.eng	Trispectrum	de
dc.subject.eng	Inflationary Perturbations	de
dc.subject.eng	Inflaton Field	de
dc.subject.eng	Slow-Roll Inflation	de
dc.subject.eng	Hybrid Inflation	de
dc.subject.eng	Chaotic Inflation	de
dc.subject.eng	Non-Linearity Parameter	de
dc.subject.eng	De-Sitter Spacetime	de
dc.subject.eng	Renormalization in Curved Spacetime	de
dc.subject.eng	Radiative Corrections	de
dc.subject.eng	Finite Time Contributions	de
dc.subject.eng	CTP Formalism	de
dc.subject.eng	WKB Propagator	de
dc.subject.eng	Hypergeometric Propagator	de
dc.identifier.urn	urn:nbn:de:gbv:7-11858/00-1735-0000-002E-E432-4-4
dc.affiliation.institute	Fakultät für Physik	de
dc.identifier.ppn	1025240480

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