000459889 001__ 459889
000459889 005__ 20231024211316.0
000459889 0247_ $$2datacite_doi$$a10.3204/PUBDB-2021-02808
000459889 037__ $$aPUBDB-2021-02808
000459889 041__ $$aEnglish
000459889 088__ $$2DESY$$aDESY-THESIS-2021-010
000459889 1001_ $$0P:(DE-H253)PIP1083076$$aDepta, Paul Frederik$$b0$$eCorresponding author$$gmale$$udesy
000459889 245__ $$aDark Sector Cosmologies: Evolution and Constraints$$f2018-01-01 - 2021-06-21
000459889 260__ $$aHamburg$$bVerlag Deutsches Elektronen-Synchrotron DESY$$c2021
000459889 300__ $$a179
000459889 3367_ $$2DataCite$$aOutput Types/Dissertation
000459889 3367_ $$0PUB:(DE-HGF)3$$2PUB:(DE-HGF)$$aBook$$mbook
000459889 3367_ $$2ORCID$$aDISSERTATION
000459889 3367_ $$2BibTeX$$aPHDTHESIS
000459889 3367_ $$02$$2EndNote$$aThesis
000459889 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1698151087_1199860
000459889 3367_ $$2DRIVER$$adoctoralThesis
000459889 4900_ $$aDESY-THESIS
000459889 502__ $$aDissertation, Universtät Hamburg, 2021$$bDissertation$$cUniverstät Hamburg$$d2021$$o2021-06-21
000459889 520__ $$aMany models of dark matter place their dark matter candidate inside a broader dark sector with other particles and fields for theoretical and phenomenological reasons. The cosmological evolution of these dark sectors can differ significantly from standard scenarios, in particular due to their interplay with the Standard Model of particle physics. In this thesis, we study various dark sector cosmologies, including their evolution and resulting constraints. In view of ever more stringent limits from direct and indirect searches on dark matter as a thermal relic from the primordial plasma encompassing the SM particles, scenarios of a dark sector decoupled from the Standard Model receive increasing interest. Interestingly, the corresponding dark matter production mechanism of thermal freeze-out can also occur entirely in a decoupled dark sector. Still, certain modifications to the standard treatment need to be taken into account. We study these changes and find significant deviations of the annihilation cross-section required to obtain the observed dark matter abundance, in particular if the dark matter particle and its annihilation product are similar in mass. After the first gravitational waves were observed by the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO), interest in primordial black holes as a candidate for dark matter has been renewed. As gravitational waves can be produced in primordial black hole binary mergers, this setup can be considered a dark sector with purely gravitational interactions. Large initial primordial black hole clustering has been suggested to circumvent the strong limits on this scenario. We show that instead, gravitational wave constraints are enhanced by large clustering such that highly clustered primordial black holes with the masses corresponding to the LIGO events cannot account for all of the dark matter in the Universe. A major part of this thesis studies Big Bang Nucleosynthesis (BBN) as a probe for MeV-scale dark sectors. Due to the remarkable agreement of predictions for the primordial light element abundances from BBN with observations, alterations are generally strongly constrained. Dark sectors can change the predictions for the primordial light element abundances by the influence of their cosmological evolution during BBN itself and subsequent disintegration processes, e.g. photodisintegration. The former proceed via alterations of the Hubble rate, neutrino decoupling, the time-temperature relation, and the best-fit value for the baryon-to-photon ratio. The latter are due to late-time high-energy electromagnetic injections into the Standard Model plasma, which induce an electromagnetic cascade producing an abundance of non-thermal photons that can disintegrate light nuclei. We derive these constraints for annihilations of MeV-scale dark matter, electromagnetic decays of MeV-scale dark sector particles, and axion-like particles coupled to photons.
000459889 536__ $$0G:(DE-HGF)POF4-611$$a611 - Fundamental Particles and Forces (POF4-611)$$cPOF4-611$$fPOF IV$$x0
000459889 536__ $$0G:(EU-Grant)638528$$aNewAve - New avenues towards solving the dark matter puzzle (638528)$$c638528$$fERC-2014-STG$$x1
000459889 536__ $$0G:(DE-HGF)2015_IFV-VH-GS-500$$aPHGS, VH-GS-500 - PIER Helmholtz Graduate School (2015_IFV-VH-GS-500)$$c2015_IFV-VH-GS-500$$x2
000459889 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0
000459889 7001_ $$0P:(DE-H253)PIP1022003$$aSchmidt-Hoberg, Kai$$b1$$eThesis advisor
000459889 8564_ $$uhttps://bib-pubdb1.desy.de/record/459889/files/PhD_Thesis_Paul_Frederik_Depta.pdf$$yOpenAccess
000459889 8564_ $$uhttps://bib-pubdb1.desy.de/record/459889/files/desy-thesis-21-010.title.pdf$$yOpenAccess
000459889 8564_ $$uhttps://bib-pubdb1.desy.de/record/459889/files/PhD_Thesis_Paul_Frederik_Depta.pdf?subformat=pdfa$$xpdfa$$yOpenAccess
000459889 8564_ $$uhttps://bib-pubdb1.desy.de/record/459889/files/desy-thesis-21-010.title.pdf?subformat=pdfa$$xpdfa$$yOpenAccess
000459889 909CO $$ooai:bib-pubdb1.desy.de:459889$$pdnbdelivery$$popenaire$$pec_fundedresources$$pVDB$$pdriver$$popen_access
000459889 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1083076$$aDeutsches Elektronen-Synchrotron$$b0$$kDESY
000459889 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1022003$$aDeutsches Elektronen-Synchrotron$$b1$$kDESY
000459889 9131_ $$0G:(DE-HGF)POF4-611$$1G:(DE-HGF)POF4-610$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lMatter and the Universe$$vFundamental Particles and Forces$$x0
000459889 9141_ $$y2021
000459889 915__ $$0StatID:(DE-HGF)0510$$2StatID$$aOpenAccess
000459889 920__ $$lyes
000459889 9201_ $$0I:(DE-H253)T-20120731$$kT$$lTheorie-Gruppe$$x0
000459889 980__ $$aphd
000459889 980__ $$aVDB
000459889 980__ $$abook
000459889 980__ $$aI:(DE-H253)T-20120731
000459889 980__ $$aUNRESTRICTED
000459889 9801_ $$aFullTexts