Covi, Laura

[["dc.bibliographiccitation.firstpage","064"],["dc.bibliographiccitation.issue","09"],["dc.bibliographiccitation.journal","Journal of Cosmology and Astroparticle Physics"],["dc.bibliographiccitation.volume","2022"],["dc.contributor.affiliation","Covi, Laura;"],["dc.contributor.affiliation","Khan, Sarif;"],["dc.contributor.author","Covi, Laura"],["dc.contributor.author","Khan, Sarif"],["dc.date.accessioned","2022-12-01T08:31:05Z"],["dc.date.available","2022-12-01T08:31:05Z"],["dc.date.issued","2022"],["dc.date.updated","2022-11-11T13:13:20Z"],["dc.description.abstract","Abstract\r\n \r\n In the Standard Model a Dark Matter candidate is missing, but it is relatively\r\n simple to enlarge the model including one or more suitable particles.\r\n We consider in this paper one such extension, inspired by simplicity and\r\n by the goal to solve more than just the Dark Matter issue.\r\n Indeed we consider a local U(1) extension of the SM providing an\r\n axion particle to solve the strong CP problem and including RH neutrinos\r\n with appropriate mass terms. One of the latter is decoupled from the SM\r\n leptons and can constitute stable sterile neutrino DM.\r\n In this setting, the PQ symmetry arises only as an accidental symmetry\r\n but its breaking by higher order operators is sufficiently suppressed to\r\n avoid introducing a large\r\n θ\r\n contribution.\r\n The axion decay constant and the RH neutrino masses are related\r\n to the same v.e.v.s and the PQ scale and both DM densities are determined by\r\n the parameters of the axion and scalar sector.\r\n The model predicts in general a mixed Dark Matter\r\n scenario with both axion and sterile neutrino DM and is characterised by\r\n a reduced density and observational signals from each single component."],["dc.identifier.doi","10.1088/1475-7516/2022/09/064"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/118070"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-621"],["dc.relation.eissn","1475-7516"],["dc.rights.uri","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Axion and FIMP dark matter in a 𝖴(1) extension of the Standard Model"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","193"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Journal of High Energy Physics"],["dc.bibliographiccitation.volume","2019"],["dc.contributor.author","Biswas, Anirban"],["dc.contributor.author","Choubey, Sandhya"],["dc.contributor.author","Covi, Laura"],["dc.contributor.author","Khan, Sarif"],["dc.date.accessioned","2021-11-22T14:31:46Z"],["dc.date.available","2021-11-22T14:31:46Z"],["dc.date.issued","2019"],["dc.description.abstract","In this work, we explain three beyond standard model (BSM) phenomena, namely neutrino masses, the baryon asymmetry of the Universe and Dark Matter, within a single model and in each explanation the right handed (RH) neutrinos play the prime role. Indeed by just introducing two RH neutrinos we can generate the neutrino masses by the Type-I seesaw mechanism. The baryon asymmetry of the Universe can arise from thermal leptogenesis from the decay of lightest RH neutrino before the decoupling of the electroweak sphaleron transitions, which redistribute the B − L number into a baryon number. At the same time, the decay of the RH neutrino can produce the Dark Matter (DM) as an asymmetric Dark Matter component. The source of CP violation in the two sectors is exactly the same, related to the complex couplings of the neutrinos. By determining the comoving number density for different values of the CP violation in the DM sector, we obtain a particular value of the DM mass after satisfying the relic density bound. We also give prediction for the DM direct detection (DD) in the near future by different ongoing DD experiments."],["dc.identifier.doi","10.1007/JHEP05(2019)193"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16224"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/93401"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.relation","info:eu-repo/grantAgreement/EC/H2020/690575/EU//InvisiblesPlus"],["dc.relation","info:eu-repo/grantAgreement/EC/H2020/674896/EU//ELUSIVES"],["dc.relation.eissn","1029-8479"],["dc.rights","CC BY 4.0"],["dc.rights.access","openAccess"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject","Cosmology of Theories beyond the SM; Neutrino Physics"],["dc.subject.ddc","530"],["dc.title","Common origin of baryon asymmetry, Dark Matter and neutrino mass"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

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