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[{"key": "dc.contributor.advisor", "value": "Nurmi, Sami", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Jutila, Henri", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-06-20T06:16:14Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-06-20T06:16:14Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2019", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/64740", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Kosmologiset havainnot kuten: galaksien rotaatiok\u00e4yrien k\u00e4ytt\u00e4ytyminen, kosmisen\ntaustas\u00e4teilyn yksityiskohdat ja gravitaatiolinssiefektiin perustuvat galaksijoukkojen\nmassajakaumat tukevat pime\u00e4n aineen olemassaoloa. Havainnot antavat\nymm\u00e4rt\u00e4\u00e4, ett\u00e4 pime\u00e4\u00e4 ainetta on viisinkertainen m\u00e4\u00e4r\u00e4 baryoniseen aineeseen\nverrattuna, joka vuorovaikuttaa vain gravitaation kautta. Suurin osa pime\u00e4st\u00e4\naineesta oletetaan olevan ei-baryonista ja koostuvan standardimallin ulkopuolisista\nhiukkasista. Kosmologisista havainnoista huolimatta pime\u00e4n aine pysyy n\u00e4kym\u00e4tt\u00f6miss\u00e4\nmaailmankaikkeuden kulissien takana, sill\u00e4 sit\u00e4 ei ole pystytty kokeellisesti\nhavaitsemaan. Pime\u00e4n aineen voidaan olettaa olevan termisess\u00e4 tasapainossa varhaisessa\nmaailmankaikkeudessa ja syntyneen samalla tavalla kuten kevyet reliikit\ntermisen freeze-out mekanismin kautta. N\u00e4in syntynytt\u00e4 pime\u00e4 aine -hiukkasta\nkutsutaan WIMPiksi (Weakly Interactive Massive Particle). Pime\u00e4 aine voi my\u00f6s\nolla syntynyt vaihtoehtoisesti ei-termisesti freeze-in mekanismin kautta. T\u00e4ll\u00e4\ntavalla syntynytt\u00e4 pime\u00e4 aine -hiukkasta kutsutaan FIMPiksi (Feebly Interactive\nMassive Particle). T\u00e4ss\u00e4 tapauksessa pime\u00e4 aine ei miss\u00e4\u00e4n vaiheessa saavuta termist\u00e4\ntasapainoa, koska kytkenn\u00e4t muihin hiukkasiin ovat hyvin heikkoja. T\u00e4ss\u00e4\ntutkielmassa tarkastellaan molempia syntytapoja pit\u00e4en p\u00e4\u00e4painon freeze-in mekanismissa.\n1 \u2192 2 hajonnan ja 2 \u2192 2 sironnan analyyttiset ja numeeriset ratkaisut\nm\u00e4\u00e4ritet\u00e4\u00e4n pime\u00e4n aineen hiukkastiheydelle, joka on syntynyt freeze-in mekanismin\nkautta. Ratkaisut pime\u00e4n aineen energiatiheydelle vaadittavilla kytkenn\u00f6ill\u00e4\nesitet\u00e4\u00e4n vastaaville prosesseille.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Cosmological observations such as behavior of galaxy rotation curves, details of the\ncosmic microwave background and mass distribution of galaxy clusters based on\ngravitational lensing support the existence of dark matter. Observations indicate,\nthat dark matter interacts only through gravity and outweighs baryonic matter\nfive to one. Majority of dark matter is expected to be non-baryonic and composed\nof particles beyond Standard Model. Despite the various cosmological observations,\ndark matter remains hidden behind the scenes of the Universe, since there\nis no confirmed positive signal from experiments aiming to detect dark matter. In\nthe early universe dark matter can be assumed to be in thermal equilibrium and\nproduced similarly to light relics through thermal freeze-out mechanism involving\nWeakly Interacting Massive Particle (WIMP). Dark matter can also be produced\nalternatively non-thermally via freeze-in mechanism, involving Feebly Interacting\nMassive Particle (FIMP). In this case dark matter never attains thermal equilibrium,\nsince the couplings to other particles are extremely weak. In this thesis both\nmechanisms are studied with main focus on freeze-in. Analytical and numerical\nsolutions to the comoving number density of dark matter produced via freeze-in\nis determined for 1 \u2192 2 decay and for 2 \u2192 2 scattering. Solution to the dark\nmatter energy density with required couplings are presented for the corresponding\nprocesses.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2019-06-20T06:16:14Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-06-20T06:16:14Z (GMT). No. of bitstreams: 0\n Previous issue date: 2019", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "92", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "freeze-out", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "WIMP", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "freeze-in", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "FIMP", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "FIMP dark matter genesis produced via non-thermal freeze-in mechanism", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201906203328", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Teoreettinen fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Theoretical Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4024", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "pime\u00e4 aine", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kosmologia", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "dark matter", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "cosmology", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}]
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