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[{"key": "dc.contributor.advisor", "value": "Kainulainen, Kimmo", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Parkkinen, Harri", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2020-12-09T11:40:59Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2020-12-09T11:40:59Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2020", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/73066", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Edetess\u00e4\u00e4n v\u00e4liaineessa neutriinojen ja materian v\u00e4lill\u00e4 tapahtuu kahdenlaisia t\u00f6rm\u00e4yksi\u00e4:\nkoherentteja ja ep\u00e4koherentteja t\u00f6rm\u00e4yksi\u00e4. Koherentit t\u00f6rm\u00e4ykset aiheuttavat\ntaustapotentiaalin, joka muuttaa neutriinojen ominaisenergioita. Ep\u00e4koherentit\nt\u00f6rm\u00e4ykset aiheuttavat puolestaan kvanttivaimennustekij\u00f6it\u00e4, jotka vaikuttavat\nneutriinotilojen dynaamiseen kehitykseen.\nT\u00e4ss\u00e4 tutkielmassa tarkastellaan relativististen neutriinojen sekoittumista kuvaavan\nformalismin johtamista kvanttikentt\u00e4teoriaan pohjautuvista l\u00e4ht\u00f6kohdista. Tutkielmassa\nl\u00e4hdet\u00e4\u00e4n liikkeelle Schwinger-Keldysh yht\u00e4l\u00f6st\u00e4, josta johdetaan yleiset\nKadanoff-Baym (KB) yht\u00e4l\u00f6t Wigner-avaruudessa. KB-yht\u00e4l\u00f6t ratkaistaan k\u00e4ytt\u00e4en\nkoherenttia kvasihiukkasapproksimaatiota (cQPA). cQPA-mallista seuraa, ett\u00e4 systeemin\nfaasiavaruudessa esiintyy t\u00e4ysin uudenlaisia koherenssikuoria, jotka voidaan\ntunnistaa sis\u00e4lt\u00e4v\u00e4n informaatiota ei-lokaalista kvanttikoherenssista.\nTutkielmassa siis tarkastellaan kuinka neutriinoille voidaan johtaa liikeyht\u00e4l\u00f6t,\njotka huomioivat kvanttikoherenssin ilman lis\u00e4oletuksia. Johdettujen liikeyht\u00e4l\u00f6iden\navulla voidaan laskea koherenttien neutriinotilojen v\u00e4list\u00e4 sirontaa, johon t\u00e4m\u00e4nhetkiset\nmallit eiv\u00e4t kykene. Lis\u00e4ksi n\u00e4iden liikeyht\u00e4l\u00f6iden avulla voidaan johtaa neutriinojen\ntiheysmatriisiformalismi yleisemmist\u00e4 l\u00e4ht\u00f6kohdista kuin mit\u00e4 on aikaisemmin\ntehty.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "When neutrinos propagate in matter they encounter two kinds of interactions with\nthe medium: coherent and incoherent collisions. Due to the coherent collisions\na background potential arises which modifies the energy eigenstates of neutrinos.\nIncoherent collisions, however, lead to quantum damping which affects the dynamical\nevolution of neutrinos.\nIn this thesis it is studied how a formalism, which describes mixing of relativistic\nneutrino fields, can be derived from the grounds of thermal quantum field theory.\nWe begin by deriving the general Kadanoff-Baym (KB) equations in the Wigner\nspace starting from the contour Schwinger-Keldysh euqation. Next the KB equations\nare solved using the coherent quasiparticle approximation (cQPA). From the cQPA\nscheme it follows that the phase space of the system contains completely novel shell\nsolutions which can be recognized to carry information about non-local quantum\ncoherence.\nThus, in this thesis we focus on discussing how a closed set of equations of motion,\nwhich take into account quantum coherence without any additional approximations,\ncan be derived for propagating neutrinos. With these equations of motion it is\npossible to calculate scattering processes between coherent neutrino states to which\nno other existing model is capable of. In addition, they can be used to derive the\nneutrino density matrix formalism from more fundamental grounds than what has\nbeen done before.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2020-12-09T11:40:59Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2020-12-09T11:40:59Z (GMT). No. of bitstreams: 0\n Previous issue date: 2020", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "77", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "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": "neutrino physics", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "thermal field theory", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "kinetic transport theory", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "cQPA", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Neutrino density matrix formalism derived from Kadanoff-Baym equations", "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-202012097007", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "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": "kvanttikentt\u00e4teoria", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "neutriinot", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "hiukkasfysiikka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "quantum field theory", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "neutrinos", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "particle physics", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": 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