Publication
Fluctuation-dissipation dynamics of cosmological scalar fields
| Summary: | We show that dissipative effects have a significant impact on the evolution of cosmological scalar fields, leading to friction, entropy production and field fluctuations. We explicitly compute the dissipation coefficient for different scalar fields within the standard model and some of its most widely considered extensions, in different parametric regimes. We describe the generic consequences of fluctuation-dissipation dynamics in the postinflationary universe, focusing in particular on friction and particle production, and analyze in detail two important effects. First, we show that dissipative friction delays the process of spontaneous symmetry breaking and may even damp the motion of a Higgs field sufficiently to induce a late period of warm inflation. Along with dissipative entropy production, this may parametrically dilute the abundance of dangerous thermal relics. Second, we show that dissipation can generate the observed baryon asymmetry without symmetry restoration, and we develop in detail a model of dissipative leptogenesis. We further show that this generically leads to characteristic baryon isocurvature perturbations that can be tested with cosmic microwave background observations. This work provides a fundamental framework to go beyond the leading thermal equilibrium semiclassical approximation in addressing fundamental problems in modern cosmology. |
|---|---|
| Main Authors: | Bartrum, Sam |
| Other Authors: | Berera, Arjun; Rosa, João G. |
| Subject: | Cosmology Phase transitions Dissipation |
| Year: | 2015 |
| Country: | Portugal |
| Document type: | article |
| Access type: | open access |
| Associated institution: | Universidade de Aveiro |
| Language: | English |
| Origin: | RIA - Repositório Institucional da Universidade de Aveiro |
| _version_ | 1877768724767834112 |
|---|---|
| author | Bartrum, Sam |
| author2 | Berera, Arjun Rosa, João G. |
| author2_role | author author |
| author_facet | Bartrum, Sam Berera, Arjun Rosa, João G. |
| author_role | author |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Bartrum, Sam\"},{\"Person.name\":\"Berera, Arjun\"},{\"Person.name\":\"Rosa, João G.\"}] |
| datacite.creators.creator.creatorName.fl_str_mv | Bartrum, Sam Berera, Arjun Rosa, João G. |
| datacite.date.Accepted.fl_str_mv | 2015-04-29T00:00:00Z |
| datacite.date.available.fl_str_mv | 2016-01-06T17:25:09Z |
| datacite.date.embargoed.fl_str_mv | 2016-01-06T17:25:09Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Cosmology Phase transitions Dissipation |
| datacite.titles.title.fl_str_mv | Fluctuation-dissipation dynamics of cosmological scalar fields |
| dc.creator.none.fl_str_mv | Bartrum, Sam Berera, Arjun Rosa, João G. |
| dc.date.Accepted.fl_str_mv | 2015-04-29T00:00:00Z |
| dc.date.available.fl_str_mv | 2016-01-06T17:25:09Z |
| dc.date.embargoed.fl_str_mv | 2016-01-06T17:25:09Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10773/14997 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | American Physical Society |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | Cosmology Phase transitions Dissipation |
| dc.title.fl_str_mv | Fluctuation-dissipation dynamics of cosmological scalar fields |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | We show that dissipative effects have a significant impact on the evolution of cosmological scalar fields, leading to friction, entropy production and field fluctuations. We explicitly compute the dissipation coefficient for different scalar fields within the standard model and some of its most widely considered extensions, in different parametric regimes. We describe the generic consequences of fluctuation-dissipation dynamics in the postinflationary universe, focusing in particular on friction and particle production, and analyze in detail two important effects. First, we show that dissipative friction delays the process of spontaneous symmetry breaking and may even damp the motion of a Higgs field sufficiently to induce a late period of warm inflation. Along with dissipative entropy production, this may parametrically dilute the abundance of dangerous thermal relics. Second, we show that dissipation can generate the observed baryon asymmetry without symmetry restoration, and we develop in detail a model of dissipative leptogenesis. We further show that this generically leads to characteristic baryon isocurvature perturbations that can be tested with cosmic microwave background observations. This work provides a fundamental framework to go beyond the leading thermal equilibrium semiclassical approximation in addressing fundamental problems in modern cosmology. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ria_22a04fb05124d6eede83a3f46b318182 |
| identifier.url.fl_str_mv | http://hdl.handle.net/10773/14997 |
| inst_facet_str | urn:organizationAcronym:ua{{{_:::_}}}Universidade de Aveiro |
| instacron_str | ua |
| institution | Universidade de Aveiro |
| instname_str | Universidade de Aveiro |
| language | eng |
| network_acronym_str | ria |
| network_name_str | RIA - Repositório Institucional da Universidade de Aveiro |
| oai_identifier_str | oai:ria.ua.pt:10773/14997 |
| organization_str_mv | urn:organizationAcronym:ua |
| person_str_mv | Bartrum, Sam Berera, Arjun Rosa, João G. |
| publishDate | 2015 |
| publisher.none.fl_str_mv | American Physical Society |
| repo_facet_str | urn:repositoryAcronym:ria{{{_:::_}}}RIA - Repositório Institucional da Universidade de Aveiro |
| reponame_str | RIA - Repositório Institucional da Universidade de Aveiro |
| repository_id_str | urn:repositoryAcronym:ria |
| service_str_mv | urn:repositoryAcronym:ria |
| spelling | porWe show that dissipative effects have a significant impact on the evolution of cosmological scalar fields, leading to friction, entropy production and field fluctuations. We explicitly compute the dissipation coefficient for different scalar fields within the standard model and some of its most widely considered extensions, in different parametric regimes. We describe the generic consequences of fluctuation-dissipation dynamics in the postinflationary universe, focusing in particular on friction and particle production, and analyze in detail two important effects. First, we show that dissipative friction delays the process of spontaneous symmetry breaking and may even damp the motion of a Higgs field sufficiently to induce a late period of warm inflation. Along with dissipative entropy production, this may parametrically dilute the abundance of dangerous thermal relics. Second, we show that dissipation can generate the observed baryon asymmetry without symmetry restoration, and we develop in detail a model of dissipative leptogenesis. We further show that this generically leads to characteristic baryon isocurvature perturbations that can be tested with cosmic microwave background observations. This work provides a fundamental framework to go beyond the leading thermal equilibrium semiclassical approximation in addressing fundamental problems in modern cosmology.application/pdfengAmerican Physical SocietyporFluctuation-dissipation dynamics of cosmological scalar fieldsBartrum, SamBerera, ArjunRosa, João G.Handlehttp://hdl.handle.net/10773/14997ISSNIsPartOf1550-7998DOIIsPartOf10.1103/PhysRevD.91.0835402016-01-06T17:25:09Z2015-04-29T00:00:00Z2015-04-29http://purl.org/coar/access_right/c_abf2open accessporCosmologyporPhase transitionsporDissipation1250610 byteshttp://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://ria.ua.pt/bitstream/10773/14997/1/1412.5489v2.pdfliteraturehttp://purl.org/coar/resource_type/c_6501journal article |
| spellingShingle | Fluctuation-dissipation dynamics of cosmological scalar fields Bartrum, Sam Cosmology Phase transitions Dissipation |
| status | SINGLETON |
| subject.fl_str_mv | Cosmology Phase transitions Dissipation |
| title | Fluctuation-dissipation dynamics of cosmological scalar fields |
| title_full | Fluctuation-dissipation dynamics of cosmological scalar fields |
| title_fullStr | Fluctuation-dissipation dynamics of cosmological scalar fields |
| title_full_unstemmed | Fluctuation-dissipation dynamics of cosmological scalar fields |
| title_short | Fluctuation-dissipation dynamics of cosmological scalar fields |
| title_sort | Fluctuation-dissipation dynamics of cosmological scalar fields |
| topic | Cosmology Phase transitions Dissipation |
| topic_facet | Cosmology Phase transitions Dissipation |
| url | http://hdl.handle.net/10773/14997 |
| visible | 1 |
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