{"id":6441,"date":"2026-10-19T09:48:54","date_gmt":"2026-10-19T09:48:54","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-edlisfraedi-tamar-meshveliani\/"},"modified":"2026-10-19T09:48:54","modified_gmt":"2026-10-19T09:48:54","slug":"doktorsvorn-i-edlisfraedi-tamar-meshveliani","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-edlisfraedi-tamar-meshveliani\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed e\u00f0lisfr\u00e6\u00f0i – Tamar Meshveliani"},"content":{"rendered":"
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Doktorsefni:<\/strong>\u00a0 Tamar Meshveliani<\/p>\n

Heiti ritger\u00f0ar:<\/strong>\u00a0Eiginv\u00edxlverkandi hulduefni, heitt hulduefni og \u00e1hrif \u00feeirra \u00ed dvergvetrarbrautum (The impact of Self-Interacting Dark Matter and Warm Dark Matter in dwarf galaxies)<\/p>\n

Andm\u00e6lendur:<\/strong>
<\/strong>Dr. Azadeh Fattahi Savadjani, d\u00f3sent vi\u00f0 Durham University, Bretlandi
Dr. \u00a0Camila Correa, ranns\u00f3knarma\u00f0ur hj\u00e1 CEA, Paris-Saclay, Frakklandi<\/p>\n

Lei\u00f0beinandi:<\/strong>\u00a0 Dr. Jes\u00fas Zavala Franco, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00cd<\/p>\n

Einnig \u00ed doktorsnefnd:<\/strong>
<\/strong>Dr. Gunnlaugur Bj\u00f6rnsson, v\u00edsindama\u00f0ur vi\u00f0 Raunv\u00edsindastofnun H\u00e1sk\u00f3lans
Dr. David James Edward Marsh, Ernest Rutherford Fellow og Proleptic Lecturer, King’s College, Bretlandi<\/p>\n

Stj\u00f3rnandi varnar:<\/strong> Dr. Einar \u00d6rn Sveinbj\u00f6rnsson, pr\u00f3fessor og deildarforseti Raunv\u00edsindadeildar H\u00cd<\/p>\n

\u00c1grip<\/strong>
<\/strong>\u00cd heimsfr\u00e6\u00f0i er svonefnt \u039bCDM-l\u00edkan hin vi\u00f0tekna l\u00fdsing \u00e1 myndun og \u00fer\u00f3un st\u00e6rri efniseininga \u00ed alheimi. \u00dea\u00f0 samanstendur a\u00f0 megninu til af k\u00f6ldu hulduefni (CDM), sem er \u00f3skammta\u00f0, h\u00e6gfara og \u00e1rekstralaust. Vi\u00f0 myndun st\u00e6rri kerfa, safnast hulduefni\u00f0 undan eigin \u00feyngdarverkun, \u00ed v\u00ed\u00f0fema en \u00fe\u00e9tta hj\u00fapa. Hulduefnishj\u00faparnir hafa styrkjandi \u00e1hrif \u00e1 st\u00f6\u00f0ugleika vetrarbrauta, en aukinn \u00fat\u00feennsluhra\u00f0i alheims \u00e1 s\u00ed\u00f0ari stigum stafar af heimsfasta, \u039b. Hermanir\u039bCDM-l\u00edkana hafa oft ekki samr\u00e6mst ni\u00f0urst\u00f6\u00f0um m\u00e6linga \u00e1 vetrarbrautum og grunneiningum \u00feeirra, s\u00e9r \u00ed lagi hafa hef\u00f0bundnar hulduagnir ekki fundist. \u00dear me\u00f0 hefur svigr\u00fam aukist til a\u00f0 kanna a\u00f0ra m\u00f6guleika og \u00e1 \u00feann h\u00e1tt hefur spurningin um ger\u00f0 og eiginleika huldusefnis or\u00f0i\u00f0 ein af meginr\u00e1\u00f0g\u00e1tum e\u00f0lisfr\u00e6\u00f0innar. \u00deessi ritger\u00f0 tekur \u00feessa spurningu til umfj\u00f6llunar og sko\u00f0ar samhengi\u00f0 \u00e1 milli tveggja tilg\u00e1ta um breytta heimsmynd hulduefnis: Annars vegar eiginv\u00edxlverkandi hulduefni (e. Self-Interacting Dark Matter – SIDM) og svo heitt hulduefni (Warm Dark Matter – WDM). \u00cd fyrra tilvikinu breytir sterk eiginv\u00edxlverkun hreyfifr\u00e6\u00f0i hulduefnishj\u00fapanna, en hi\u00f0 s\u00ed\u00f0ara veldur \u00fev\u00ed a\u00f0 varmafr\u00e6\u00f0ilegur hra\u00f0i \u00ed ungum alheimi dregur \u00far fj\u00f6lda og innri \u00fe\u00e9ttleika hj\u00fapa me\u00f0 l\u00edtinn massa. \u00deessi tilvik hafa veri\u00f0 innleidd til a\u00f0 leysa \u00f3samkv\u00e6mni \u00e1 milli hulduefnis og m\u00e6linga \u00e1 dvergvetrarbrautum. \u00cd WDM-hlutanum byggjum vi\u00f0 \u00e1 hermireikningum \u00ed h\u00e1rri upplausn, sem innihalda EAGLE l\u00edkani\u00f0 af myndun vetrarbrauta til a\u00f0 varpa lj\u00f3si \u00e1 hvernig t\u00f6lfr\u00e6\u00f0ilegir eiginleikar safns dvergvetrarbrauta tengjast n\u00e1nasta (~Mpc) umhverfi \u00ed Grenndarh\u00f3pnum. Vi\u00f0 beinum sj\u00f3num a\u00f0 heimsfr\u00e6\u00f0ilegum sv\u00e6\u00f0um me\u00f0 undir\u00fe\u00e9ttleika sem l\u00edtt hafa veri\u00f0 k\u00f6nnu\u00f0 me\u00f0 tilliti til forsp\u00e1a CDM og WDM. \u00cd lj\u00f3s kemur a\u00f0 dreifingarfall massa stjarna \u00ed vetrarbrautum er \u00ed \u00feessum tveimur tilfellum eins ef massinn er h\u00e1r (M_* > 10^7 Msun), en fyrir l\u00e6gri massa sp\u00e1ir WDM f\u00e6rri dvergvetrarbrautum en CDM. \u00cd SIDM-hlutanum n\u00fdtum vi\u00f0 aflfr\u00e6\u00f0ilega framsetningu sem er kv\u00f6r\u00f0u\u00f0 vi\u00f0 hermireikninga til a\u00f0 kanna lokaskei\u00f0 \u00ed \u00fer\u00f3un SIDM hj\u00fapa, skei\u00f0 \u00feyngdarvermins hruns. Vi\u00f0 s\u00fdnum a\u00f0 \u00e1 vissu sv\u00e6\u00f0i \u00ed stikar\u00fami SIDM-l\u00edkananna, hafa dvergvetrarbrautir tv\u00edtindadreifingu \u00fear sem sumar hafa \u00fe\u00e9ttann kjarna \u00e1 me\u00f0an a\u00f0rar eru yddar. \u00deeir hj\u00fapar sem hafa \u00feegar falli\u00f0 saman innihalda mi\u00f0lungsst\u00f3r svarthol. \u00deessar ni\u00f0urst\u00f6\u00f0ur var\u00f0a lei\u00f0 a\u00f0 lausn svonefnds margbreytileika \u00ed fylgi\u00feokum vetrarbrautarinnar. Loks \u00fatv\u00edkkum vi\u00f0 greiningu \u00e1 skei\u00f0i kjarna-hruns \u00ed SIDM-l\u00edk\u00f6num, me\u00f0 \u00fev\u00ed a\u00f0 taka einnig tillit til \u00e1hrifa \u00feungeinda \u00ed hj\u00fapnum. S\u00e9r \u00ed lagi hugum vi\u00f0 a\u00f0 \u00fev\u00ed hvernig n\u00fdta m\u00e1 \u00f3vermni\u00f3breytur til a\u00f0 sp\u00e1 fyrir um sv\u00f6run og breytingu \u00e1 brautum stjarna \u00feegar SIDM-kjarninn fellur saman.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Tamar Meshveliani f\u00e6ddist \u00e1ri\u00f0 1993. H\u00fan lauk BA gr\u00e1\u00f0u \u00ed e\u00f0lisfr\u00e6\u00f0i vi\u00f0 Frj\u00e1lsa h\u00e1sk\u00f3lann \u00ed Tbilisi \u00e1ri\u00f0 2015. Tamar lauk sameiginlegri meistaragr\u00e1\u00f0u \u00ed stj\u00f6rnufr\u00e6\u00f0i og stjarne\u00f0lisfr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3lann \u00ed Innsbruck, H\u00e1sk\u00f3lann \u00ed R\u00f3m -Tor Vergata og H\u00e1sk\u00f3lann \u00ed G\u00f6ttingen \u00e1ri\u00f0 2018.
H\u00fan h\u00f3f doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2020.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5829,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2024-06-28T09:00:00+00:00","_phd_date_end":"2024-06-28T12:00:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0arsalur","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Eiginv\u00edxlverkandi hulduefni, heitt hulduefni og \u00e1hrif \u00feeirra \u00ed dvergvetrarbrautum (The impact of Self-Interacting Dark Matter and Warm Dark Matter in dwarf galaxies)","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_edlisfraedi_tamar_meshveliani","_phd_source_node_id":"433693","_phd_source_type":"vidburdir","_phd_member_id":982,"footnotes":""},"phd_school":[101,93],"phd_discipline":[105],"class_list":["post-6441","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-raunvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-edlisfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6441\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/5829"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6441"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6441"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}