{"id":7935,"date":"2024-07-02T18:47:29","date_gmt":"2024-07-02T13:17:29","guid":{"rendered":"https:\/\/www.isical.ac.in\/~pamu\/?post_type=event&#038;p=7935"},"modified":"2024-07-26T16:39:54","modified_gmt":"2024-07-26T11:09:54","slug":"self-interactions-of-uldm-to-the-rescue","status":"publish","type":"event","link":"https:\/\/oldweb.isical.ac.in\/~pamu\/event\/self-interactions-of-uldm-to-the-rescue\/","title":{"rendered":"Self-interactions of ULDM to the rescue?"},"content":{"rendered":"<p class=\"cvGsUA direction-ltr align-justify para-style-body\"><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">The fundamental physical properties of Dark Matter (DM) e.g. particle mass, spin, couplings, etc. still remain a mystery. If DM particles are spinless and ultra-light<\/span> (<em>m~10<sup>-22 <\/sup>eV<\/em>)<span class=\"OYPEnA text-decoration-none text-strikethrough-none\">, what are the observational constraints on its properties like mass and in particular, self-couplings? In this talk we attempt to answer this question by considering the following scenarios: (a) Using observational upper limits on the amount of mass contained within some region around the galactic centre, one can impose constraints in the<\/span> <em>\u03bb-m<\/em> <span class=\"OYPEnA text-decoration-none text-strikethrough-none\">plane, where allowed self-couplings can be as small as<\/span> <em>\u03bb~\u00b110<sup>-96<\/sup><\/em><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">, <\/span><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">(b) requiring that observed galactic rotation curves of dwarf galaxies as well as an empirical soliton-halo relation have to be simultaneously satisfied allows one to probe self-couplings as small as<\/span> <em>\u03bb~\ud835\udcaa(10<sup>-90<\/sup>)<\/em><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">, and <\/span><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">(c) survival of dwarf satellite galaxies orbiting in the potential of larger halos on cosmological timescales can be used to probe both attractive and<\/span> <span class=\"OYPEnA text-decoration-none text-strikethrough-none\">repulsive<\/span> <span class=\"OYPEnA text-decoration-none text-strikethrough-none\">self-couplings<\/span> <span class=\"OYPEnA text-decoration-none text-strikethrough-none\">as<\/span> <span class=\"OYPEnA text-decoration-none text-strikethrough-none\">small<\/span> <span class=\"OYPEnA text-decoration-none text-strikethrough-none\">as\u00a0<em>\u03bb~\u00b110<sup>-92<\/sup><\/em><\/span><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">. <\/span><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">Towards the end of the talk, we shall also discuss how machine learning models like neural networks could be used to learn DM parameters (in particular ULDM mass <\/span><em><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">m<\/span><\/em><span class=\"OYPEnA text-decoration-none text-strikethrough-none\">) from galactic rotation curves.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The fundamental physical properties of Dark Matter (DM) e.g. particle mass, spin, couplings, etc. still remain a mystery. If DM particles are spinless and ultra-light (<em>m~10<sup>-22 <\/sup>eV<\/em>), what are the observational constraints on its properties like mass and in particular, self-couplings? In this talk&#8230;<\/p>\n","protected":false},"featured_media":7936,"template":"","categories":[107],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/event\/7935"}],"collection":[{"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/event"}],"about":[{"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/types\/event"}],"version-history":[{"count":1,"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/event\/7935\/revisions"}],"predecessor-version":[{"id":8006,"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/event\/7935\/revisions\/8006"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/media\/7936"}],"wp:attachment":[{"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/media?parent=7935"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/categories?post=7935"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oldweb.isical.ac.in\/~pamu\/wp-json\/wp\/v2\/tags?post=7935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}