BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//6.4.7.2//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:0-1012@lptms.universite-paris-saclay.fr DTSTART;TZID=Europe/Paris:20250206T110000 DTEND;TZID=Europe/Paris:20250206T120000 DTSTAMP:20250128T134405Z URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-excepti onnel-du-lptms-nina-javerzat-liphy-grenoble/ SUMMARY:Séminaire exceptionnel du LPTMS: Nina Javerzat (LiPhy Grenoble) - Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 6 F év 25 11:00 DESCRIPTION:Rényi complexity in mean-field disordered systems\nNina Javerz at (LiPhy Grenoble)\n \;\n\nConfigurational entropy\, or complexity\,  quantifies the number of metastable states within (free) energy landsca pes\, and plays therefore a critical role in characterizing disordered s ystems such as glasses. Yet\, its measurement often requires significant c omputational resources. Recently\, Rényi entropy\, a one-parameter gener alization of the Shannon entropy\, has gained  attention across various fields of physics due to its simpler functional form\, making it more pra ctical for measurements. I will explain that the Rényi complexity corres ponds\, in disordered models\, to the difference of the free energy of a c loned system and the original one (a generalized Franz-Parisi potential). I will give a pedagogical overview of the case of the mean-field p-spin sp herical model\, where the computation of Rényi complexities can be perfor med analytically via the replica trick. Our results show that for models having one-step replica symmetry breaking (RSB)\, the Rényi complexities vanish at the Kauzmann temperature Tk\, suggesting that they are a usef ul observable for estimating Tk in practical applications. Moreover\, we s how that RSB solutions are required even in the liquid phase\, where inte resting relationships are found between Rényi complexities and the anneal ed Franz-Parisi potential.\n\nBased on arXiv:2411.19817 CATEGORIES:seminars LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53 0\, rue André Riviere\, Orsay\, 91405\, France X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\ , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530:geo:0,0 END:VEVENT BEGIN:VTIMEZONE TZID:Europe/Paris X-LIC-LOCATION:Europe/Paris BEGIN:STANDARD DTSTART:20241027T020000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET END:STANDARD END:VTIMEZONE END:VCALENDAR