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SUMMARY:Probing the nature of dark matter and modified gravity with massiv
 e galaxy clusters
DTSTART:20231124T120000Z
DTEND:20231124T140000Z
DTSTAMP:20260828T040400Z
UID:indico-event-435@indico.hiskp.uni-bonn.de
DESCRIPTION:Speakers: Dominique Eckert (MPE\, Garching)\n\nIn spite of its
  numerous successes\, the LambdaCDM model of cosmology is fundamentally in
 complete\, in the sense that 95% of the postulated matter-energy content i
 s in an unknown form. Specifically\, the LambdaCDM model postulates the ex
 istence of an unknown matter component\, dubbed dark matter\, which outwei
 ghs all the normal matter content of galaxies by a factor of 5-6. The grav
 itational effects of dark matter can be studied exquisitely well by observ
 ing the dynamics of the most massive structures in today’s Universe - ga
 laxy clusters. In this respect\, deep X-ray observations of nearby galaxy 
 clusters play a key role in our understanding of the gravitational field o
 f collapsed halos. Indeed\, galaxy clusters are filled with a hot\, tenuou
 s plasma - the intracluster medium (ICM) - which contains the vast majorit
 y of their baryons and shines predominantly in X-rays. The pressure exerte
 d by the hot gas equilibrates the gravitational force\, such that the tota
 l enclosed mass can be derived point-by-point from the thermodynamic prope
 rties of the ICM. I will present recent studies aiming at determining the 
 gravitational field of galaxy clusters from the thermodynamic properties o
 f 12 massive\, nearby systems. I will show how such observations can be us
 ed to constrain the self-interaction cross section of dark matter and how 
 the measured gravitational field sets constraints on modified gravity theo
 ries. Finally\, I will present a new approach combining galaxy cluster obs
 ervables (X-ray\, weak gravitational lensing\, Sunyaev-Zeldovich effect) t
 o reconstruct the underlying gravitational field\, minimizing the systemat
 ic uncertainties associated with each individual method.\n\nhttps://indico
 .hiskp.uni-bonn.de/event/435/
LOCATION:Nußallee 12/2.006 (PI) - Lecture Hall I (PI)
URL:https://indico.hiskp.uni-bonn.de/event/435/
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