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SUMMARY:Andrew Zentner:  Halo Clustering\, Galaxy Clustering\, and the The
 ory and Detection of Assembly Bias
DTSTART:20251104T121500Z
DTEND:20251104T130000Z
DTSTAMP:20260819T081300Z
UID:indico-event-9393@indico.fysik.su.se
CONTACT:alexander.burgman@fysik.su.se
DESCRIPTION:Dark matter halos provide the potential wells within which gal
 axy formation occurs. As such\, halos are the essential scaffolding of lar
 ge-scale structure which supports the visible facade of galaxies. Understa
 nding the clustering of halos is a first step toward understanding the clu
 stering of galaxies. It has long been known that the clustering of dark ma
 tter halos is a very strong function of halo mass. What has been appreciat
 ed for roughly 20 years now\, is that halos cluster differentially as a fu
 nction of their other properties as well. Assembly bias of halos is a jarg
 on term for the dependence of halo clustering on properties other than mas
 s. This is interesting for many reasons. If galaxies populate halos in a m
 anner that does not depend solely upon halo mass\, but on other halo prope
 rties as well\, then it will not be possible to model and interpret galaxy
  clustering at high precision with models of the galaxy—halo connection 
 that map galaxies onto halos in a manner that depends only on mass. This c
 an have many important consequences for the interpretation of galaxy surve
 ys and for cosmology. As a simple example\, it can add scatter and/or syst
 ematic errors into the inferred galaxy mass—halo mass relation. I will b
 riefly review assembly bias and describe two recent claims of the detectio
 n of halo bias in SDSS and DESI data by members of my group. Time permitti
 ng\, I would be happy to sketch other interesting work in my group includi
 ng gravitational production of dark matter\, using stars as probes of dark
  matter\, and answer questions!\nAbout the speaker:  Andrew Zentner (Univ
 ersity of Pittsburgh) is a theorists with a broad range of research intere
 st\, falling under cosmology and structure formation. These include galaxy
  formation\, the phenomenology and identification of the dark matter and d
 ark energy\, and astrophysical limits on fundamental physics. He maintains
  close collaborations with observational surveys to connect theoretical pr
 edictions and interpretation of data.\nIn the OKC:  A5:1049\, Tuesday Nov
  4th\n\nhttps://indico.fysik.su.se/event/9393/
LOCATION:FB42 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9393/
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