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SUMMARY:Tracing Matter and Gas using CMB as a backlight
DTSTART:20260602T093000Z
DTEND:20260602T110000Z
DTSTAMP:20260816T150000Z
UID:indico-event-5595@agenda.ciemat.es
DESCRIPTION:Speakers: Frank Qu Zhu (KIPAC\, Stanford University)\n\nThe co
 smic microwave background serves as a unique backlight for mapping both th
 e matter distribution and the ionized gas across cosmic time. CMB lensing 
 traces the integrated matter field out to high redshift\, while the kinema
 tic Sunyaev-Zel'dovich (kSZ) effect isolates the free electron distributio
 n in and around galaxy halos. Together these probes address questions at t
 he intersection of precision cosmology and galaxy formation: the S₈ tens
 ion and the puzzlingly tight upper limits on the neutrino mass sum from re
 cent data combinations\, and the poorly constrained baryon distribution wi
 thin halos that increasingly limits upcoming surveys. In the first part of
  the talk\, I will discuss how CMB lensing has become one of our most robu
 st probes of cosmology\, focusing on the joint ACT\, SPT\, and Planck anal
 ysis that delivered one of the most precise measurements of structure grow
 th to date. I will preview preliminary results from an updated analysis of
  ACT's final data release (DR6+) and outline the decisive role Simons Obse
 rvatory will play in probing new physics. In the second part\, I will pres
 ent the highest signal-to-noise kSZ measurements to date\, obtained by cro
 ss-correlating DESI DR2 luminous red galaxies\, bright galaxies (BGS)\, an
 d emission line galaxies (ELGs) with ACT DR6 temperature maps\, together t
 he most significant kSZ detections from any spectroscopic survey. Alongsid
 e configuration-space analyses based on compensated aperture photometry\, 
 I will describe one of the first comprehensive harmonic-space measurements
 \, constructed from kSZ momentum templates cross-correlated with the CMB\,
  and discuss the implications for the gas distribution in halos and for ba
 ryonic feedback.\n\nhttps://agenda.ciemat.es/event/5595/
LOCATION:María de Maeztu (Sala)
URL:https://agenda.ciemat.es/event/5595/
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