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CATEGORIES:Institute of Astronomy Seminars
SUMMARY:Baryonic Feedback: the Impact of Galaxy Formation 
 Physics on Cosmology - Leah Bigwood
DTSTART;TZID=Europe/London:20231122T131500
DTEND;TZID=Europe/London:20231122T134000
UID:TALK208786AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/208786
DESCRIPTION:Extracting accurate cosmology from weak lensing su
 rveys requires accurate modelling of the matter po
 wer spectrum\, including the non-linear scales whi
 ch are affected by baryonic processes. Hydrodynami
 cal simulations have demonstrated that energetic f
 eedback processes\, arising predominantly from AGN
 \, suppress the non-linear matter power spectrum. 
 However\, the amplitude\, redshift and scale depen
 dence of this suppression remains largely unknown.
   A more complete understanding of baryonic feedba
 ck processes and its degeneracies with cosmologica
 l parameters is therefore crucial to make progress
  in the field. In this talk\, I will describe my w
 ork which explores baryonic feedback from two view
 points. The first project tests modifications to t
 he AGN feedback model in the FABLE suite of cosmol
 ogical hydrodynamical simulations. I will discuss 
 extreme baryonic feedback as a possible solution t
 o the ‘S8 tension’ and present the development of 
 a new empirical AGN feedback model which predicts 
 an increased suppression of the matter power spect
 rum. The second project I will discuss assesses st
 andard and new methods of mitigating for baryonic 
 feedback in cosmic shear analyses using the Dark E
 nergy Survey Y3 cosmic shear dataset. I present a 
 comparison of the approaches by considering the im
 pact on the cosmological parameters and the constr
 aints on the power spectrum suppression. Finally\,
  I will demonstrate that the kinematic Sunyaev-Zel
 ’dovich (kSZ) effect provides a promising avenue f
 or understanding baryonic feedback in a new regime
  and can be effectively utilised in a joint shear+
 kSZ analysis to better constrain feedback paramete
 rs. 
LOCATION:The Hoyle Lecture Theatre + Zoom 
CONTACT:
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