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SUMMARY:Baryonic Feedback: the Impact of Galaxy Formation Physics on Cosmo
 logy - Leah Bigwood
DTSTART:20231122T131500Z
DTEND:20231122T134000Z
UID:TALK208786@talks.cam.ac.uk
CONTACT:107642
DESCRIPTION:Extracting accurate cosmology from weak lensing surveys requir
 es accurate modelling of the matter power spectrum\, including the non-lin
 ear scales which are affected by baryonic processes. Hydrodynamical simula
 tions have demonstrated that energetic feedback processes\, arising predom
 inantly from AGN\, suppress the non-linear matter power spectrum. However\
 , the amplitude\, redshift and scale dependence of this suppression remain
 s largely unknown.  A more complete understanding of baryonic feedback pro
 cesses and its degeneracies with cosmological parameters is therefore cruc
 ial to make progress in the field. In this talk\, I will describe my work 
 which explores baryonic feedback from two viewpoints. The first project te
 sts modifications to the AGN feedback model in the FABLE suite of cosmolog
 ical hydrodynamical simulations. I will discuss extreme baryonic feedback 
 as a possible solution to the ‘S8 tension’ and present the development
  of a new empirical AGN feedback model which predicts an increased suppres
 sion of the matter power spectrum. The second project I will discuss asses
 ses standard and new methods of mitigating for baryonic feedback in cosmic
  shear analyses using the Dark Energy Survey Y3 cosmic shear dataset. I pr
 esent a comparison of the approaches by considering the impact on the cosm
 ological parameters and the constraints on the power spectrum suppression.
  Finally\, I will demonstrate that the kinematic Sunyaev-Zel’dovich (kSZ
 ) effect provides a promising avenue for understanding baryonic feedback i
 n a new regime and can be effectively utilised in a joint shear+kSZ analys
 is to better constrain feedback parameters. 
LOCATION:The Hoyle Lecture Theatre + Zoom 
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