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SUMMARY: Intrinsic alignments in the Stage IV era - Elisa Chisari and Thom
 as Bakx (Utrecht)
DTSTART:20231016T120000Z
DTEND:20231016T130000Z
UID:TALK204940@talks.cam.ac.uk
CONTACT:Inigo Zubeldia
DESCRIPTION:Galaxies align towards each other in a way that is correlated 
 with the large-scale structure of the Universe. These intrinsic alignments
  are a known contaminant to weak gravitational lensing and clustering cosm
 ology. In the first half of the talk\, we will give an overview of intrins
 ic alignments. We will discuss what we know about them from an observation
 al perspective and how they contaminate weak lensing and clustering measur
 ements. We will also point out some of their cosmological applications. In
  the second half\, we will present some perturbative models that have been
  employed in the literature to describe intrinsic alignments\, along with 
 some recent developments in this direction. In particular\, the recently d
 eveloped Effective Field Theory of Intrinsic Alignments generalises other 
 perturbative models and is able to describe B-modes of halo intrinsic alig
 nments with high precision on quasi-linear scales. We also briefly discuss
  a hybrid Lagrangian approach which blends simulation-based methods and pe
 rturbation theory in order to improve the model fit on even smaller scales
 \, which is particularly relevant for weak lensing mitigation. 
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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