Friday, September 2, 2016
Can we do accurate cosmology with galaxies?
Jonathan Blazek, Postdoctoral Fellow, Center for Cosmology and AstroParticle Physics, OSU
Upcoming projects such as DESI, LSST, Euclid, and WFIRST will measure positions and shapes for hundreds of millions of galaxies, enabling weak lensing and clustering analyses at an unprecedented level of precision to probe fundamental physics. However, in this new regime, several astrophysical effects must be understood to ensure that we draw accurate conclusions. I will discuss two such effects that can impact observed correlations on cosmological scales: intrinsic alignments (the shapes and orientations of galaxies) and galaxy biasing from streaming baryon velocities. Although seemingly distinct topics, a similar framework can be used to study both. Moreover, self-consistent modeling of several astrophysical effects is needed as we increasingly combine multiple cosmological probes. Beyond their impact on accurate cosmology, these effects provide new windows into both fundamental physics and complex astrophysical processes.