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SUMMARY:Measuring the dark universe - astrophysical contamination on all s
 cales - Andrew Pontzen (UCL)
DTSTART:20141124T130000Z
DTEND:20141124T140000Z
UID:TALK56307@talks.cam.ac.uk
CONTACT:33215
DESCRIPTION:In this talk I will introduce two separate strands of work.\n\
 nThe first looks at how violent astrophysical effects can change the distr
 ibution of dark matter in galaxies\, generating severe difficulties for ob
 servers who wish to constrain the nature of the underlying particle. I wil
 l suggest avenues of future work that may yet be able to untangle these co
 mplexities.\n\nThe second concerns dark energy constraints from the observ
 ed Lyman-alpha forest. The forest is generally assumed to be a tracer of t
 otal matter on large scales but I will show how the assumed link between t
 he dark and observable universe is substantially modified by radiative tra
 nsfer effects. This generates difficulties for futuristic dark energy surv
 eys like DESI\, but also prime opportunities to learn more about the sourc
 e of ionising photons in our universe.\n\nThrough both strands I will disc
 uss analytic\, computational and observational progress on the problems.\n
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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