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SUMMARY:Effective Field Theory in Cosmology - Leonardo Senatore (Stanford)
DTSTART:20140212T141500Z
DTEND:20140212T151500Z
UID:TALK49764@talks.cam.ac.uk
CONTACT:Dr Joan Camps
DESCRIPTION:The recent tremendous progress in Observational Cosmology make
 s it now sensitive to non-linear corrections in the evolution of the densi
 ty perturbations during the early epochs of the universe. In this context\
 , the effective field theory paradigm represents the ideal setup to explor
 e and systematically study the signatures that come from interactions\, an
 d additionally to directly map what we are learning from data into theory.
  I will describe two recent applications of this paradigm to Cosmology: th
 e Effective Field Theory of Inflation and the Effective Field Theory of Co
 smological Large Scale Structures (EFTofLSS). The first example represents
  the general parametrization of adiabatic fluctuations around an inflation
 ary solutions\, and it allows us to study the non-Gaussian signatures of I
 nflation\, that I will describe. The second example is in the context of t
 he gravitational clustering of dark matter. In our universe matter perturb
 ations are large on short distances and small on large distances: strongly
  coupled in the UV and weakly coupled in the IR. We formulate an effective
  description based on an IR fluid-like system that allows us to formulate 
 a manifestly convergent perturbative expansion to describe weak dark matte
 r clustering. I will present the predictions of the EFTofLSS up to 2-loops
 . We find that it matches to percent accuracy the non-linear matter power 
 spectrum up to k\\sim 0.6 h/Mpc\, requiring just one unknown coupling cons
 tant that needs to be fit to observations. Given that former perturbative 
 techniques stop converging at k\\sim 0.1 h/Mpc\, our results demonstrate t
 he possibility of accessing a factor of order 200 more dark matter quasi-l
 inear modes than naively expected. If the remaining observational challeng
 es to accessing these modes can be addressed with similar success\, our re
 sults show that there is tremendous potential for large scale structure su
 rveys to explore the primordial universe.
LOCATION:MR2\, Centre for Mathematical Sciences
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