Sean Carroll
@seancarroll·255K subscribers·596 videos
Colloquium October 24th, 2013 -- Effective Field Theory and Cosmological Large-Scale Structure
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October 25, 2013
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1:08:39Now PlayingSean Carroll
Caltech
Effective Field Theory and Cosmological Large-Scale Structure
The rapid improvement in observations of large-scale structure in the universe has necessitated the development of more sophisticated theoretical tools for describing it. One such tool is effective field theory (EFT): the technique of subsuming physics on small scales into a small number of parameters in an effective large-scale theory. Recent work has developed cosmological perturbation theory in an EFT framework, with promising results. I will review this program, and also present new results showing why large-scale structure is not actually described by a conventional EFT, but requires (at least) interactions that are non-local in time.
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