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Effective Field Theory and Modified Gravity Models in Cosmology

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Eanna Flanagan, Cornell University
When
20 September 2013 from 11:00 AM to 12:15 PM
Where
320 Whitmore Lab
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The use of effective field theory methods in classifying models of modified gravity in the context of cosmology.  I compare two different methods that have been used in this context, the covariant approach pioneered by Weinberg and the approach of specializing to perturbations about a cosmological background invented by Cheung, Creminelli et al. The two methods are complimentary, both have advantages and disadvantages. I argue that effective field theory methods are less all-encompassing in the cosmological context than they are in particle physics.

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