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Domů » Oddělení teorie a fenomenologie částic

Tensor bounds on the hidden universe

Seminář
Pondělí, 05.11.2018 14:00

Přednášející: Subodh Patil (Niels Bohr Institute, Copenhagen, Denmark)
Místo: Seminární místnost č. 226, FZÚ AV ČR, Pod Vodárenskou věží 1, Praha 8
Jazyk: Angličtina
Pořadatelé: Oddělení teorie a fenomenologie částic
In this talk, we present an amusing observation that primordial gravitational waves, if ever observed, can be used to bound the hidden field content of the universe. This is because a large number of hidden fields can resum to potentially observable logarithmic runnings for the graviton two-point function in the context of single field inflation, courtesy of a `large N' expansion. This allows one to translate ever more precise bounds on the tensor to scalar consistency relation into bounds on the hidden field content of the universe, with potential implications for phenomenological constructions that address naturalness with a large number of species. Along the way, we'll review how the cutoff for an EFT that includes gravity changes as we incorporate matter, identifying two distinct scales for gravity. We'll also need to address certain subtleties regarding loop corrections on cosmological backgrounds, especially with regards to the correct implementation of dimensional regularization.