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(30.01.) Amplitudes meet Cosmology

Paolo Benincasa (Bohr Inst. Copenhagen)

30.01.2020 at 16:30 

The principles of Lorentz invariance, locality and unitarity highly constrain the physics at accessible high energy: the type of interactions allowed as well as most of the theorems known in particle physics are instances of these principles. This is neatly seen in the structure of scattering amplitudes in asymptotically flat space-times. However, cosmology suggests that such principles may be just approximate: Lorentz invariance is broken at cosmological scales and the accelerated expansion of the universe seems to prevent a full-fledge definition of quantum mechanical observables. If our fundamental ideas in particle physics become somehow approximate in cosmology, what are the fundamental rules governing cosmological processes? In this talk I will report on a recent program which aims to address this question, by bringing both philosophy and methods which have been successful for scattering amplitudes to the analysis of cosmological observables. In particular we investigate the analytic properties of the wavefunction of the universe, how fundamental physics is encoded into it, how the flat-space physics reflects into it, and the relation to novel mathematical structures named cosmological polytopes.

Arnold Sommerfeld Center
Theresienstrasse 37
Room 348