Distinctive signatures of space-time diffeomorphism breaking in EFT of inflation
- Dipartimento di Fisica e Astronomia 'G. Galilei', Università degli Studi di Padova, via Marzolo 8, I-35131, Padova (Italy)
- Faculty of Science and Technology, University of Stavanger, 4036 Stavanger (Norway)
- Department of Physics, Swansea University, Swansea, SA2 8PP (United Kingdom)
The effective field theory of inflation is a powerful tool for obtaining model independent predictions common to large classes of inflationary models. It requires only information about the symmetries broken during the inflationary era, and on the number and nature of fields that drive inflation. In this paper, we consider the case for scenarios that simultaneously break time reparameterization and spatial diffeomorphisms during inflation. We examine how to analyse such systems using an effective field theory approach, and we discuss several observational consequences for the statistics of scalar and tensor modes. For example, examining the three point functions, we show that this symmetry breaking pattern can lead to an enhanced amplitude for the squeezed bispectra, and to a distinctive angular dependence between their three wavevectors. We also discuss how our results indicate prospects for constraining the level of spatial diffeomorphism breaking during inflation.
- OSTI ID:
- 22524924
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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Breaking discrete symmetries in the effective field theory of inflation
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