Effective field theory approach to quasi-single field inflation and effects of heavy fields

By Toshifumi Noumi, Masahide Yamaguchi, D. Yokoyama. 2012

259 citations recorded by the source corpus.

A bstractWe apply the effective field theory approach to quasi-single field inflation, which contains an additional scalar field with Hubble scale mass other than inflaton. Based on the time-dependent spatial diffeomorphism, which is not broken by the time-dependent background evolution, the most generic action of quasi-single field inflation is constructed up to third order fluctuations. Using the obtained action, the effects of the additional massive scalar field on the primordial curvature perturbations are discussed. In particular, we calculate the power spectrum and discuss the momentum-dependence of three point functions in the squeezed limit for general settings of quasi-single field inflation. Our framework can be also applied to inflation models with heavy particles. We make a qualitative discussion on the effects of heavy particles during inflation and that of sudden turning trajectory in our framework.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/2c111e3c683da03ac54c735adb55178886679644

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Xingang Chen
2. E. Pajer
3. D. Baumann
4. A. Banday
5. H. Eriksen
6. F. Hansen
7. P. Lilje
8. M. Liguori

In Nuclear and High Energy Physics

1. Xingang Chen
2. E. Pajer
3. D. Baumann
4. Hayden Lee
5. G. L. Pimentel
6. C. Sleight
7. J. Fergusson
8. A. Banday

Citations in the corpus

• Planck 2018 results. IX. Constraints on primordial non-Gaussianity (2019, background): “Measuring primordial NG can allow us to pin down masses and spins of the particle content present during inflation, making inflation a powerful cosmological collider (Chen 2010b; Chen & Wang 2010; Noumi et al. 2013; Arkani-Hamed & Maldacena 2015; Baumann et al. 2018; Arkani-Hamed et al. 2018).”
• Planck 2015 results. XVII. Constraints on primordial non-Gaussianity (2015, unknown): “Measuring primordial NG can allow us to pin down masses and spins of the particle content present during inflation, making inflation a powerful cosmological collider (Chen 2010b; Chen & Wang 2010; Noumi et al. 2013; Arkani-Hamed & Maldacena 2015; Baumann et al. 2018; Arkani-Hamed et al. 2018).”
• Prospects for cosmological collider physics (2016, methodology): “A variety of other scattering processes can occur (see for example diagram C) and have been discussed in [2, 3, 6, 29].”
• Bootstrapping inflationary correlators in Mellin space (2019, methodology): “The phase of the oscillatory behaviour arises from the quantum interference between two processes [27, 29] (the expansion of the universe and particle creation), which turns out to be determined by the factor δ (u, ū) in the de Sitter exchange four-point function.”
• A Mellin space approach to cosmological correlators (2019, background): “This property was observed in [11] (see also [113]) in d = 3 for equal external conformally coupled or massless scalars.”
• Non-Gaussianity as a particle detector (2016, methodology): “This can be shown by an ADM analysis of the metric perturbations [11, 35].”
• Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation (2020, background): “[87, 88] in a multifield context), each type of perturbations can propagate with reduced sound speeds, and it would be interesting to generalise our findings to such setups.”