Parity-odd and even trispectrum from axion inflation Article Swipe

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Xuce Niu , Moinul Hossain Rahat , K.N. Srinivasan , Wei Xue ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.1088/1475-7516/2023/05/018

The four-point correlation function of primordial scalar perturbations has parity-even and parity-odd contributions and the parity-odd signal in cosmological observations is opening a novel window to look for new physics in the inflationary epoch. We study the distinct parity-odd and even prediction from the axion inflation model, in which the inflaton couples to a vector field via a Chern-Simons interaction, and the vector field is considered to be either approximately massless ( m A ≪ Hubble scale H ) or very massive ( m A ∼ H ). The parity-odd signal arises due to one transverse mode of the vector field being predominantly produced during inflation. We adopt the in-in formalism to evaluate the correlation functions. Considering the vector field mode function to be dominated by its real part up to a constant phase, we simplify the formulas for numerical computations. The numerical studies show that the massive and massless vector fields give significant parity-even signals, while the parity-odd contribution is about one to two orders of magnitude smaller.

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Expansion Of The Universe

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Physics Inflaton Parity (physics) Massless particle Axion Particle physics Inflationary epoch Cosmological perturbation theory Hubble's law Inflation (cosmology) Theoretical physics Cosmology Dark matter Quantum mechanics Dark energy Metric expansion of space

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Type: article
Language: en
Landing Page: https://doi.org/10.1088/1475-7516/2023/05/018
PDF: https://iopscience.iop.org/article/10.1088/1475-7516/2023/05/018/pdf
OA Status: hybrid
Cited By: 44
References: 136
Related Works: 10
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DOI: https://doi.org/10.1088/1475-7516/2023/05/018

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Title: Parity-odd and even trispectrum from axion inflation

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Language: en

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Publication year: 2023

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Publication date: 2023-05-01

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Authors: Xuce Niu, Moinul Hossain Rahat, K.N. Srinivasan, Wei Xue

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Landing page: https://doi.org/10.1088/1475-7516/2023/05/018

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Concepts: Physics, Inflaton, Parity (physics), Massless particle, Axion, Particle physics, Inflationary epoch, Cosmological perturbation theory, Hubble's law, Inflation (cosmology), Theoretical physics, Cosmology, Dark matter, Quantum mechanics, Dark energy, Metric expansion of space

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Cited by: 44

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