Spinning guest fields during inflation: leftover signatures

Emanuela Dimastrogiovanni; Matteo Fasiello; A. Emir Gumrukcuoglu

doi:10.1088/1475-7516/2021/11/047

Spinning guest fields during inflation: leftover signatures

Emanuela Dimastrogiovanni, Matteo Fasiello, A. Emir Gumrukcuoglu

Institute of Cosmology & Gravitation

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Abstract

We consider the possibility of extra spinning particles during inflation, focussing on the spin-2 case. Our analysis relies on the well-known fully non-linear formulation of interacting spin-2 theories. We explore the parameter space of the corresponding inflationary Lagrangian and identify regions therein exhibiting signatures within reach of upcoming CMB probes. We provide a thorough study of the early and late-time dynamics ensuring that stability conditions are met throughout the cosmic evolution. We characterise in particular the gravitational wave spectrum and three-point function finding a local-type non-Gaussianity whose amplitude may be within the sensitivity range of both the LiteBIRD and CMB-S4 experiments.

Original language	English
Article number	047
Number of pages	31
Journal	Journal of Cosmology and Astroparticle Physics
Volume	11
DOIs	https://doi.org/10.1088/1475-7516/2021/11/047
Publication status	Published - 24 Nov 2021

Keywords

cosmological perturbation theory
inflation
modified gravity
non-gaussianity

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10.1088/1475-7516/2021/11/047

2108.06722v2
This Accepted Manuscript is available for reuse under a CC BY-NC-ND licence after the 12 month embargo period provided that all the terms and conditions of the licence are adhered to.
Accepted author manuscript (Post-print), 1.22 MBLicence: CC BY-NC-ND

Cite this

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title = "Spinning guest fields during inflation: leftover signatures",

abstract = " We consider the possibility of extra spinning particles during inflation, focussing on the spin-2 case. Our analysis relies on the well-known fully non-linear formulation of interacting spin-2 theories. We explore the parameter space of the corresponding inflationary Lagrangian and identify regions therein exhibiting signatures within reach of upcoming CMB probes. We provide a thorough study of the early and late-time dynamics ensuring that stability conditions are met throughout the cosmic evolution. We characterise in particular the gravitational wave spectrum and three-point function finding a local-type non-Gaussianity whose amplitude may be within the sensitivity range of both the LiteBIRD and CMB-S4 experiments. ",

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author = "Emanuela Dimastrogiovanni and Matteo Fasiello and Gumrukcuoglu, {A. Emir}",

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T2 - leftover signatures

AU - Dimastrogiovanni, Emanuela

AU - Fasiello, Matteo

AU - Gumrukcuoglu, A. Emir

N1 - 30 pages, 6 figures; v2 -- references added, minor changes, accepted for publication in JCAP

PY - 2021/11/24

Y1 - 2021/11/24

N2 - We consider the possibility of extra spinning particles during inflation, focussing on the spin-2 case. Our analysis relies on the well-known fully non-linear formulation of interacting spin-2 theories. We explore the parameter space of the corresponding inflationary Lagrangian and identify regions therein exhibiting signatures within reach of upcoming CMB probes. We provide a thorough study of the early and late-time dynamics ensuring that stability conditions are met throughout the cosmic evolution. We characterise in particular the gravitational wave spectrum and three-point function finding a local-type non-Gaussianity whose amplitude may be within the sensitivity range of both the LiteBIRD and CMB-S4 experiments.

AB - We consider the possibility of extra spinning particles during inflation, focussing on the spin-2 case. Our analysis relies on the well-known fully non-linear formulation of interacting spin-2 theories. We explore the parameter space of the corresponding inflationary Lagrangian and identify regions therein exhibiting signatures within reach of upcoming CMB probes. We provide a thorough study of the early and late-time dynamics ensuring that stability conditions are met throughout the cosmic evolution. We characterise in particular the gravitational wave spectrum and three-point function finding a local-type non-Gaussianity whose amplitude may be within the sensitivity range of both the LiteBIRD and CMB-S4 experiments.

KW - cosmological perturbation theory

KW - inflation

KW - modified gravity

KW - non-gaussianity

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DO - 10.1088/1475-7516/2021/11/047

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VL - 11

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

M1 - 047

ER -

Spinning guest fields during inflation: leftover signatures

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