Citation

BibTex format

@article{Jazayeri:2023:12/035,
author = {Jazayeri, S and Renaux-Petel, S and Werth, D},
doi = {12/035},
journal = {Journal of Cosmology and Astroparticle Physics},
title = {Shapes of the cosmological low-speed collider},
url = {http://dx.doi.org/10.1088/1475-7516/2023/12/035},
volume = {dec 2023},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Massive particles produced during inflation leave specific signatures in soft limits of correlation functions of primordial fluctuations. When the Goldstone boson of broken time translations acquires a reduced speed of sound, implying that de Sitter boosts are strongly broken, we introduce a novel discovery channel to detect new physics during inflation, called the cosmological low-speed collider signal. This signal is characterised by a distinctive resonance lying in mildly-soft kinematic configurations of cosmological correlators, indicating the presence of a heavy particle, whose position enables to reconstruct its mass. We show that this resonance can be understood in terms of a non-local single-field effective field theory, in which the heavy field becomes effectively non-dynamical. This theory accurately describes the full dynamics of the Goldstone boson and captures all multi-field physical effects distinct from the non-perturbative particle production leading to the conventional cosmological collider signal. As such, this theory provides a systematic and tractable way to study the imprint of massive fields on cosmological correlators. We conduct a thorough study of the low-speed collider phenomenology in the scalar bispectrum, showing that large non-Gaussianities with new shapes can be generated, in particular beyond weak mixing. We also provide a low-speed collider template for future cosmological surveys.
AU  - Jazayeri,S
AU  - Renaux-Petel,S
AU  - Werth,D
DO  - 12/035
PY  - 2023///
SN  - 1475-7516
TI  - Shapes of the cosmological low-speed collider
T2  - Journal of Cosmology and Astroparticle Physics
UR  - http://dx.doi.org/10.1088/1475-7516/2023/12/035
VL  - dec 2023
ER  -
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