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In search of large signals at the cosmological collider

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Abstract

We look for oscillating signals in the primordial bispectrum from new physics heavy particles which are visibly large for next generation large scale structures (LSS) survey. We show that in ordinary inflation scenarios where a slow-rolling inflaton generates density fluctuations and with no breaking of scale invariance or spacetime symmetry, there exist no naturally large signals unless the rolling inflaton generates a parity-odd chemical potential for the heavy particles. We estimate the accessibility of this signal through observations. While current CMB data are already sensitive in the most optimistic scenario, future probes, including LSS survey and 21 cm observation, can cover interesting regions of the model space.

A preprint version of the article is available at ArXiv.

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Correspondence to Zhong-Zhi Xianyu.

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ArXiv ePrint: 1910.12876

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Wang, L., Xianyu, Z. In search of large signals at the cosmological collider. J. High Energ. Phys. 2020, 44 (2020). https://doi.org/10.1007/JHEP02(2020)044

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Keywords

  • Cosmology of Theories beyond the SM
  • Beyond Standard Model
  • Effective Field Theories