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Partially massless fields during inflation

  • Regular Article - Theoretical Physics
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  • Published: 26 April 2018
  • Volume 2018, article number 140, (2018)
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Partially massless fields during inflation
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  • Daniel Baumann1,
  • Garrett Goon1,2,
  • Hayden Lee  ORCID: orcid.org/0000-0002-7577-08063,4 &
  • …
  • Guilherme L. Pimentel1 

  • 500 Accesses

  • 66 Citations

  • 8 Altmetric

  • 1 Mention

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A preprint version of the article is available at arXiv.

Abstract

The representation theory of de Sitter space allows for a category of partially massless particles which have no flat space analog, but could have existed during inflation. We study the couplings of these exotic particles to inflationary perturbations and determine the resulting signatures in cosmological correlators. When inflationary perturbations interact through the exchange of these fields, their correlation functions inherit scalings that cannot be mimicked by extra massive fields. We discuss in detail the squeezed limit of the tensor-scalar-scalar bispectrum, and show that certain partially massless fields can violate the tensor consistency relation of single-field inflation. We also consider the collapsed limit of the scalar trispectrum, and find that the exchange of partially massless fields enhances its magnitude, while giving no contribution to the scalar bispectrum. These characteristic signatures provide clean detection channels for partially massless fields during inflation.

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Authors and Affiliations

  1. Institute of Theoretical Physics, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH, The Netherlands

    Daniel Baumann, Garrett Goon & Guilherme L. Pimentel

  2. Institute for Theoretical Physics, Utrecht University, Princetonplein 5, Utrecht, 3584 CC, The Netherlands

    Garrett Goon

  3. Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA, 02138, U.S.A.

    Hayden Lee

  4. Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

    Hayden Lee

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Correspondence to Hayden Lee.

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ArXiv ePrint: 1712.06624

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Baumann, D., Goon, G., Lee, H. et al. Partially massless fields during inflation. J. High Energ. Phys. 2018, 140 (2018). https://doi.org/10.1007/JHEP04(2018)140

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  • Received: 05 February 2018

  • Revised: 07 March 2018

  • Accepted: 19 April 2018

  • Published: 26 April 2018

  • DOI: https://doi.org/10.1007/JHEP04(2018)140

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Keywords

  • Cosmology of Theories beyond the SM
  • Higher Spin Symmetry
  • Conformal and W Symmetry
  • Higher Spin Gravity
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