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Matter bispectrum beyond Horndeski

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arxiv 1801.07885 v2 pith:6JQCU74Z submitted 2018-01-24 astro-ph.CO gr-qchep-th

Shin'ichi Hirano , Tsutomu Kobayashi , Hiroyuki Tashiro , Shuichiro Yokoyama This is my paper · ORCID
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keywords horndeskimatterbeyondbispectrumtheorygeneralinteractionssecond-order
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abstract

The Horndeski scalar-tensor theory and its recent extensions allow nonlinear derivative interactions of the scalar degree of freedom. We study the matter bispectrum of large scale structure as a probe of these modified gravity theories, focusing in particular on the effect of the terms that newly appear in the so-called "beyond Horndeski" theories. We derive the second-order solution for the matter density perturbations and find that the interactions beyond Horndeski lead to a new time-dependent coefficient in the second-order kernel which differs in general from the standard value of general relativity and the Horndeski theory. This can deform the matter bispectrum at the folded triangle configurations ($k_1+k_2=k_3$), while it is never possible within the Horndeski theory.

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Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Modelling the matter bispectrum at small scales in modified gravity

    astro-ph.CO 2019-09 conditional novelty 5.0 of 10

    No existing matter-bispectrum model is accurate enough for Stage IV lensing surveys across the tested modified gravity theories, and a halo-model-corrected fitting formula is the most accurate option tested.

  2. Parametrizations for tests of gravity

    astro-ph.CO 2019-08 accept novelty 1.0 of 10

    A review of parametrized frameworks (PPF, EFT, PPN, ppE) for testing gravity across cosmological and astrophysical scales, with an outlook toward unification.

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