MG15 - Talk detail |
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Participant |
Hirano, Shin'ichi | |||||||
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Institution |
Rikkyo University - 4-12-1-408, KIDUKI - NAKAHARA-KU, KAWASAKI-SHI - KANAGAWA-KEN - Japan | |||||||
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Session |
AT4 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Matter bispectrum beyond Horndeski | |||||
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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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