MG15 - Talk detail |
|
Participant |
Hirano, Shin'ichi | |||||||
|
Institution |
Rikkyo University - 4-12-1-408, KIDUKI - NAKAHARA-KU, KAWASAKI-SHI - KANAGAWA-KEN - Japan | |||||||
|
Session |
AT4 |
Accepted |
Yes |
Order |
2 |
Time |
15:45 | 20' |
|
Talk |
Oral abstract |
Title |
Matter bispectrum beyond Horndeski | |||||
| Coauthors | Tsutomu Kobayashi, Hiroyuki Tashiro, Shuichiro Yokoyama | |||||||
|
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. |
|||||||
Pdf file |
||||||||