Access count of this item: 33

Files in This Item:
File Description SizeFormat 
0295-5075_111_39002.pdf91.97 kBAdobe PDFView/Open
Title: Multi-disformal invariance of non-linear primordial perturbations
Authors: Watanabe, Yuki
Naruko, Atsushi
Sasaki, Misao  kyouindb  KAKEN_id
Author's alias: 佐々木, 節
Issue Date: 7-Aug-2015
Publisher: IOP Publishing
Journal title: EPL
Volume: 111
Issue: 3
Thesis number: 39002
Abstract: We study disformal transformations of the metric in the cosmological context. We first consider the disformal transformation generated by a scalar field phgr and show that the curvature and tensor perturbations on the uniform phgr slicing, on which the scalar field is homogeneous, are non-linearly invariant under the disformal transformation. Then we discuss the transformation properties of the evolution equations for the curvature and tensor perturbations at full non-linear order in the context of spatial gradient expansion as well as at linear order. In particular, we show that the transformation can be described in two different ways: one that clearly shows the physical invariance and the other that shows an apparent change of the causal structure. Finally we consider a new type of disformal transformation in which a multi-component scalar field comes into play, which we call a "multi-disformal transformation". We show that the curvature and tensor perturbations are invariant at linear order, and also at non-linear order, provided that the system has reached the adiabatic limit.
Rights: This is an author-created, un-copyedited version of an article accepted for publication in 'EPL'. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at
The full-text file will be made open to the public on 7 August 2016 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1209/0295-5075/111/39002
Appears in Collections:Journal Articles

Show full item record

Export to RefWorks

Export Format: 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.