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タイトル: | Cosmological disformal invariance |
著者: | Domènech, Guillem Naruko, Atsushi Sasaki, Misao |
著者名の別形: | 佐々木, 節 |
キーワード: | inflation cosmology of theories beyond the SM cosmological perturbation theory |
発行日: | 1-Oct-2015 |
出版者: | IOP Publishing |
誌名: | Journal of Cosmology and Astroparticle Physics |
巻: | 2015 |
号: | 10 |
開始ページ: | 067 |
終了ページ: | 067 |
抄録: | The invariance of physical observables under disformal transformations is considered. It is known that conformal transformations leave physical observables invariant. However, whether it is true for disformal transformations is still an open question. In this paper, it is shown that a pure disformal transformation without any conformal factor is equivalent to rescaling the time coordinate. Since this rescaling applies equally to all the physical quantities, physics must be invariant under a disformal transformation, that is, neither causal structure, propagation speed nor any other property of the fields are affected by a disformal transformation itself. This fact is presented at the action level for gravitational and matter fields and it is illustrated with some examples of observable quantities. We also find the physical invariance for cosmological perturbations at linear and high orders in perturbation, extending previous studies. Finally, a comparison with Horndeski and beyond Horndeski theories under a disformal transformation is made. |
著作権等: | This is an author-created, un-copyedited version of an article accepted for publication in 'Journal of Cosmology and Astroparticle Physics'. 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 http://dx.doi.org/10.1088/1475-7516/2015/10/067. The full-text file will be made open to the public on 1 October 2016 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. 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。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/207648 |
DOI(出版社版): | 10.1088/1475-7516/2015/10/067 |
出現コレクション: | 学術雑誌掲載論文等 |
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