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Title: Vector disformal transformation of cosmological perturbations
Authors: Papadopoulos, Vassilis
Zarei, Moslem
Firouzjahi, Hassan
Mukohyama, Shinji  kyouindb  KAKEN_id
Author's alias: 向山, 信治
Issue Date: 15-Mar-2018
Publisher: American Physical Society (APS)
Journal title: Physical Review D
Volume: 97
Issue: 6
Thesis number: 063521
Abstract: We study disformal transformations of cosmological perturbations by vector fields in theories invariant under U(1) gauge transformations. Three types of vector disformal transformations are considered: (i) disformal transformations by a single timelike vector; (ii) disformal transformations by a single spacelike vector; and (iii) disformal transformations by three spacelike vectors. We show that transformations of type (i) do not change either curvature perturbation or gravitational waves; that those of type (ii) do not change curvature perturbation but change gravitational waves; and that those of type (iii) change both curvature perturbation and gravitational waves. Therefore, coupling matter fields to the metric after disformal transformations of type (ii) or (iii) in principle have observable consequences. While the recent multi-messenger observation of binary neutron stars has singled out a proper disformal frame at the present epoch with a high precision, the result of the present paper may thus help distinguishing disformal frames in the early universe.
Rights: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.
DOI(Published Version): 10.1103/PhysRevD.97.063521
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