English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Resonant gravitational waves in dynamical Chern–Simons–axion gravity

Fujita, T., Obata, I., Tanaka, T., & Yamada, K. (2020). Resonant gravitational waves in dynamical Chern–Simons–axion gravity. Classical and Quantum Gravity, 38(4): 045010. doi:10.1088/1361-6382/abce49.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
Resonant gravitational waves in dynamical Chern–Simons–axion gravity.pdf (Any fulltext), 2MB
 
File Permalink:
-
Name:
Resonant gravitational waves in dynamical Chern–Simons–axion gravity.pdf
Description:
-
OA-Status:
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Fujita, Tomohiro, Author
Obata, Ippei1, Author           
Tanaka, Takahiro, Author
Yamada, Kei, Author
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

Content

show
hide
Free keywords: -
 Abstract: In this paper, we consider dynamical Chern–Simons gravity with the identification of the scalar field coupled though the Pontryagin density with the axion dark matter, and we discuss the effects of the parametric resonance on gravitational waves (GWs). When we consider GWs in a coherently oscillating axion cloud, we confirm that significant resonant amplification of GWs occurs in a narrow frequency band, and the amplification is restricted to the late epoch after the passage of the incident waves. We also identify the condition that an axion cloud spontaneously emits GWs. Once we take into account the randomness of the spatial phase distribution of the axion oscillations, we find that the amplification is suppressed compared with the coherent case, but significant amplification of GWs can still occur. We also examine whether or not the amplification of GWs is possible in the present Universe, taking into account the history of the Universe. We find that resonant amplification is difficult to be tested from GW observations in the standard scenario of the axion DM model, in which the axion is the dominant component of DM. However, there is some parameter window in which the resonant amplification of GWs might be observed, if the axion is subdominant component of DM, and the axion cloud formation is delayed until the Hubble rate becomes much smaller than the axion mass.

Details

show
hide
Language(s): eng - English
 Dates: 2020-12-24
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1361-6382/abce49
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Classical and Quantum Gravity
  Abbreviation : Class. Quantum Gravity
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 38 (4) Sequence Number: 045010 Start / End Page: - Identifier: ISSN: 0264-9381
ISSN: 1361-6382