Next Article in Journal
Seeing Black Holes: From the Computer to the Telescope
Next Article in Special Issue
Preinflationary Dynamics of Power-Law Potential in Loop Quantum Cosmology
Previous Article in Journal / Special Issue
Gravitational Waves in Einstein-Æther Theory and Generalized TeVeS Theory after GW170817
Article Menu
Issue 8 (August) cover image

Export Article

Open AccessConference Report
Universe 2018, 4(8), 85; https://doi.org/10.3390/universe4080085

The Polarizations of Gravitational Waves

School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
This paper is based on the talk on the International Conference on Quantum Gravity, Shenzhen, China, 26–28 March 2018.
*
Author to whom correspondence should be addressed.
Received: 25 June 2018 / Revised: 1 August 2018 / Accepted: 1 August 2018 / Published: 6 August 2018
(This article belongs to the Special Issue Gravity, Black Holes and Cosmology XXI)
Full-Text   |   PDF [395 KB, uploaded 6 August 2018]   |  

Abstract

The gravitational wave provides a new method to examine General Relativity and its alternatives in the high speed, strong field regime. Alternative theories of gravity generally predict more polarizations than General Relativity, so it is important to study the polarization contents of theories of gravity to reveal the nature of gravity. In this talk, we analyze the polarization contents of Horndeski theory and f(R) gravity. We find out that in addition to the familiar plus and cross polarizations, a massless Horndeski theory predicts an extra transverse polarization, and there is a mix of pure longitudinal and transverse breathing polarizations in the massive Horndeski theory and f(R) gravity. It is possible to use pulsar timing arrays to detect the extra polarizations in these theories. We also point out that the classification of polarizations using Newman–Penrose variables cannot be applied to massive modes. It cannot be used to classify polarizations in Einstein-æther theory or generalized Tensor-Vector-Scalar (TeVeS) theory, either. View Full-Text
Keywords: gravitational waves; polarizations; E(2) classification gravitational waves; polarizations; E(2) classification
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Gong, Y.; Hou, S. The Polarizations of Gravitational Waves. Universe 2018, 4, 85.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Universe EISSN 2218-1997 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top