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Title: Stellar pulsations in beyond Horndeski gravity theories

Abstract

Theories of gravity in the beyond Horndeski class recover the predictions of general relativity in the solar system whilst admitting novel cosmologies, including late-time de Sitter solutions in the absence of a cosmological constant. Deviations from Newton's law are predicted inside astrophysical bodies, which allow for falsifiable, smoking-gun tests of the theory. In this work we study the pulsations of stars by deriving and solving the wave equation governing linear adiabatic oscillations to find the modified period of pulsation. Using both semi-analytic and numerical models, we perform a preliminary survey of the stellar zoo in an attempt to identify the best candidate objects for testing the theory. Brown dwarfs and Cepheid stars are found to be particularly sensitive objects and we discuss the possibility of using both to test the theory.

Authors:
 [1]; ;  [2]
  1. Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, 209 S. 33rd St., Philadelphia, PA 19104 (United States)
  2. Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX (United Kingdom)
Publication Date:
OSTI Identifier:
22679999
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CEPHEIDS; COSMOLOGY; DE SITTER SPACE; FORECASTING; GENERAL RELATIVITY THEORY; GRAVITATION; OSCILLATIONS; PULSATIONS; SOLAR SYSTEM; STARS; WAVE EQUATIONS

Citation Formats

Sakstein, Jeremy, Kenna-Allison, Michael, and Koyama, Kazuya, E-mail: sakstein@physics.upenn.edu, E-mail: mka1g13@soton.ac.uk, E-mail: kazuya.koyama@port.ac.uk. Stellar pulsations in beyond Horndeski gravity theories. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/03/007.
Sakstein, Jeremy, Kenna-Allison, Michael, & Koyama, Kazuya, E-mail: sakstein@physics.upenn.edu, E-mail: mka1g13@soton.ac.uk, E-mail: kazuya.koyama@port.ac.uk. Stellar pulsations in beyond Horndeski gravity theories. United States. doi:10.1088/1475-7516/2017/03/007.
Sakstein, Jeremy, Kenna-Allison, Michael, and Koyama, Kazuya, E-mail: sakstein@physics.upenn.edu, E-mail: mka1g13@soton.ac.uk, E-mail: kazuya.koyama@port.ac.uk. Wed . "Stellar pulsations in beyond Horndeski gravity theories". United States. doi:10.1088/1475-7516/2017/03/007.
@article{osti_22679999,
title = {Stellar pulsations in beyond Horndeski gravity theories},
author = {Sakstein, Jeremy and Kenna-Allison, Michael and Koyama, Kazuya, E-mail: sakstein@physics.upenn.edu, E-mail: mka1g13@soton.ac.uk, E-mail: kazuya.koyama@port.ac.uk},
abstractNote = {Theories of gravity in the beyond Horndeski class recover the predictions of general relativity in the solar system whilst admitting novel cosmologies, including late-time de Sitter solutions in the absence of a cosmological constant. Deviations from Newton's law are predicted inside astrophysical bodies, which allow for falsifiable, smoking-gun tests of the theory. In this work we study the pulsations of stars by deriving and solving the wave equation governing linear adiabatic oscillations to find the modified period of pulsation. Using both semi-analytic and numerical models, we perform a preliminary survey of the stellar zoo in an attempt to identify the best candidate objects for testing the theory. Brown dwarfs and Cepheid stars are found to be particularly sensitive objects and we discuss the possibility of using both to test the theory.},
doi = {10.1088/1475-7516/2017/03/007},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 03,
volume = 2017,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}