Imperial College London
Alternate

Prof Joao Magueijo

Faculty of Natural Sciences, Department of Physics

Professor of Physics
 
 
 
//

Contact

 

j.magueijo Website

 
 
//

Location

 

Huxley BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Alexander:2020:10.1103/PhysRevD.102.044039,
author = {Alexander, S and Jenks, L and Jirousek, P and Magueijo, J and Zlosnik, T},
doi = {10.1103/PhysRevD.102.044039},
journal = {Physical Review D: Particles, Fields, Gravitation and Cosmology},
pages = {044039  1--044039  13},
title = {Gravity waves in parity-violating Copernican universes},
url = {http://dx.doi.org/10.1103/PhysRevD.102.044039},
volume = {102},
year = {2020}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In recent work minimal theories allowing the variation of the cosmological constant, Λ, by means of a balancing torsion, have been proposed. It was found that such theories contain parity violating homogeneous and isotropic solutions, due to a torsion structure called the Cartan spiral staircase. Their dynamics are controlled by Euler and Pontryagin quasitopological terms in the action. Here we show that such theories predict a dramatically different picture for gravitational wave fluctuations in the parity violating branch. If the dynamics are ruled solely by the Euler-type term, then linear tensor mode perturbations are entirely undetermined, hinting at a new type of gauge invariance. The Pontryagin term not only permits for phenomenologically sounder background solutions (as found in previous literature), but for realistic propagation of gravitational wave modes. These have the general property that the right and left handed gravitational waves propagate with different speeds. More generally they imply modified dispersion relations for the graviton, with both parity violating and non-violating deformations, including an effective mass for both gravitational wave polarizations. We discuss the observational constraints and predictions of these theories.
AU  - Alexander,S
AU  - Jenks,L
AU  - Jirousek,P
AU  - Magueijo,J
AU  - Zlosnik,T
DO  - 10.1103/PhysRevD.102.044039
EP  - 1
PY  - 2020///
SN  - 1550-2368
SP  - 044039
TI  - Gravity waves in parity-violating Copernican universes
T2  - Physical Review D: Particles, Fields, Gravitation and Cosmology
UR  - http://dx.doi.org/10.1103/PhysRevD.102.044039
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000562321500005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.044039
UR  - http://hdl.handle.net/10044/1/82673
VL  - 102
ER  -
Download