Imperial College London
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Claudia de Rham

Faculty of Natural Sciences, Department of Physics

Professor of Theoretical Physics
 
 
 
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Contact

 

c.de-rham CV

 
 
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Location

 

H506Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{de:2019:10.1103/PhysRevD.100.124023,
author = {de, Rham C and Zhang, J},
doi = {10.1103/PhysRevD.100.124023},
journal = {Physical Review D: Particles, Fields, Gravitation and Cosmology},
pages = {124023--1--124023--12},
title = {Perturbations of stealth black holes in degenerate higher-order scalar-tensor theories},
url = {http://dx.doi.org/10.1103/PhysRevD.100.124023},
volume = {100},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Among the scalar-tensor modified theories of gravity, degenerate higher-order scalar-tensor (DHOST) models could play a special role for dark energy while being consistent with current observations, notably those constraining the speed of gravitational waves. Schwarzschild–de Sitter black holes were shown to be exact solutions of a particular subclass of quadratic DHOST theories, while carrying a nontrivial scalar profile that linearly evolves in time and hence potentially providing exciting new phenomenological windows to explore this model. We investigate the physical perturbations about such black holes and find that the odd-parity tensor perturbations behave in a way indistinguishable to general relativity. On the other hand, the effective metric for the (even-parity) scalar perturbations is singular, indicating that those exact black hole solutions are infinitely strongly coupled and cannot be trusted within the regime of validity of the DHOST effective field theory. We show how this strong coupling result is generalizable to a whole class of solutions with arbitrary manifolds both for DHOST and Horndeski.
AU  - de,Rham C
AU  - Zhang,J
DO  - 10.1103/PhysRevD.100.124023
EP  - 1
PY  - 2019///
SN  - 1550-2368
SP  - 124023
TI  - Perturbations of stealth black holes in degenerate higher-order scalar-tensor theories
T2  - Physical Review D: Particles, Fields, Gravitation and Cosmology
UR  - http://dx.doi.org/10.1103/PhysRevD.100.124023
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000501489300002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://journals.aps.org/prd/abstract/10.1103/PhysRevD.100.124023
UR  - http://hdl.handle.net/10044/1/79114
VL  - 100
ER  -
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