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Gravitational Rainbows: LIGO and Dark Energy at its Cutoff
/ de Rham, Claudia ; Melville, Scott
The recent direct detection of gravitational waves from a neutron star merger with optical counterpart has been used to severely constrain models of dark energy that typically predict a modification of the gravitational wave speed. [...]
Published in Physical Review Letters 121 (2018)
10.1103/PhysRevLett.121.221101
arXiv:1806.09417
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Non-compact nonlinear sigma models
/ de Rham, Claudia ; Tolley, Andrew J. ; Zhou, Shuang-Yong
The target space of a nonlinear sigma model is usually required to be positive definite to avoid ghosts. [...]
Published in Physics letters B (2016)
10.1016/j.physletb.2016.07.035
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Ostrogradsky in theories with multiple fields
/ de Rham, Claudia ; Matas, Andrew
We review how the (absence of) Ostrogradsky instability manifests itself in theories with multiple fields. [...]
Published in JCAP 1606 (2016) 041
10.1088/1475-7516/2016/06/041
arXiv:1604.08638
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Riding on irrelevant operators
/ de Rham, Claudia ; Ribeiro, Raquel H.
We investigate the stability of a class of derivative theories known as P(X) and Galileons against corrections generated by quantum effects. [...]
Published in JCAP 1411 (2014) 016
10.1088/1475-7516/2014/11/016
arXiv:1405.5213
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Galileon duality
/ de Rham, Claudia ; Fasiello, Matteo ; Tolley, Andrew J.
We show that every Galileon theory admits a dual formulation as a Galileon theory with new operator coefficients. [...]
Published in Physics letters B (2014)
10.1016/j.physletb.2014.03.061
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