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Growth of accretion driven scalar hair around Kerr black holes
Jamie Bamber, Katy Clough, Pedro G. Ferreira +2
Scalar fields around compact objects are of interest for scalar-tensor theories of gravity and dark matter models consisting of a massive scalar, e.g. axions. We study the behaviou…
Phase effects from strong gravitational lensing of gravitational waves
Jose María Ezquiaga, Daniel E. Holz, Wayne Hu +2
Assessing the probability that two or more gravitational waves (GWs) are lensed images of the same source requires an understanding of the image properties, including their relativ…
Apparent Superluminality of Lensed Gravitational Waves
Jose María Ezquiaga, Wayne Hu, Macarena Lagos
We consider gravitational wave (GW) sources with an associated electromagnetic (EM) counterpart, and analyze the time delay between both signals in the presence of lensing. If GWs…
Gravitational couplings in Chameleon models
Macarena Lagos, Hanjue Zhu
We consider cosmological models where dark energy is described by a dynamical field equipped with the Chameleon screening mechanism, which serves to hide its effects in local dense…
Anomalous decay rate of quasinormal modes
Macarena Lagos, Pedro G. Ferreira, Oliver J. Tattersall
The decay timescales of the quasinormal modes of a massive scalar field have an intriguing behavior: they either grow or decay with increasing angular harmonic numbers , depe…