no code implementations • 18 Dec 2020 • Hector O. Silva, Helvi Witek, Matthew Elley, Nicolás Yunes

Scalar fields coupled to the Gauss-Bonnet invariant can undergo a tachyonic instability, leading to spontaneous scalarization of black holes.

General Relativity and Quantum Cosmology High Energy Physics - Theory

no code implementations • 8 Sep 2020 • Carlos A. R. Herdeiro, Eugen Radu, Hector O. Silva, Thomas P. Sotiriou, Nicolás Yunes

It was recently shown that a scalar field suitably coupled to the Gauss-Bonnet invariant $\mathcal{G}$ can undergo a spin-induced linear tachyonic instability near a Kerr black hole.

General Relativity and Quantum Cosmology High Energy Physics - Theory

1 code implementation • 12 Aug 2020 • Hector O. Silva, George Pappas, Nicolás Yunes, Kent Yagi

We also find evidence that the formula currently used by NICER can be used in the inference of the radii of rapidly rotating stars, outside of the formula's domain of validity.

High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology

no code implementations • 2 Apr 2020 • Hector O. Silva, A. Miguel Holgado, Alejandro Cárdenas-Avendaño, Nicolás Yunes

The Neutron Star Interior Composition Explorer (NICER) recently measured the mass and equatorial radius of the isolated neutron star PSR J0030+0451.

General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena

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