All Outputs (6)

Spin-Induced Black Hole Spontaneous Scalarization (2020)
Journal Article
Dima, A., Barausse, E., Franchini, N., & Sotiriou, T. P. (2020). Spin-Induced Black Hole Spontaneous Scalarization. Physical Review Letters, 125(23), Article 231101. https://doi.org/10.1103/PhysRevLett.125.231101

We study scalar fields in a black hole background and show that, when the scalar is suitably coupled to curvature, rapid rotation can induce a tachyonic instability. This instability, which is the hallmark of spontaneous scalarization in the lineariz... Read More about Spin-Induced Black Hole Spontaneous Scalarization.

Black holes, gravitational waves and fundamental physics: A roadmap (2019)
Journal Article
Askar, A., Bertone, G., Bon, E., Blas, D., Brito, R., Burrage, C., …Zilhão, M. (2019). Black holes, gravitational waves and fundamental physics: A roadmap. Classical and Quantum Gravity, 36(14), Article 143001. https://doi.org/10.1088/1361-6382/ab0587

© 2019 IOP Publishing Ltd. The grand challenges of contemporary fundamental physics-dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem-all involve gravity as a key component. And o... Read More about Black holes, gravitational waves and fundamental physics: A roadmap.

Spontaneous scalarization in generalized scalar-tensor theory (2019)
Journal Article
Andreou, N., Franchini, N., Ventagli, G., & Sotiriou, T. P. (2019). Spontaneous scalarization in generalized scalar-tensor theory. Physical Review D, 99(12), https://doi.org/10.1103/physrevd.99.124022

Spontaneous scalarization is a mechanism that endows relativistic stars and black holes with a nontrivial configuration only when their spacetime curvature exceeds some threshold. The standard way to trigger spontaneous scalarization is via a tachyon... Read More about Spontaneous scalarization in generalized scalar-tensor theory.

Classification of shift-symmetric Horndeski theories and hairy black holes (2019)
Journal Article
Saravani, M., & Sotiriou, T. P. (2019). Classification of shift-symmetric Horndeski theories and hairy black holes. Physical Review D, 99(12), Article 124004. https://doi.org/10.1103/physrevd.99.124004

No-hair theorems for scalar-tensor theories imply that the trivial scalar field configuration is the unique configuration around stationary black hole spacetimes. The most basic assumption in these theorems is that a constant scalar configuration is... Read More about Classification of shift-symmetric Horndeski theories and hairy black holes.

Multipole moments and universal relations for scalarized neutron stars (2019)
Journal Article
Pappas, G., Doneva, D. D., Sotiriou, T. P., Yazadjiev, S. S., & Kokkotas, K. D. (2019). Multipole moments and universal relations for scalarized neutron stars. Physical Review D, 99(10), Article 104014. https://doi.org/10.1103/physrevd.99.104014

In recent years there has been a surge of interest in what has come to be known as the “universal relations” between various global properties of neutron stars. These universal relations are equation of state independent relations between quantities... Read More about Multipole moments and universal relations for scalarized neutron stars.

Causal structure of black holes in shift-symmetric Horndeski theories (2018)
Journal Article
Benkel, R., Franchini, N., Saravani, M., & Sotiriou, T. P. (2018). Causal structure of black holes in shift-symmetric Horndeski theories. Physical Review D, 98(6), 1-11. https://doi.org/10.1103/PhysRevD.98.064006

In theories with derivative (self-)interactions, the propagation of perturbations on nontrivial field configurations is determined by effective metrics. Generalized scalar-tensor theories belong in this class and this implies that the matter fields a... Read More about Causal structure of black holes in shift-symmetric Horndeski theories.