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Modified gravity theories have received increased attention lately due to combined motivation coming from high-energy physics, cosmology and astrophysics. Among numerous alternatives to Einsteinâ€™sâ€¦ (More)

- Vitor Cardoso, Isabella P Carucci, Paolo Pani, Thomas P. Sotiriou
- Physical review letters
- 2013

We uncover two mechanisms that can render Kerr black holes unstable in scalar-tensor gravity, both associated with the presence of matter in the vicinity of the black hole and the fact that thisâ€¦ (More)

- Thomas P. Sotiriou, Matt Visser, Silke E. Ch. Weinfurtner
- Physical review letters
- 2009

Horava's "Lifschitz point gravity" has many desirable features, but in its original incarnation one is forced to accept a nonzero cosmological constant of the wrong sign to be compatible withâ€¦ (More)

- Paolo Pani, Thomas P. Sotiriou
- Physical review letters
- 2012

Eddington-inspired Born-Infeld gravity was recently proposed as an alternative to general relativity that offers a resolution of spacetime singularities. The theory differs from Einstein's gravityâ€¦ (More)

- Thomas P. Sotiriou, Shuang-Yong Zhou
- Physical review letters
- 2014

The most general action for a scalar field coupled to gravity that leads to second-order field equations for both the metric and the scalar--Horndeski's theory--is considered, with the extraâ€¦ (More)

For both f(R) theories of gravity with an independent symmetric connection (no torsion), usually referred to as Palatini f(R) gravity theories, and for f(R) theories of gravity with torsion but noâ€¦ (More)

There has been a significant surge of interest in Horavaâ€™s model for 3+1 dimensional quantum gravity, this model being based on anisotropic scaling at a z = 3 Lifshitz point. Horavaâ€™s model, and itsâ€¦ (More)

General Relativity assumes that spacetime is fully described by the metric alone. An alternative is the so called Palatini formalism where the metric and the connections are taken as independentâ€¦ (More)

Non-vacuum static spherically-symmetric solutions in Palatini f(R) gravity are examined. It is shown that for generic choices of f(R), there are commonly-used equations of state for which noâ€¦ (More)

In the present paper we will investigate the relation between scalar-tensor theory and f(R) theories of gravity. Such studies have been performed in the past for the metric formalism of f(R) gravity;â€¦ (More)