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Position and frequency shifts induced by massive modes of the gravitational wave background in alternative gravity
S. Bellucci, S. Capozziello, M. De Laurentis +1
Alternative theories of gravity predict the presence of massive scalar, vector, and tensor gravitational wave modes in addition to the standard massless spin~2 graviton of general…
What is the fate of a black hole embedded in an expanding universe?
Valerio Faraoni, Changjun Gao, Xuelei Chen +1
Within a large class of exact solutions of the Einstein equations describing a black hole embedded in a Friedmann universe it is shown that, under certain assumptions, only those w…
Extension of the EGS theorem to metric and Palatini f(R) gravity
Valerio Faraoni
By using the equivalence between metric and Palatini f(R) (or "modified") gravities with omega=0, -3/2 Brans-Dicke theories, it is shown that the Ehlers-Geren-Sachs theorem of gene…
f(R) gravity: successes and challenges
Valerio Faraoni
We review the state of the art of f(R) theories of gravity (in their various formulations), which have been proposed as an explanation of the cosmic acceleration alternative to dar…
Breakdown of the initial value formulation of scalar-tensor gravity and its physical meaning
Valerio Faraoni, Nicolas Lanahan-Tremblay
We revisit singularities of two distinct kinds in the Cauchy problem of general scalar-tensor theories of gravity (previously discussed in the literature), and of metric and Palati…
Palatini f(R) gravity as a fixed point
Valerio Faraoni
In the context of modified gravity, we point out how the Palatini version of these theories is singled out as a very special case corresponding to the unique fixed point of a trans…
f(R) Theories Of Gravity
Thomas P. Sotiriou, Valerio Faraoni
Modified gravity theories have received increased attention lately due to combined motivation coming from high-energy physics, cosmology and astrophysics. Among numerous alternativ…
Modified gravity with R-matter couplings and (non-)geodesic motion
Thomas P. Sotiriou, Valerio Faraoni
We consider alternative theories of gravity with a direct coupling between matter and the Ricci scalar We study the relation between these theories and ordinary scalar-tensor gravi…
Reconstructing the universe history, from inflation to acceleration, with phantom and canonical scalar fields
Emilio Elizalde, Shin'ichi Nojiri, Sergei D. Odintsov +2
We consider the reconstruction technique in theories with a single or multiple (phantom and/or canonical) scalar fields. With the help of several examples, it is demonstrated expli…
Does the mass of a black hole decrease due to the accretion of phantom energy
Changjun Gao, Xuelei Chen, Valerio Faraoni +1
According to Babichev et al., the accretion of a phantom test fluid onto a Schwarzschild black hole will induce the mass of the black hole to decrease, however the backreaction was…