71 citations · 127 across the 6 of their papers we have counts for
6 papers
Solar System constraints on local dark matter density
Giuseppe De Risi, Tiberiu Harko, Francisco S. N. Lobo
We study how the classical tests of general relativity are modified by the presence of a subdominant dark matter halo in the solar system. We use a general formalism to calculate t…
Induced cosmology on a codimension-2 brane in a conical bulk
G. De Risi
We study the cosmology of a 5-dimensional brane, which represents a regularization of a 4-dimensional codimension-2 brane, embedded in a conical bulk. The brane is assumed to be te…
Classical tests of general relativity in brane world models
Christian G. Boehmer, Giuseppe De Risi, Tiberiu Harko +1
The classical tests of general relativity (perihelion precession, deflection of light, and the radar echo delay) are considered for several spherically symmetric static vacuum solu…
Relic gravitons on Kasner branes
G. De Risi
We present a simple model in which a brane with anisotropic metric is embedded in an AdS bulk. We discuss the localization of the massless mode and the amplification of both the ma…
Space/Time Noncommutativity in String Theories without Background Electric Field
G. De Risi, G. Grignani, M. Orselli
The appearance of space/time non-commutativity in theories of open strings with a constant non-diagonal background metric is considered. We show that, even if the space-time coordi…
Low-energy graceful exit in anisotropic string cosmology backgrounds
G. De Risi, M. Gasperini
We discuss the possibility of a smooth transition from the pre- to the post-big bang regime, in the context of the lowest-order string effective action (without higher-derivative c…