5 papers
The divergence of Van Hove's model and its consequences
Fulvio Sbisà
We study a regularized version of Van Hove's 1952 model, in which a quantum field interacts linearly with sources of finite width lying at fixed positions. We show that the central…
On Léon van Hove's 1952 article on the foundations of Quantum Field Theory
Fulvio Sbisà
In 1952, Léon van Hove published an article, in French, with the title ``Les difficultés de divergences pour um modèle particulier de champ quantifié''. The article is frequently c…
Neutron star masses in -gravity
Fulvio Sbisà, Pedro O. Baqui, Tays Miranda +2
We address the issue of the existence of inequivalent definitions of gravitational mass in -gravity. We present several definitions of gravitational mass, and discuss the fo…
Degravitation and the Cascading DGP Model
Fulvio Sbisà
We consider the 6D Cascading DGP model, a braneworld model which is a promising candidate to realize the phenomenon of the degravitation of vacuum energy. Focusing on a recently pr…
Pressure effects in the weak-field limit of f(R) = R + alpha R^2 gravity
Fulvio Sbisà, Oliver F. Piattella, Sergio E. Jorás
We investigate the linear regime of f(R) = R + alpha R^2 gravity for static, spherically symmetric and asymptotically flat configurations of matter. We show that, in vacuum and dee…