6 papers · 1 filter
Infrared Screening of the Cosmological Constant
Vincenzo Branchina, Riccardo Gandolfo, Arcangelo Pernace
The observed cosmological constant is set by the deepest infrared scale of the present universe rather than by the microscopic scales that contribute to the vacuum energy. We show…
Quantum gravity and spectral running cutoff
Carlo Branchina, Vincenzo Branchina, Filippo Contino +2
We have recently shown that a natural way to implement the Wilsonian paradigm in gauge theories is through the introduction of a ``spectral cutoff", a cut on the eigenvalues of the…
Hard cutoff and gauge theories
V. Branchina, F. Contino, R. Gandolfo +1
According to usual calculations, the use of a hard cutoff in gauge theories leads to a violation of gauge invariance. This seems to generate a tension between gauge theories an…
Gravity and the Higgs boson mass
Carlo Branchina, Vincenzo Branchina, Filippo Contino +2
According to usual calculations, both in flat and curved spacetime, the mass of a scalar particle is quadratically sensitive to the ultimate scale of the theory, the UV physi…
Diffeomorphism invariance of the effective gravitational action
Carlo Branchina, Vincenzo Branchina, Filippo Contino +2
We investigate on the diffeomorphism invariance of the effective gravitational action, focusing in particular on the path integral measure. In the literature, two different measure…
On the RG flow of the Newton and cosmological constant
Carlo Branchina, Vincenzo Branchina, Filippo Contino +2
In this note we comment on the RG flow of the Newton and cosmological constants, also in view of some recent claims [1] that would rise some doubts on the validity of our recent wo…