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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of Naples Federico IIIT4k papers
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49 papers · 1 filter
Some aspects of the cosmological conformal equivalence between ``Jordan Frame'' and ``Einstein Frame''
Salvatore Capozziello, Ruggiero de Ritis, Alma Angela Marino
The conformal equivalence between Jordan frame and Einstein frame can be used in order to search for exact solutions in general theories of gravity in which scalar fields are minim…
The B -> X_s gamma gamma rare decay
Laura Reina, Giulia Ricciardi, Amarjit Soni
The rare decay B -> X_s gamma gamma is studied in the Standard Model (SM) and in two different versions (Model I and Model II) of the Two Higgs Doublet Model (2HDM). In the SM the…
Three Dimensional Gross-Neveu Model on Curved Spaces
Gennaro Miele, Patrizia Vitale
The large N limit of the 3-d Gross-Neveu model is here studied on manifolds with positive and negative constant curvature. Using the -function regularization we analyze the crit…
General Relativity in terms of Dirac Eigenvalues
Giovanni Landi, Carlo Rovelli
The eigenvalues of the Dirac operator on a curved spacetime are diffeomorphism-invariant functions of the geometry. They form an infinite set of ``observables'' for general relativ…
Wigner's Problem and Alternative Commutation Relations for Quantum Mechanics
V. I. Man'ko, G. Marmo, E. C. G. Sudarshan +1
It is shown, that for quantum systems the vectorfield associated with the equations of motion may admit alternative Hamiltonian descriptions, both in the Schrödinger and Heisenberg…
f-Oscillators and Nonlinear Coherent States
V. I. Man'ko, G. Marmo, E. C. G. Sudarshan +1
The notion of f-oscillators generalizing q-oscillators is introduced. For classical and quantum cases, an interpretation of the f-oscillator is provided as corresponding to a speci…
Classical solutions of Maxwell equations and the tunneling photon effect
S. Esposito
We propose a very simple but general method to construct solutions of Maxwell equations propagating with a group velocity . Applications to wave guides and a possibl…
CP violation in kaon decays
G. D'Ambrosio, G. Isidori
We review the Standard Model predictions of CP violation in kaon decays. We present an elementary introduction to Chiral Perturbation Theory, four--quark effective hamiltonians and…
Continuum limit of finite temperature from lattice Monte Carlo
G. Bimonte, D. Iñiguez, A. Tarancón +1
The model at finite temperature is simulated on the lattice. For fixed we compute the transition line for by means of Finite Size Scaling techniques.…
Heat-kernel Coefficients and Spectra of the Vector Laplacians on Spherical Domains with Conical Singularities
Lara De Nardo, Dmitri V. Fursaev, Gennaro Miele
The spherical domains with conical singularities are a convenient arena for studying the properties of tensor Laplacians on arbitrary manifolds with such a kind of singular…
Defocusing gravitational microlensing
Salvatore Capozziello, Ruggiero de Ritis, Vladimir Mank'o +2
We introduce the notion of defocusing gravitational lens considering a MACHO located behind a light source with respect to an observer. The consequence of defocusing effect is a te…
Axial Gauge in Euclidean Quantum Gravity
Ivan G. Avramidi, Giampiero Esposito, Alexander Yu. Kamenshchik
The axial gauge is applied to the analysis of Euclidean quantum gravity on manifolds with boundary. A set of boundary conditions which are completely invariant under infinitesimal…
Luminosity variation in (de)focusing microlensing
Salvatore Capozziello, Ruggiero de Ritis, Vladimir Mank'o +2
The luminosity variation of a stellar source due to the gravitational microlensing effect can be considered also if the light rays are defocused (instead of focused) toward the obs…
Fermion Hilbert Space and Fermion Doubling in the Noncommutative Geometry Approach to Gauge Theories
F. Lizzi, G. Mangano, G. Miele +1
In this paper we study the structure of the Hilbert space for the recent noncommutative geometry models of gauge theories. We point out the presence of unphysical degrees of freedo…
Quantized Maxwell Theory in a Conformally Invariant Gauge
Giampiero Esposito
Maxwell theory can be studied in a gauge which is invariant under conformal rescalings of the metric, and first proposed by Eastwood and Singer. This paper studies the correspondin…
Rare B \to K^{(*)} ν\barνDecays at B Factories
P. Colangelo, F. De Fazio, P. Santorelli +1
We compute the branching fraction of the decays and in the Standard Model. We also comment on the experimental difficulties and procedures to de…
Vector meson exchange contributions to K --> pi gamma gamma and K(L) -> gamma lepton+ lepton-
Giancarlo D'Ambrosio, Jorge Portoles
We have studied in the framework of Chiral Perturbation Theory (ChPT) the O(p^6) Vector Meson contributions to K -> pi gamma gamma and K(L) -> gamma gamma^*. We construct the most…
Anyonic Realization of the Quantum Affine Lie Superalgebra U_q(A(M,N)^{(1)})
L. Frappat, A. Sciarrino, S. Sciuto +1
We give a realization of the quantum affine Lie superalgebras U_q(A(M,N))^(1) in terms of anyons defined on a one or two-dimensional lattice, the deformation parameter q being rela…
Unified Gauge Models and One-Loop Quantum Cosmology
Giampiero Esposito, Alexander Yu. Kamenshchik, Gennaro Miele
This paper studies the normalizability criterion for the one-loop wave function of the universe in a de Sitter background, when various unified gauge models are considered. It turn…
Comment on ``Confirmation of the Sigma Meson''
Masayasu Harada, Francesco Sannino, Joseph Schechter
We comment on the recent paper by N.A. Tornqvist and M. Roos published in Phys. Rev. Lett. 76, 1575 (1996).
Standard vs. Generalized Chiral Perturbation Theory : the Chell-Olsson test
M. R. Pennington, J. Portoles
A way of testing the predictions of Chiral Perturbation Theory against experimental data is to use dispersion relations to continue experimental information into the subthresh…
Local Boundary Conditions in Quantum Supergravity
Giampiero Esposito
When quantum supergravity is studied on manifolds with boundary, one may consider local boundary conditions which fix on the initial surface the whole primed part of tangential com…
Non-Local Boundary Conditions for Massless Spin-1/2 Fields
Giampiero Esposito
This paper studies the 1-loop approximation for a massless spin-1/2 field on a flat four-dimensional Euclidean background bounded by two concentric 3-spheres, when non-local bounda…
Gravitational Waveguides in Cosmology
Salvatore Capozziello, Ruggiero de Ritis, Vladimir Mank'o +2
We discuss the possibility that, besides the usual gravitational lensing, there may exist a sort of gravitational waveguiding in cosmology which could explain some anomalous phenom…