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
- Centre National de la Recherche ScientifiqueFR3.7k papers
- Istituto Nazionale di Fisica Nucleare, Sezione di Roma IIT3.4k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR3.3k papers
- Istituto Nazionale di Fisica Nucleare, Sezione di GenovaIT3.1k papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR3.1k papers
- Istituto Nazionale di Fisica Nucleare, Sezione di PisaIT3k papers
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiIT2.9k papers
- Rutherford Appleton LaboratoryGB2.8k papers
- Istituto Nazionale di Fisica Nucleare, Sezione di BolognaIT2.8k papers
- Sapienza University of RomeIT2.7k papers
- The Ohio State UniversityUS2.7k papers
16 papers · 2 filters
Noncommutative Geometry and Spacetime Gauge Symmetries of String Theory
Fedele Lizzi, Richard J. Szabo
We illustrate the various ways in which the algebraic framework of noncommutative geometry naturally captures the short-distance spacetime properties of string theory. We describe…
Sress-Tensor for parafermions from the generalized Frenkel-Kac construction of affine algebra
Vincenzo Marotta
I discuss a realization of stress-tensor for parafermion theories following the generalized Frenkel-Kac construction for higher level Kac-Moody algebras. All the fields are obtaine…
Matrix Sigma-models for Multi D-brane Dynamics
F. Lizzi, N. E. Mavromatos, R. J. Szabo
We describe a dynamical worldsheet origin for the Lagrangian describing the low-energy dynamics of a system of parallel D-branes. We show how matrix-valued collective coordinate fi…
Gauge theories on manifolds with boundary
Ivan G. Avramidi, Giampiero Esposito
The boundary-value problem for Laplace-type operators acting on smooth sections of a vector bundle over a compact Riemannian manifold with generalized local boundary conditions inc…
Electric-magnetic Duality in Noncommutative Geometry
Fedele Lizzi, Richard J. Szabo
The structure of S-duality in U(1) gauge theory on a 4-manifold M is examined using the formalism of noncommutative geometry. A noncommutative space is constructed from the algebra…
Lack of strong ellipticity in Euclidean quantum gravity
Ivan G. Avramidi, Giampiero Esposito
Recent work in Euclidean quantum gravity has studied boundary conditions which are completely invariant under infinitesimal diffeomorphisms on metric perturbations. On using the de…
Hidden Quantum Group Structure in Einstein's General Relativity
G. Bimonte, R. Musto, A. Stern +1
A new formal scheme is presented in which Einstein's classical theory of General Relativity appears as the common, invariant sector of a one-parameter family of different theories.…
On the Zero-Point Energy of a Conducting Spherical Shell
Giampiero Esposito, Alexander Yu. Kamenshchik, Klaus Kirsten
The zero-point energy of a conducting spherical shell is evaluated by imposing boundary conditions on the potential, and on the ghost fields. The scheme requires that temporal and…
2+1 Einstein Gravity as a Deformed Chern-Simons Theory
G. Bimonte, R. Musto, A. Stern +1
The usual description of 2+1 dimensional Einstein gravity as a Chern-Simons (CS) theory is extended to a one parameter family of descriptions of 2+1 Einstein gravity. This is done…
Deformed Chern-Simons Theories
G. Bimonte, R. Musto, A. Stern +1
We construct a Chern-Simons action for q-deformed gauge theory which is a simple and straightforward generalization of the usual one. Space-time continues to be an ordinary (commut…
Mirror Fermions in Noncommutative Geometry
F. Lizzi, G. Mangano, G. Miele +1
In a recent paper we pointed out the presence of extra fermionic degrees of freedom in a chiral gauge theory based on Connes Noncommutative Geometry. Here we propose a mechanism wh…
Finite Temperature Effective Potential for Gauge Models in de Sitter Space
Lara De Nardo, Dmitri V. Fursaev, Gennaro Miele
The one-loop effective potential for gauge models in static de Sitter space at finite temperatures is computed by means of the --function method. We found a simple relation whic…
W_k structure of generalized Frenkel-Kac construction for SU(2)-level k Kac-Moody algebra
Vincenzo Marotta
W_k structure underlying the tensverse realization of SU(2) at level k is analyzed. Extension of the equivalence existing between covariant and light-cone gauge realization of affi…
A nonperturbative form of the spectral action principle in noncommutative geometry
H. Figueroa, J. M. Gracia-Bondia, F. Lizzi +1
Using the formalism of superconnections, we show the existence of a bosonic action functional for the standard K-cycle in noncommutative geometry, giving rise, through the spectral…
Noncovariant Gauges in Simple Supergravity
Giampiero Esposito, Giuseppe Pollifrone
A gauge-averaging functional of the axial type is studied for simple supergravity at one loop about flat Euclidean four-space bounded by a three-sphere, or two concentric three-sph…
Heat-Kernel Asymptotics with Generalized Boundary Conditions
Ivan G. Avramidi, G. Esposito
The quantization of gauge fields and gravitation on manifolds with boundary makes it necessary to study boundary conditions which involve both normal and tangential derivatives of…