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
18 papers · 2 filters
Improved Action Functionals in Non-Perturbative Quantum Gravity
Alfio Bonanno, Giampiero Esposito, Claudio Rubano
Models of gravity with variable G and Lambda have acquired greater relevance after the recent evidence in favour of the Einstein theory being non-perturbatively renormalizable in t…
A Large N expansion for Gravity
F. Canfora
A Large N expansion for gravity is proposed. The scheme is based on the splitting of the Einstein-Hilbert action into the BF topological action plus a constraint. The method also a…
New Developments in the Spectral Asymptotics of Quantum Gravity
Giampiero Esposito, Guglielmo Fucci, Alexander Yu. Kamenshchik +1
A vanishing one-loop wave function of the Universe in the limit of small three-geometry is found, on imposing diffeomorphism-invariant boundary conditions on the Euclidean 4-ball i…
Spin and Statistics on the Groenewold-Moyal Plane: Pauli-Forbidden Levels and Transitions
A. P. Balachandran, G. Mangano, A. Pinzul +1
The Groenewold-Moyal plane is the algebra A_θ(R^(d+1)) of functions on R^(d+1) with the star-product as the multiplication law, and the commutator [x_μ,x_ν] =i θ_{μν} between the c…
A Non-Singular One-Loop Wave Function of the Universe From a New Eigenvalue Asymptotics in Quantum Gravity
Giampiero Esposito, Guglielmo Fucci, Alexander Yu. Kamenshchik +1
Recent work on Euclidean quantum gravity on the four-ball has proved regularity at the origin of the generalized zeta-function built from eigenvalues for metric and ghost modes, wh…
Unified phantom cosmology: inflation, dark energy and dark matter under the same standard
S. Capozziello, S. Nojiri, S. D. Odintsov
Phantom cosmology allows to account for dynamics and matter content of the universe tracing back the evolution to the inflationary epoch, considering the transition to the non-phan…
Point-like topological defects in bilayer quantum Hall systems
Gerardo Cristofano, Vincenzo Marotta, Adele Naddeo +1
Following a suggestion given in Phys. Lett. B 571 (2003) 250, we show how a bilayer Quantum Hall system at fillings nu =m/pm+2 can exhibit a point-like topological defect in its ed…
On the Absence of Continuous Symmetries for Noncommutative 3-Spheres
Fedele Lizzi, Allen Stern, Patrizia Vitale
A large class of noncommutative spherical manifolds was obtained recently from cohomology considerations. A one-parameter family of twisted 3-spheres was discovered by Connes and L…
The beat of a fuzzy drum: fuzzy Bessel functions for the disc
Fedele Lizzi, Patrizia Vitale, Alessandro Zampini
The fuzzy disc is a matrix approximation of the functions on a disc which preserves rotational symmetry. In this paper we introduce a basis for the algebra of functions on the fuzz…
From Spinor Geometry to Complex General Relativity
Giampiero Esposito
An attempt is made of giving a self-contained (although incomplete) introduction to holomorphic ideas in general relativity, following work over the last thirty years by several au…
Variations of Casimir energy from a superconducting transition
Giuseppe Bimonte, Enrico Calloni, Giampiero Esposito +1
We consider a five-layer Casimir cavity, including a thin superconducting film. We show that when the cavity is cooled below the critical temperature for the onset of superconducti…
Spin-Hall effect with quantum group symmetry
Giovanni Landi
We construct a model of spin-Hall effect on a noncommutative 4 sphere with isospin degrees of freedom (coming from a noncommutative instanton) and invariance under a quantum orthog…
On the Gauge/Gravity Correspondence and the Open/Closed String Duality
Paolo Di Vecchia, Antonella Liccardo, Raffaele Marotta +1
In this article we review the conditions for the validity of the gauge/gravity correspondence in both supersymmetric and non-supersymmetric string models. We start by reminding wha…
A Perturbative Approach to Fuzzifying Field Theories
A. Pinzul, A. Stern
We propose a procedure for computing noncommutative corrections to the metric tensor, and apply it to scalar field theory written on coordinate patches of smooth manifolds. The pro…
Scalar perturbations in regular two-component bouncing cosmologies
V. Bozza, G. Veneziano
We consider a two-component regular cosmology bouncing from contraction to expansion, where, in order to include both scalar fields and perfect fluids as particular cases, the domi…
Spectral asymptotics of Euclidean quantum gravity with diff-invariant boundary conditions
Giampiero Esposito, Guglielmo Fucci, Alexander Yu. Kamenshchik +1
A general method is known to exist for studying Abelian and non-Abelian gauge theories, as well as Euclidean quantum gravity, at one-loop level on manifolds with boundary. In the l…
The Quantum-Classical Transition: The Fate of the Complex Structure
G Marmo, G Scolarici, A Simoni +1
According to Dirac, fundamental laws of Classical Mechanics should be recovered by means of an "appropriate limit" of Quantum Mechanics. In the same spirit it is reasonable to enqu…
The Gauge/Gravity Correspondence for Non-Supersymmetric Theories
P. Di Vecchia, A. Liccardo, R. Marotta +1
We review the string construction of the ``orientifold field theories'' and we show that for these theories the gauge/gravity correspondence is only valid for a large number of col…