Noncommutative geometry inspired wormholes and dirty black holes (2009)
Nicolini, Piero, Spallucci, Euro
We provide new exact solutions of the Einstein equations which generalize the noncommutative geometry inspired Schwarzschild metric, previously obtained by the authors. We consider here more general...
From screening to confinement in a Higgs-like model (2009)
Gaete, Patricio, Spallucci, Euro
We investigate a recently proposed Higgs-like model (arXiv:0811.4423 [hep-th]), in the framework of a gauge-invariant but path-dependent variables formalism. We compute the static potential between...
A note on unparticle in lower dimensions (2008)
Gaete, Patricio, Spallucci, Euro
Using the gauge-invariant but path-dependent variables formalism, we examine the effect of the space-time dimensionality on a physical observable in the unparticle scenario. We explicitly show that...
Non-commutative geometry inspired higher-dimensional charged, black holes (2008)
Spallucci, Euro, Smailagic, Anais, Nicolini, Piero
We obtain a new, exact, solution of the Einstein's equation in higher dimensions. The source is given by a static spherically symmetric, Gaussian distribution of mass and charge. De-localization of...
Un-particle Effective Action (2008)
Gaete, Patricio, Spallucci, Euro
We study un-particle dynamics in the framework of standard quantum field theory. We obtain the Feynman propagator by supplementing standard quantum field theory definitions with integration over the...
Remarks on confinement driven by axion-like particles in Yang-Mills theories (2007)
Gaete, Patricio, Spallucci, Euro
Features of screening and confinement are studied for a non-Abelian gauge theory with a mixture of pseudoscalar and scalar coupling, in the case where a constant chromo-electric, or chromo-magnetic,...
Confinement from gluodynamics in curved space-time (2007)
Gaete, Patricio, Spallucci, Euro
We determine the static potential for a heavy quark-antiquark pair from gluodynamics in curved space-time. Our calculation is done within the framework of the gauge-invariant, path-dependent,...
Static potential from spontaneous breaking of scale symmetry (2007)
Gaete, Patricio, Guendelman, Eduardo, Spallucci, Euro
We determine the static potential for a heavy quark-antiquark pair from the spontaneous symmetry breaking of scale invariance in a non-Abelian gauge theory. Our calculation is done within the...
Noncommutative geometry inspired charged black holes (2006)
Ansoldi, Stefano, Nicolini, Piero, Smailagic, Anais, Spallucci, Euro
We find a new, non-commutative geometry inspired, solution of the coupled Einstein-Maxwell field equations describing a variety of charged, self-gravitating objects, including extremal and...
Confinement from constant field condensates (2006)
Gaete, Patricio, Guendelman, Eduardo, Spallucci, Euro
For a $(2+1)$-dimensional reformulated SU(2) Yang-Mills theory, we compute the interaction potential within the framework of the gauge-invariant but path-dependent variables formalism. This...
Trace Anomaly in Quantum Spacetime Manifold (2006)
Spallucci, Euro, Smailagic, Anais, Nicolini, Piero
In this paper we investigate the trace anomaly in a spacetime where single events are de-localized as a consequence of short distance quantum coordinate fluctuations. We obtain a modified form of...
Confinement effects from interacting chromo-magnetic and axion fields (2005)
Gaete, Patricio, Spallucci, Euro
We study a non-Abelian gauge theory with a pseudo scalar coupling \phi \epsilon ^{\mu \nu \alpha \beta} F_{\mu \nu}^a F_{\alpha \beta}^a in the case where a constant chromo-electric, or...
TeV Mini Black Hole Decay at Future Colliders (2005)
Casanova, Alex, Spallucci, Euro
It is generally believed that mini black holes decay by emitting elementary particles with a black body energy spectrum. The original calculation lead to the conclusion that about the 90% of the...
Noncommutative geometry inspired Schwarzschild black hole (2005)
Nicolini, Piero, Smailagic, Anais, Spallucci, Euro
We investigate the behavior of a noncommutative radiating Schwarzschild black hole. It is shown that coordinate noncommutativity cures usual problems encountered in the description of the terminal...
The role of a dynamical measure and dynamical tension in brane creation and growth (2005)
Ansoldi, Stefano, Guendelman, Eduardo I., Spallucci, Euro
The use of a non-Riemannian measure of integration in the action of strings and branes allows the possibility of dynamical tension. In particular, lower dimensional objects living in the string/brane...
Zero-point length from string fluctuations (2005)
Fontanini, Michele, Spallucci, Euro, Padmanabhan, T.
One of the leading candidates for quantum gravity, viz. string theory, has the following features incorporated in it. (i) The full spacetime is higher dimensional, with (possibly) compact...
Zero-point length, extra-dimensions and string T-duality (2005)
Spallucci, Euro, Fontanini, Michele
In this paper, we are going to put in a single consistent framework apparently unrelated pieces of information, i.e. zero-point length, extra-dimensions, string T-duality. More in details we are...
The fate of radiating black holes in noncommutative geometry (2005)
Nicolini, Piero, Smailagic, Anais, Spallucci, Euro
We investigate the behavior of a radiating Schwarzschild black hole toy-model in a 2D noncommutative spacetime. It is shown that coordinate noncommutativity leads to: i) the existence of a minimal...
Lorentz invariance and unitarity in UV finite NCQFT (2004)
Smailagic, Anais, Spallucci, Euro
Ultraviolet finite quantum field theory on even dimensional noncommutative spacetime is formulated using coordinate coherent states. 2d spacetime is foliated into families of orthogonal, non...
UV divergence-free QFT on noncommutative plane (2003)
Smailagic, Anais, Spallucci, Euro
We formulate Noncommutative Qauntum Field Theory in terms of fields defined as mean value over coherent states of the noncommutative plane. No *-product is needed in this formulation and...
Feynman Path Integral on the Noncommutative Plane (2003)
Smailagic, Anais, Spallucci, Euro
We formulate Feynman path integral on a non commutative plane using coherent states. The propagator for a free particle exhibits UV cut-off induced by the parameter of non commutativity.
Real and Imaginary Mass Generation in the Presence of External Fields and Axions (2002)
Ansoldi, Stefano, Guendelman, Eduardo I., Spallucci, Euro
Small fluctuations around a constant electric or constant magnetic field F are analyzed in a theory with pseudo scalar [phi] with a coupling g[phi]F~F. It is found that a magnetic external field...
Fuzzy dimensions and Planck's Uncertainty Principle for p-branes (2002)
Aurilia, Antonio, Ansoldi, Stefano, Spallucci, Euro
The explicit form of the quantum propagator of a bosonic p-brane, previously obtained by the authors in the quenched-minisuperspace approximation, suggests the possibility of a novel, unified,...
Kac-Moody structure of chiral gravity in the light-cone gauge (1993)
Smailagic, A., Spallucci, Euro
We study the residual symmetry $SL(2,R)\otimes U(1)$ of the chiral gravity in the light-cone gauge. Quantum gravitational effects renormalize the Kac-Moody central charge and introduce, through the...
Induced quantum gravity from heat kernel expansion (1982)
Denardo, Gallieno, Spallucci, Euro
The asymptotic expansion of the heat kernel is employed to derive the Einstein action from the matter effective action. The advantages of this approach are discussed. We point out some problems...
Curvature effects on the quartic self-coupling constant (1982)
Denardo, Gallieno, Spallucci, Euro
We study the curvature dependence of the quartic self-coupling constant in a λØ 4 theory in the background of e static closed Einstein universe. Contrary of what happens in flat space-time at...
Curvature and symmetry breaking: an induced action approach (1982)
Denardo, Gallieno, Spallucci, Euro
We recover the general form of the one—loop effective potential for a λØ4, theory, non—minimally coupled to a constant curvature background geometry, in the low energy limit, i.e. for small...