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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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34 papers · 1 filter
BRS symmetry from renormalization group flow
M. Bonini, M. D'Attanasio, G. Marchesini
By using the exact renormalization group formulation we prove perturbatively the Slavnov-Taylor (ST) identities in SU(2) Yang-Mills theory. This results from two properties: {\it l…
QCD coherence in the structure function and associated distributions at small
Giuseppe Marchesini
We recall the origin of angular ordering of soft parton emission in the region of small and show that this coherent structure can be detected in associated distributions. For s…
A Matrix Model for Random Surfaces with Dynamical Holes
G. M. Cicuta, L. Molinari, E. Montaldi +1
A matrix model to describe dynamical loops on random planar graphs is analyzed. It has similarities with a model studied by Kazakov, few years ago, and the O(n) model by Kostov and…
Direct Instanton Effects in Current-Current Correlators
Paolo Nason, Matteo Palassini
We compute the effect of small-size instantons on the coefficient function of the chiral condensate in the operator product expansion of current-current correlators. Furthermore, w…
Chiral invariance and lattice fermions with minimal doubling
Mario Pernici
A few years ago some attention has been given to a fermionic action on the lattice, with a Wilson-like term which is chirally invariant but breaks the hypercubic space-time lattice…
BRS symmetry for Yang-Mills theory with exact renormalization group
M. Bonini, M. D'Attanasio, G. Marchesini
In the exact renormalization group (RG) flow in the infrared cutoff one needs boundary conditions. In a previous paper on Yang-Mills theory we proposed to use the nine…
The Pomeron in QCD
Giuliano Preparata, Philip G. Ratcliffe
In the framework of Anisotropic Chromodynamics, a non-perturbative realization of QCD, we develop the Low-Nussinov picture of the Pomeron. In this approach all the usual problems o…
Higher Twist, Polarised Structure Functions and the Bjorken System of Equations
Philip G. Ratcliffe
We discuss the present situation with regard to polarised nucleon structure function measurements. In particular we examine the status of the Bjorken sum rule in the light of the r…
Lambda(1405) in the Bound State Soliton Model
C. L. Schat, N. N. Scoccola, C. Gobbi
The strong and electromagnetic properties of the Lambda(1405) hyperon are studied in the framework of the bound state soliton model. We explicitly evaluate the strong coupling cons…
Three-dimensional BF Theories and the Alexander-Conway Invariant of Knots
A. S. Cattaneo, P. Cotta-Ramusino, M. Martellini
We study 3-dimensional BF theories and define observables related to knots and links. The quantum expectation values of these observables give the coefficients of the Alexander-Con…
Topological Correlation Functions in Minkowski Spacetime
S. Penati, D. Zanon
We consider a class of non-unitary Toda theories based on the Lie superalgebras in two-dimensional Minkowski spacetime, which can be twisted into a topological secto…
Unified Approach to Thermodynamic Bethe Ansatz and Finite Size Corrections for Lattice Models and Field Theories
C. Destri, H. J. de Vega
We present a unified approach to the Thermodynamic Bethe Ansatz (TBA) for magnetic chains and field theories that includes the finite size (and zero temperature) calculations for l…
Constrained Topological Field Theory
Damiano Anselmi, Pietro Fre', Luciano Girardello +1
We derive a model of constrained topological gravity, a theory recently introduced by us through the twist of N=2 Liouville theory, starting from the general BRST algebra and impos…
Eigenvalues of the Weyl operator as observables of general relativity
Roberto De Pietri, Carlo Rovelli
We consider the eigenvalues of the three-dimensional Weyl operator defined in terms of the (Euclidean) Ashtekar variables, and we study their dependence on the gravitational field.…
1D-Disordered Conductor with Loops Immersed in a Magnetic Field
A. S. Cattaneo, A. Gamba, I. V. Kolokolov +1
We investigate the conductance of a 1-D disordered conducting loop with two contacts, immersed in a magnetic flux. We show the appearance in this model of the Al'tshuler-Aronov-Spi…
From N=2 Supergravity to Constrained Moduli Spaces
D. Anselmi, P. Fre', L. Girardello +1
In this talk we review some results concerning a mechanism for reducing the moduli space of a topological field theory to a proper submanifold of the ordinary moduli space. Such me…
Four Loop Result in Lattice Gauge Theory by a Stochastic Method: Lattice Correction to the Condensate
F. Di Renzo, G. Marchesini, P. Marenzoni +1
We describe a stochastic technique which allows one to compute numerically the coefficients of the weak coupling perturbative expansion of any observable in Lattice Gauge Theory. T…
Statistics of the One-Electron Current in a One-Dimensional Mesoscopic Ring at Arbitrary Magnetic Fields
A. S. Cattaneo, A. Gamba, I. V. Kolokolov
The set of moments and the distribution function of the one-electron current in a one-dimensional disordered ring with arbitrary magnetic flux are calculated.
Standard and Generalized Newtonian Gravities as ``Gauge'' Theories of the Extended Galilei Group - II: Dynamical Three-Space Theories
R. De Pietri, L. Lusanna, M. Pauri
In a preceding paper we developed a reformulation of Newtonian gravitation as a {\it gauge} theory of the extended Galilei group. In the present one we derive two true generalizati…
Standard and Generalized Newtonian Gravities as ``Gauge'' Theories of the Extended Galilei Group - I: The Standard Theory
R. De Pietri, L. Lusanna, M. Pauri
Newton's standard theory of gravitation is reformulated as a {\it gauge} theory of the {\it extended} Galilei Group. The Action principle is obtained by matching the {\it gauge} te…
Neutrino Capture Cross Sections for Ar-40 and beta-decay of Ti-40
W. E. Ormand, P. M. Pizzochero, P. F. Bortignon +1
Shell-model calculations of solar neutrino absorption cross sections for Ar, the proposed component of the ICARUS detector, are presented. It is found that low-lying Gamow-T…
Escape and Spreading Properties of Charge-Exchange Resonances in Bi 208
G. Colo`, N. Van Giai, P. F. Bortignon +1
The properties of charge-exchange excitations of Pb with , i.e., the isobaric analog and Gamow-Teller resonances, are studied within a self-consistent model maki…
Deviations from Hierarchical Clustering in Real and Redshift Space
S. Ghigna, S. A. Bonometto, L. Guzzo +4
We discuss the effects of redshift--space distortions on the estimate of high order galaxy correlation functions. We use both the Perseus--Pisces redshift survey and the results of…
Constrained Topological Gravity from Twisted N=2 Liouville Theory
D. Anselmi, P. Fre', L. Girardello +1
In this paper we show that there exists a new class of topological field theories, whose correlators are intersection numbers of cohomology classes in a constrained moduli space. O…