Browsing SISSA Preprints by Issue Date

Now showing items 1-20 of 479

Some classes of inverse spectral problems for quantum graphs

Olivieri, Marco; Finco, D. (SISSA, 30-08-2016)

Inverse spectral problems for quantum graphs are analyzed. Under hypothesis of rational independence of lengths of edges it is possible, thanks to trace formulas, to reconstruct every information of compact and not compact ...
About quantization of gravity

Furlan, Giuseppe; de Alfaro, Vittorio; Fubini, Sergio (SISSA Library, 1984)
Differential geometry of moduli spaces and its applications to soliton equations and to topological conformal field theory

Dubrovin, Boris (Scuola Normale Superiore di Pisa, 1991-11)

We construct flat Riemannian metrics on moduli spaces of algebraic curves with marked meromorphic function. This gives a new class of exact algebraic-geometry solutions to certain non-linear equations in terms of functions ...
Canonical and pertubative quantum gravity

Esposito, Giampiero (1993)

After a review of Dirac's theory of iconstrained Hamiltonian systems and their quantization, canonical quantum gravity is studied relying on the Arnowitt-Deser-Misner formalism. First-class constraints of the theory ...
Liouville and Toda field theories on Riemann surfaces

Aldrovandi, E.; Bonora, L. (1993-03-10)

We study the Liouville theory on a Riemann surface of genus g by means of their associated Drinfeld–Sokolov linear systems. We discuss the cohomolog ical properties of the monodromies of these systems. We identify the ...
Algebraic structure of Lorentz and diffeomorphism anomalies

Werneck de Oliveira, M.; Sorella, S.P. (1993-04-03)

The Wess-Zumino consistency conditions for Lorentz and diffeomor phism anomalies are discussed by introducing an operator δ whichallows to decompose the exterior space-time derivative as a BRS com mutator.
Functional change of variables in the Wheeler-De Witt equation

Cavaglià, Marco (SISSA, 1993-04-30)

I present a new way to solve the Wheeler-de Witt equation using the invariance of the classical lagrangian under reparametrization. This property allows one to introduce an arbitrary function for each degree of freedom ...
Subdivision Analysis of Topological $Z_{p}$ Lattice Gauge Theory

Birmingham, Danny; Rakowski, Mark (SISSA, 1993-06-25)

We analyze the subdivision properties of certain lattice gauge theories for the discrete abelian groups $Z_{p}$, in four dimensions. In these particular models we show that the Boltzmann weights are invariant under all ...
The effective potential for the conformal factor in the standard model and beyond

Percacci, Roberto (SISSA, 1993-08-07)

There is a general mechanism by which certain matter fields coupled to gravity can generate a nontrivial effective potential for the conformal factor of the metric. It is based on a nonstandard regularization method, ...
A Unique Mass Function from Galaxies to Clusters ?

Giuricin, Giuliano; Mardirossian, Fabio; Mezzetti, Marino; Persic, Massimo; Salucci, Paolo (SISSA, 1993-08-11)

We present an observational mass function ranging from galaxies to massive galaxy clusters, derived from direct dynamical mass estimates. Our mass function shows, in the low-mass range of galaxies and groups, a behaviour ...
Towards the Classification of Exactly Solvable Feynman Path Integrals: $δ$-Function Perturbations and Boundary-Problems as Miscellaneous Solvable Models

Grosche, Christian (SISSA, 1993-08-17)

In this contribution I present further results on steps towards a Table of Feynman Path Integrals. Whereas the usual path integral solutions of the harmonic oscillator (Gaussian path integrals), of the radial harmonic ...
Leptonic Decay Constants of Charm and Beauty Mesons in QCD: An Update

Dominguez, C. A. (SISSA, 1993-09-14)

An update is given of the determination of leptonic decay constants of charm and beauty mesons in the framework of relativistic Hilbert moments and Laplace transform QCD sum rules.
Correlation functions of two-matrix models

Bonora, Loriano; Xiong, C. S. (SISSA, 1993-11-16)

We show how to calculate correlation functions of two matrix models. Our method consists in making full use of the integrable hierarchies and their reductions, which were shown in previous papers to naturally appear ...
Algebraic-geometrical Darboux coordinates in R-matrix formalism

Diener, Paola; Dubrovin, Boris (SISSA, 1994)
Recurrent procedure for the determination of the free energy ε^2 expansion in the topological string theory

Dubrovin, Boris; Maltsev, Andrei Ya A (SISSA, 1999-03-30)

We present here the iteration procedure for the determination of free energy ǫ2-expansion using the theory of KdV - type equations. In our approach we use the conservation laws for KdV - type equations depending explicitly ...
Poisson Pencils, Integrability, and Separation of Variables

Falqui, Gregorio (SISSA, 2003)

In this paper we will review a recently introduced method for solving the Hamilton-Jacobi equations by the method of Separation of Variables. This method is based on the notion of pencil of Poisson brackets and on the ...
On non-perturbative extensions of anti-de-Sitter algebras

Meessen, Patrick; Peeters, Kasper; Zamaklar, Marija (SISSA, 2003)

Motivated by the study of branes in curved backgrounds, we investigate the construction of non-perturbative extensions of the super-isometry algebra osp*(8|4) of the AdS_7xS^4 background of M-theory. This algebra is not a ...
Topics in String Field Theory

Bonora, Loriano; Maccaferri, Carlo; Mamone, Davide; Salizzoni, Mario (SISSA, 2003)

This review of bosonic string field theory is concentrated on two main subjects. In the first part we revisit the construction of the three string vertex and rederive the relevant Neumann coefficients both for the matter ...
Prospects of probing $\theta_{13}$ and neutrino mass hierarchy by Supernova Neutrinos in KamLAND

Bandyopadhyay, Abhijit; Choubey, Sandhya; Goswami, Srubabati; Kar, Kamales (SISSA, 2003)

In this paper we study the physics potential of the KamLAND detector in probing neutrino oscillation parameters through observation of supernova neutrinos. In particular, we discuss the possibilities of probing the mixing ...
Singularities and Closed Timelike Curves in type IIB 1/2 BPS Geometries

Milanesi, Giuseppe; O'Loughlin, Martin (2005)

We study in detail the moduli space of solutions discovered in LLM relaxing the constraint that guarantees the absence of singularities. The solutions fall into three classes, non-singular, null-singular and time machines ...

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