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81 papers · 1 filter
The Hubbard model: bosonic excitations and zero-frequency constants
Adolfo Avella, Ferdinando Mancini
A fully self-consistent calculation of the bosonic dynamics of the Hubbard model is developed within the Composite Operator Method. From one side we consider a basic set of fermion…
Neutrino current in a gravitational plane wave collision background
Donato Bini, Christian Cherubini, Gianluca Cruciani +1
The behaviour of a massless Dirac field on a general spacetime background representing two colliding gravitational plane waves is discussed in the Newman-Penrose formalism. The geo…
The charge and spin sectors of the t-t' Hubbard model
Adolfo Avella, Ferdinando Mancini
The charge and spin sectors, which are intimately coupled to the fermionic one, of the t-t' Hubbard model have been computed self-consistently within the two-pole approximation. Th…
Quantum signatures of breather-breather interactions
J. Dorignac, J. C. Eilbeck, M. Salerno +1
The spectrum of the Quantum Discrete Nonlinear Schrödinger equation on a periodic 1D lattice shows some interesting detailed band structure which may be interpreted as the quantum…
Decoherence of number states in phase-sensitive reservoirs
A. Serafini, S. De Siena, F. Illuminati
The non-unitary evolution of initial number states in general Gaussian environments is solved analytically. Decoherence in the channels is quantified by determining explicitly the…
Composite operators and algebra constraints: a formalism for highly interacting systems
Ferdinando Mancini
A formalism for the study of highly interacting electronic systems is presented. The proposed scheme is based on two key concepts: composite operators and algebra constraints. Comp…