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35 papers · 1 filter
Correlation functions and momentum distribution of one-dimensional Bose systems
G. E. Astrakharchik, S. Giorgini
The ground-state correlation properties of a one-dimensional Bose system described by the Lieb-Liniger Hamiltonian are investigated by using exact quantum Monte Carlo techniques. T…
Dynamic structure factor of a Bose Einstein condensate in a 1D optical lattice
C. Menotti, M. Kraemer, L. Pitaevskii +1
We study the effect of a one dimensional periodic potential on the dynamic structure factor of an interacting Bose Einstein condensate at zero temperature. We show that, due to pho…
Dispersion relations in real and virtual Compton scattering
D. Drechsel, B. Pasquini, M. Vanderhaeghen
A unified presentation is given on the use of dispersion relations in the real and virtual Compton scattering processes off the nucleon. The way in which dispersion relations for C…
Fermi 1D quantum gas: Luttinger liquid approach and spin-charge separation
A. Recati, P. O. Fedichev, W. Zwerger +1
We discuss the properties of quasi-1D quantum gases of fermionic atoms using the Luttinger liquid theory, including the presence of an optical lattice and of a longitudinal trappin…
Explicit Kundt type II and N solutions as gravitational waves in various type D and O universes
Jiri Podolsky, Marcello Ortaggio
A particular yet large class of non-diverging solutions which admits a cosmological constant, electromagnetic field, pure radiation and/or general non-null matter component is expl…
Vortex liquids and vortex quantum Hall states in trapped rotating Bose gases
Uwe R. Fischer, Petr O. Fedichev, Alessio Recati
We discuss the feasibility of quantum Hall states of vortices in trapped low-density two-dimensional Bose gases with large particle interactions. For interaction strengths larger t…
The interplay of the polar decomposition theorem and the Lorentz group
Valter Moretti
It is shown that the polar decomposition theorem of operators in (real) Hilbert spaces gives rise to the known decomposition in boost and spatial rotation part of any matrix of the…
Macroscopic dynamics of a Bose-Einstein condensate containing a vortex lattice
Marco Cozzini, Sandro Stringari
Starting from the equations of rotational hydrodynamics we study the macroscopic behaviour of a trapped Bose-Einstein condensate containing a large number of vortices. The stationa…
On the structures in the afterglow peak emission of gamma ray bursts
R. Ruffini, C. L. Bianco, P. Chardonnet +2
Using GRB 991216 as a prototype, it is shown that the intensity substructures observed in what is generally called the "prompt emission" in gamma ray bursts (GRBs) do originate in…
Critical temperature of Bose-Einstein condensation in trapped atomic Bose-Fermi mixtures
Alexander P. Albus, Stefano Giorgini, Fabrizio Illuminati +1
We calculate the shift in the critical temperature of Bose-Einstein condensation for a dilute Bose-Fermi mixture confined by a harmonic potential to lowest order in both the Bose-B…
Scissors mode of a rotating Bose-Einstein condensate
Marco Cozzini, Sandro Stringari, Vincent Bretin +2
A scissors mode of a rotating Bose-Einstein condensate is investigated both theoretically and experimentally. The condensate is confined in an axi-symmetric harmonic trap, superimp…
Impulsive waves in electrovac direct product spacetimes with Lambda
Marcello Ortaggio, Jiri Podolsky
A complete family of non-expanding impulsive waves in spacetimes which are the direct product of two 2-spaces of constant curvature is presented. In addition to previously investig…
Compensated Current Injection circuit, theory and applications
Giorgio Fontana
This paper presents a detailed description, analysis and example of practical application of a wide frequency band voltage-to-current converter. The converter is characterized by a…
Electronic spin precession in semiconductor quantum dots with spin-orbit coupling
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra +1
The electronic spin precession in semiconductor dots is strongly affected by the spin-orbit coupling. We present a theory of the electronic spin resonance at low magnetic fields th…
Landau damping of transverse quadrupole oscillations of an elongated Bose-Einstein condensate
M. Guilleumas, L. P. Pitaevskii
We study the interaction between low-lying transverse collective oscillations and thermal excitations of an elongated Bose-Einstein condensate by means of perturbation theory. We c…
Expansion of an interacting Fermi gas
C. Menotti, P. Pedri, S. Stringari
We study the expansion of a dilute ultracold sample of fermions initially trapped in a anisotropic harmonic trap. The expansion of the cloud provides valuable information about the…
Quantum Monte Carlo study of the 3D-1D crossover for a trapped Bose gas
G. E. Astrakharchik, S. Giorgini
We investigate the cross-over from three to one dimension in a Bose gas confined in highly anisotropic traps. By using Quantum Monte-Carlo techniques, we solve the many-body Schrod…
Aspects of hidden and manifest SL(2,R) symmetry in 2D near-horizon black-hole background
V. Moretti, N. Pinamonti
The invariance under unitary representations of the conformal group SL(2,R) of a quantum particle is rigorously investigated in two-dimensional spacetimes containing Killing horizo…
Ground-state properties of a dilute Bose-Fermi mixture
L. Viverit, S. Giorgini
We investigate the properties of a dilute boson-fermion mixture at zero temperature. The ground-state energy of the system is calculated to second order in the Bose-Fermi coupling…
Spin-charge separation in ultra-cold quantum gases
A. Recati, P. O. Fedichev, W. Zwerger +1
We investigate the physical properties of quasi-1D quantum gases of fermion atoms confined in harmonic traps. Using the fact that for a homogeneous gas, the low energy properties a…
Evidence of short time dynamical correlations in simple liquids
T. Scopigno, G. Ruocco, F. Sette +1
We report a molecular dynamics (MD) study of the collective dynamics of a simple monatomic liquid -interacting through a two body potential that mimics that of lithium- across the…
Linking generalized parton distributions to constituent quark models
S. Boffi, B. Pasquini, M. Traini
The link between the nucleon generalized parton distributions and the non-diagonal one-body density matrix in momentum space is studied. Attention is focussed on the region where q…
Spin switching in semiconductor quantum dots through spin-orbit coupling
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra +1
The spin-orbit coupling influences the total spin of semiconductor quantum dots. We analyze the theoretical prediction for the combined effects of spin-orbit coupling, weak vertica…
Morphisms of Projective Varieties from the viewpoint of Minimal Model Theory
M. Andreatta, M. Mella
In this Lecture Notes we present, in a sufficiently self contained way, our contributions and interests in the field of Minimal Model Theory. We study Fano-Mori spaces, both from t…