
L. Accardi,  30 Jan.  10 Feb.; 
R. Alicki,  30 Jan.  18 Feb.; 
H. Araki,  30 Jan.  31 March; 
J. Avron;  30 Jan.  6 Feb.; 
J. Barata,  30 Jan.  12 Feb.; 
J. Bellissard,  28 Jan.  7 Feb.; 
F. Benatti,  31 Jan.  6 Feb.; 
P. Blanchard,  6.Feb.  13.Feb.; 
J. Clark,  30 Jan.  05. Feb.; 
H. Cornean,  10 March  20 March; 
J. Derezinski,  30 Jan.12 Feb., 1518 Feb., 28 Feb.4 March, 829 March, 4 April6 May, 928 May; 
W. De Roeck,  31 Jan.  9 Feb.; 
A. Elgart,  20 Jan.  3 Feb.; 
F. Fagnola,  30 Jan.  6 Feb.; 
R. Floreanini,  29 Jan.  4 Feb.; 
J. Froehlich,  14 March  18 March; 
R. Fruboes,  13 March  18 March; 
C. Gerard  14  18 March 
S. Golenia,  13 April  15 April; 
G. M. Graf,  27 Jan.  11 Feb., 7  18 March; 
M. Griesemer,  6  26 March; 
H. Grundling,  2  9 March; 
C. Hainzl,  1  20 March; 
M. Hellmich,  6  13 Feb.; 
M. Hirokawa,  7  18. March; 
F. Hiroshima,  7  18. March; 
K. Ito,  7  17 March; 
V. Jaksic,  13  19 March; 
C. Jaekel,  28 Feb.  19 March; 
G. JonaLasinio,  13  24 March; 
I. Klich,  30 Jan.  10 Feb.; 
A. Kossakowski,  13  19 March; 
J. Lorinczi,  6  13 March; 
W.A. Majewski,  28 Jan.  12 Feb.; 
T. Matsui,  9 March  19 March; 
K. Meissner,  14  24 Apr.; 
M. Merkli,  4  25 March; 
H. Moriya,  30 Jan  9 Feb.; 
K. Netocny,  6  18 March; 
H. Narnhofer,  local person; 
R. Olkiewicz,  30 Jan  12 Feb.; 
G. Panati,  30 Jan.  9 Feb; 
Y. Pautrat,  20 Jan.  4 Feb.; 
C. A. Pillet,  13  18 March; 
R. Roschin,  1  31 March; 
D. Ruelle,  30 Jan.  7 Feb.; 
J. Schenker,  30.Jan  5. Feb. and 14  18 March; 
B. Schlein,  20 Jan.  3 Feb.; 
R. Seiringer,  23  31 Jan. and 11  20 March; 
G. Sewell,  10  31 March; 
H. Siedentop,  12 March  19 March; 
H. Skibsted,  7. March  19 March; 
J. P. Solovej,  12 March  18 March; 
M. Travaglia,  31 Jan  8 Feb.; 
J. Yngvason,  local person; 
H. Zenk,  13  18 March; 
J. SchachMoeller*,  around 2nd workshop 
The Thermodynamic Pressure of a Dilute Fermi Gas
Abstract: We consider a gas of fermions with nonzero spin at temperature $T$ and chemical potential $\mu$. We show that if the range of the interparticle interaction is small compared to the mean particle distance, the thermodynamic pressure differs to leading order from the corresponding expression for noninteracting particles by a term proportional to the scattering length of the interparticle interaction. This is true for any repulsive interaction, including hard cores. The result is uniform in the temperature as long as $T$ is of the same order as the Fermi temperature, or smaller.
Positive quantum maps, states and entanglement
Some stability results for quasiperiodically perturbed Hill's equations
Abstract: We show that quasiperiodic solutions of Hill's equations under quasiperiodic perturbations remain quasiperiodic if the strength of the perturbation belongs to a Cantor set of finite measure on a sufficiently small interval. One method is based on a resummation of formal Lindstedt series obtained as a solution of a generalized Ricatti equation. This is a joint work with G. Gentile (U, Roma III) and D. A. Cortez (IFUSP).
Decoherence in infinite quantum spin systems
Quadratic commutation relations, Meixner classes and quadratic KMS states
The emergence of the non crossing diagrams and of the QED. Hilbert module in the stochastic limit of nonrelativistic QED.
Nelson's model: Ground state properties and infrared behaviour
Renormalized powers of boson fields
We define and study "powers" of creation and annihilation operators in boson Fock space by applying the standard renormalization procedure consists in introducing a cutoff and then trying to remove it by a limiting procedure. We show that, independently of the choice of the cutoff, one has the following symbolic relations: $(a^\dag_k)^{m} \to b^\dag_{m,k}$, $(a_k)^{m} \to b_{m,k}$, $(a^\dag_k)^{mn} (a_k)^n \to 0$, where for each $m$ $b_{m,k}$, $b^\dag_{m,k}$ are new independent boson fields, $(a^\dag_k)^{m}$ is some reasonably defined sequence of (welldefined) operators in original boson Fock space, and the limit is understood in the sense of correlators. This oversimplified result can be considered as one more motivation for a new renormalization technique was introduced based on the idea of renormalizing a closed set of commutation relations and then finding a nontrivial representation for them.
The Faraday effect revisited
We revisit the theory of the Faraday effect in solids, which amounts for the computation of the conductivity tensor of noninteracting electrons, subjected to a periodic scalar potential and a constant magnetic field. Using the recently developed gauge invariant magnetic perturbation theory, we obtain a representation of the conductivity tensor which is free of the usual divergencies caused by the linear growth of the magnetic vector potential. An exact formula in the case of free electrons is also derived.
Scattering for longrange magnetic fields
Twodimensional magnetic systems with the field assumed to be homogeneous of degree $1$ (to leading order) have a rich dynamical structure. We give an account of various recent results obtained with Horia Cornean and Ira Herbst. In particular if the field never vanishes for large $x$ there exists classically at high enough energies a globally attracting Lagrangian manifold given by logarithmic spirals. Based on this fact, we construct an approximate dynamics in quantum mechanics and prove asymptotic completeness. If the field has zeros all of them define classical channels. Only the stable ones exist in quantum mechanics, and for each of them we construct an approximate dynamics. Under certain conditions we prove completeness. For certain energies it may happen that the channel of logarithmic spirals and the channels of attracting halflines coexist. There are also examples where none of them exist.
"Operator algebras and their applications in quantum physics"
during the period March 1  May 30.