arXiv subjects

O. Espinosa

Publications and source records attributed to O. Espinosa.

3 recordsLinked to original sources

arXiv2001

Nonrelativistic Fermions in Magnetic Fields: a Quantum Field Theory Approach

The statistical mechanics of nonrelativistic fermions in a constant magnetic field is considered from the quantum field theory point of view. The fermionic determinant is computed using a general procedure that contains all possible regularizations. The nonrelativistic grand-potential can be expressed in terms polylogarithm functions, whereas the partition function in 2+1 dimensions and vanishing chemical potential can be compactly written in terms of the Dedekind eta function. The strong and weak magnetic fields limits are easily studied in the latter case by using the duality properties of the Dedekind function.

hep-th↗

arXiv1997

3-dimensional Rules for Finite-Temperature Loops

We present simple diagrammatic rules to write down Euclidean n-point functions at finite temperature directly in terms of 3-dimensional momentum integrals, without ever performing a single Matsubara sum. The rules can be understood as describing the interaction of the external particles with those of the thermal bath.

hep-th↗

arXiv1997

Number of Electrons per Collision as a Quark-Gluon Plasma Signal

We investigate whether the total number of electrons per collision, as a function of beam energy, is a potential quark-gluon-plasma (QGP) signature. At high beam energies, we find that, after experimental removal of the noise induced by Dalitz decays, the number of produced electrons is increased many times fold from the existence of the QGP. The robustness of the potential signal to differing theoretical assumptions makes it an attractive experimental parameter.

hep-ph↗