4 papers
Threshold singularities in the XXZ- spin chain
A. A. Ovchinnikov
We calculate the critical exponents of the threshold singularity for the spectral density of the XXZ- spin chain at zero magnetic field for the lower threshold. We show that the co…
On the asymptotic expansion of the correlators in the XX spin chain
A. A. Ovchinnikov
Using the XX- spin chain as an example we show that in general the asymptotic expansion of the correlator at large distances is not given by the sum over the low-lying particle-hol…
Determination of the mass of the LambdaLambda dibaryon by the method of QCD sum rules
S. A. Larin, V. A. Matveev, A. A. Ovchinnikov +1
The method of QCD sum rules is used to calculate the mass of a hypothetical stable dihyperon H with the quantum numbers of two Lambda hyperons, whose existence was predicted by R.L…
The emergence of charged collective modes from a large N extrapolation of the Hubbard model
D. Foerster, A. A. Ovchinnikov
We consider a symplectic extrapolation of the Hubbard model of N fold replicated electrons and solve this model exactly in two special cases, at N=infinity in the bosonic sector an…