5 papers
Once more on the equivalence between quantum phase transition phenomena in radiation-matter and magnetic systems
J. G. Brankov, N. S. Tonchev, V. A. Zagrebnov
In answer to the replies of Reslen {\it et al} [arXiv: quant-ph/0507164 (2005)], and Liberti and Zaffino [arXiv:cond-mat/0507019, (2005)], we comment once more on the temperature-d…
Comment on equivalence between quantum phase transition phenomena in radiation-matter and magnetic systems
J. G. Brankov, N. S. Tonchev, V. A. Zagrebnov
In this Comment we show that the temperature-dependent effective Hamiltonian derived by Reslen {\it et al} [Europhys. Lett., {\bf 69} (2005) 8] or that one by Liberti and Zaffino […
Finite-Size Scaling and Long-Range Interactions
N. S. Tonchev
The present review is devoted to the problems of finite-size scaling due to the presence of long-range interaction decaying at large distance as , where is the spati…
The black-body radiation in Tsallis statistics
H. Chamati, A. Ts. Djankova, N. S. Tonchev
Some results for the black-body radiation obtained in the context of the -thermostatistics are analyzed on both thermodynamical and statistical-mechanical levels. Since the ther…
Some new exact critical-point amplitudes
H. Chamati, D. M. Danchev, N. S. Tonchev
The scaling properties of the free energy and some of universal amplitudes of a group of models belonging to the universality class of the quantum nonlinear sigma model and the O(n…