Zobrazeno 1 - 10
of 23
pro vyhledávání: '"N. S. Tonchev"'
Autor:
N. S. Tonchev
Theoretical studies of nearly spherical vesicles and microemulsion droplets, that present typical examples for thermally-excited systems that are subject to constraints, are reviewed. We consider the shape fluctuations of such systems constrained by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c49f7c3068d945c925aabdf5d5e000dc
http://arxiv.org/abs/2009.09280
http://arxiv.org/abs/2009.09280
Autor:
N. S. Tonchev, Isak Bivas
Publikováno v:
Physical review. E. 100(2-1)
One of the most widely used methods for determination of the bending elasticity modulus of model lipid membranes is the analysis of the shape fluctuations of nearly spherical lipid vesicles. The theoretical basis of this analysis is given by Milner a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cf0c5ab7862f131fbf4b4864f6d127ec
https://pubmed.ncbi.nlm.nih.gov/31574724
https://pubmed.ncbi.nlm.nih.gov/31574724
Publikováno v:
Physica A: Statistical Mechanics and its Applications. 360:297-303
Some results for the black-body radiation obtained in the context of the nonextensive statistical mechanics (normalized approach) are analyzed. Since the obtained elsewhere thermodynamic potential can be expressed in terms of Wright's special functio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::79a921b58f30d6eed898fd55b1178c00
https://doi.org/10.1016/j.physa.2005.06.042
https://doi.org/10.1016/j.physa.2005.06.042
Autor:
N. S. Tonchev
We present a perturbative approach to the problem of computation of mixed-state fidelity susceptibility (MFS) for thermal states. The mathematical techniques used provides an analytical expression for the MFS as a formal expansion in terms of the the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07d4026b870169c2d8ee5585eca6556b
http://arxiv.org/abs/1407.5489
http://arxiv.org/abs/1407.5489
Autor:
Hassan Chamati, N. S. Tonchev
Publikováno v:
Journal of Physics A: Mathematical and General. 33:873-890
In this paper, we study in details the critical behavior of the ${\cal O}(n)$ quantum $\phi^4$ model with long-range interaction decaying with the distances r by a power law as $r^{-d-\sigma}$ in the large n-limit. The zero-temperature critical behav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9440c2ae695a3420e893180fa125e5c
https://doi.org/10.1088/0305-4470/33/5/305
https://doi.org/10.1088/0305-4470/33/5/305
Publikováno v:
Physical Review B. 57:5798-5811
The quantum rotors model can be regarded as an effective model for the low-temperature behavior of the quantum Heisenberg antiferromagnets. Here, we consider a $d$-dimensional model in the spherical approximation confined to a general geometry of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1e082bfc58541ba3f15848f35fa6db04
https://doi.org/10.1103/physrevb.57.5798
https://doi.org/10.1103/physrevb.57.5798
Publikováno v:
Physica A: Statistical Mechanics and its Applications. 227:301-313
For the Keldysh-Kopaev and the Mattis-Langer models the complete phase diagram (T,μ) is characterized. The degree of criticality of the electron-hole pairing fluctuation operator is obtained as a function of the degree of doping.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d18db82b6b681f710426bfa4b88f596a
https://doi.org/10.1016/0378-4371(95)00470-x
https://doi.org/10.1016/0378-4371(95)00470-x
Autor:
N. S. Tonchev, E. S. Pisanova
Publikováno v:
Physica A: Statistical Mechanics and its Applications. 227:325-333
The modified finite-size scaling (for dimensions d ⩾ d > , where d > is the upper critical dimensionality) is verified in the closed vicinity of both the classical and the quantum multicritical points by the example of a quantum model for an anharm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a79952f3849fb17dbdc77682d6e02df4
https://doi.org/10.1016/0378-4371(95)00388-6
https://doi.org/10.1016/0378-4371(95)00388-6
Autor:
N. S. Tonchev
Publikováno v:
Journal of Mathematical Physics. 57:071903
An analytical approach is developed to the problem of computation of monotone Riemannian metrics (e.g. Bogoliubov-Kubo-Mori, Bures, Chernoff, etc.) on the set of quantum states. The obtained expressions originate from the Morozova, Chencov and Petz c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c93565a88caec8bbb27ec63a8520331
https://doi.org/10.1063/1.4955417
https://doi.org/10.1063/1.4955417
Autor:
N. S. Tonchev, Jordan G Brankov
Publikováno v:
Physical Review B. 50:2970-2977
The validity of finite-size scaling in the presence of an inhomogeneous external field vanishing in the thermodynamic-limit is studied using a fully finite three-dimensional mean spherical model. The external field is chosen to change sign stepwise i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d36b11a4eb22683cc98289a0cdb0e9e7
https://doi.org/10.1103/physrevb.50.2970
https://doi.org/10.1103/physrevb.50.2970