43 research outputs found
Nonextensive Thermostatistical Investigation of The Blackbody Radiation
Thermodynamical quantities of the blackbody radiation, such as free energy,
entropy, total radiation energy, specific heat are calculated within the
Tsallis thermostatistics where factorization method is incorparated. It is
shown that basic thermodynamical relation of the blackbody radiation is form
invariant with respect to nonextensivity entropic index q. Furthermore, the
nonextensive thermodynamical quantities related to the blackbody radiation is
seperately be obtained in terms of q and the standard thermodynamical
quantities of the blackbody radiation .It is indicated that the formulation may
give a way to determine the q which determines the degree of the nonextensivity
that is the one of the aims of the present study.Comment: 16 pages,No figures,to be appear in Chaos,Solitons&Fractal
Evidences for Tsallis non-extensivity on CMR manganites
We found, from the analysis of vs. curves of some manganese oxides
(manganites), that these systems do not follow the traditional
Maxwell-Boltzmann statistics, but the Tsallis statistics, within the
\QTR{em}{normalized} formalism. Curves were calculated within the mean field
approximation, for various ferromagnetic samples and the results were compared
to measurements of our own and to various other authors published data, chosen
at random from the literature. The agreement between the experimental data and
calculated vs. curve, where is an effective
temperature, is excellent for all the compounds. The entropic parameter, ,
correlates in a simple way with the experimental value of , irrespect
the chemical composition of the compounds, heat treatment or other details on
sample preparation. Examples include (superextensivity),
(extensivity) and (subextensivity) cases.Comment: 12 pages, 3 figure
A critique of non-extensive q-entropy for thermal statistics
During the past dozen years there have been numerous articles on a relation
between entropy and probability which is non-additive and has a parameter
that depends on the nature of the thermodynamic system under consideration. For
this relation corresponds to the Boltzmann-Gibbs entropy, but for other
values of it is claimed that it leads to a formalism which is consistent
with the laws of thermodynamics. However, it is shown here that the joint
entropy for systems having {\it different} values of is not defined in this
formalism, and consequently fundamental thermodynamic concepts such as
temperature and heat exchange cannot be considered for such systems. Moreover,
for the probability distribution for weakly interacting systems does
not factor into the product of the probability distribution for the separate
systems, leading to spurious correlations and other unphysical consequences,
e.g. non-extensive energy, that have been ignored in various applications given
in the literature
Cumulative growth with fibonacci approach, golden section and physics
WOS: 000271434200005In this study, a physical quantity belonging to a physical system in its stages of orientation towards growth has been formulated using Fibonacci recurrence approximation. Fibonacci p-numbers emerging in this process have been expressed as a power law for the first time as far as we are aware. The golden sections sp are related to the growth percent rates lambda(p). With this mechanism, the physical origins of the mathematical forms of e(q)(x) and ln(q)(x) encountered in Tsallis thermostatistics have been clarified. It has been established that Fibonacci p-numbers could be taken as elements of generalized random Cantor set. The golden section random cantor set is used by M. S. El Naschie in his fundamental works in high energy physics and is also considered in the present work. Moreover, we conclude that the cumulative growth mechanism conveys the consequences of the discrete structure of space and memory effect. (C) 2008 Elsevier Ltd. All rights reserved