Nonextensive thermostatistics for heterogeneous systems containing different $q$'s

TL;DR

This paper extends Tsallis nonextensive thermostatistics to heterogeneous systems with different q-values by proposing a new nonadditivity rule, establishing a zeroth law of thermodynamics for such systems.

Contribution

It introduces a generalized nonadditivity rule for Tsallis entropy applicable to systems with varying q-values, enabling broader applicability of nonextensive statistics.

Findings

Proposed a new nonadditivity rule for Tsallis entropy.

Proved the rule leads to Tsallis entropy for different q-systems.

Established a zeroth law of thermodynamics for heterogeneous q-systems.

Abstract

The nonextensive statistics based on Tsallis entropy have been so far used for the systems composed of subsystems having same $q$. The applicability of this statistics to the systems with different $q$'s is still a matter of investigation. The actual difficulty is that the class of systems to which the theory has been applied is limited by the usual nonadditivity rule of Tsallis entropy which, in reality, has been established for the systems having same $q$ value. In this paper, we propose a more general nonadditivity rule for Tsallis entropy. This rule, as the usual one for same $q$-systems, can be proved to lead uniquely to Tsallis entropy in the context of systems containing different $q$-subsystems. A zeroth law of thermodynamics is established between different $q$-systems on the basis of this new nonadditivity.