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Article

Entropy and Variational Formulation of Relativistic Fluid Dynamics

1
Department of Electrical & Electronic Engineering, Faculty of Engineering, Ariel University, Ariel 40700, Israel
2
Center for Astrophysics, Geophysics, and Space Sciences (AGASS), Ariel University, Ariel 40700, Israel
3
FEL User Center, Ariel University, Ariel 40700, Israel
Entropy 2025, 27(12), 1260; https://doi.org/10.3390/e27121260
Submission received: 30 October 2025 / Revised: 7 December 2025 / Accepted: 14 December 2025 / Published: 16 December 2025

Abstract

In this work, the earlier variational analysis of classical non-barotropic flows is extended to the special relativistic non-barotropic case. Specifically, we present a new Eulerian variational formulation for relativistic non-barotropic flows, based on six functions. This allows the canonical derivation of the energy–momentum tensor.
Keywords: non-barotropic flows; variational analysis; relativistic flows non-barotropic flows; variational analysis; relativistic flows

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MDPI and ACS Style

Yahalom, A. Entropy and Variational Formulation of Relativistic Fluid Dynamics. Entropy 2025, 27, 1260. https://doi.org/10.3390/e27121260

AMA Style

Yahalom A. Entropy and Variational Formulation of Relativistic Fluid Dynamics. Entropy. 2025; 27(12):1260. https://doi.org/10.3390/e27121260

Chicago/Turabian Style

Yahalom, Asher. 2025. "Entropy and Variational Formulation of Relativistic Fluid Dynamics" Entropy 27, no. 12: 1260. https://doi.org/10.3390/e27121260

APA Style

Yahalom, A. (2025). Entropy and Variational Formulation of Relativistic Fluid Dynamics. Entropy, 27(12), 1260. https://doi.org/10.3390/e27121260

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