Entropy in Relativistic Fluid Dynamics and Magnetohydrodynamics and Its Implications to the Cosmological Dark Energy and Dark Matter Problems
A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Astrophysics, Cosmology, and Black Holes".
Deadline for manuscript submissions: 31 October 2026 | Viewed by 10
Special Issue Editor
Interests: relativistic dynamics and relativistic engines; non-barotropic (entropy dependent) fluid dynamics and magnetohydrodynamics; topological conservation laws in entropy dependent flow dynamics
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
In recent years, retarded gravity has explained many of the mysteries surrounding the “missing mass” related to galactic rotation curves, Tully–Fisher relations, and gravitational lensing phenomena. Indeed, a recent paper analyzing 143 galaxies has demonstrated that retarded gravity will suffice to explain galaxies’ rotation curves without the need to postulate dark matter. Moreover, it also demystified the “missing mass” related to galactic clusters and elliptic galaxies in which excess matter was derived through the virial theorem. However, on the cosmological scale, dark matter, and more so dark energy, continue to haunt cosmological modelling, which seems the only way to explain the distance velocity relations of distant super nova, as well as the perturbation spectrum which characterizes the cosmological microwave background and large-scale structure (baryonic acoustic oscillations). Cosmology, however, has recently shed other ghosts (inflaton fields) by considering that the universe must have been initially Euclidean and collapsed into the present Lorentzian epoch due to its own internal dynamics. The first cracks appeared in the LCDM model when it was noticed that the Hubble constant cannot remain constant during the entire evolution of the cosmos. A seemingly unrelated problem but in truth has much to do with the above problems is the variational formulation of relativistic non-barotropic flows, which is an interesting problem by its own merit in mathematical physics. The reason is that using the variational formulation of non-barotropic relativistic fluid dynamics one can derive the canonical energy–momentum tensor of non-barotropic flows and better understand how the components of the tensor are affected by entropy in both the Lorentzian and Euclidean epochs. Those components drive eventually the evolution of the universe through the FRW equations. This Special Issue will focus on the following issues:
- Solutions to the dark matter and dark energy problem in astrophysical and cosmological scales.
- Variational Formalism of relativistic non-barotropic fluid dynamics and magnetohydrodynamics including related issues such as canonical energy-momentum tensors and topological conservation laws.
- Relations between the two topics listed above.
Prof. Dr. Asher Yahalom
Guest Editor
Manuscript Submission Information
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Keywords
- relativistic dynamics
- non-barotropic (entropy-dependent) fluid dynamics and magnetohydrodynamics
- topological conservation laws in entropy-dependent flow dynamics, dark matter, dark energy
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