Entropy Maximization, Cutoff Distribution, and Finite Stellar Masses
Conventional equilibrium statistical mechanics of open gravitational systems is known to be problematical. We first recall that spherical stars/galaxies acquire unbounded radii, become infinitely massive, and evaporate away continuously if one uses the standard Maxwellian distribution fB (which max...
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| Format: | Article |
| Language: | English |
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Wiley
2008-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2008/870804 |
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| author | Ritesh Kumar Dubey V. J. Menon M. K. Pandey D. N. Tripathi |
| author_facet | Ritesh Kumar Dubey V. J. Menon M. K. Pandey D. N. Tripathi |
| author_sort | Ritesh Kumar Dubey |
| collection | DOAJ |
| description | Conventional equilibrium statistical mechanics of open gravitational systems is known to be problematical. We first recall that spherical stars/galaxies acquire unbounded radii, become infinitely massive, and evaporate away continuously if one uses the standard Maxwellian distribution fB (which maximizes the usual Boltzmann-Shannon entropy and hence has a tail extending to infinity). Next, we show that these troubles disappear automatically if we employ the exact most probable distribution f (which maximizes the combinatorial entropy and hence possesses a sharp cutoff tail). Finally, if astronomical observation is carried out on a large galaxy, then the Poisson equation together with thermal de Broglie wavelength provides useful information about the cutoff radius rK, cutoff energy εK, and the huge quantum number K up to which the cluster exists. Thereby, a refinement over the empirical lowered isothermal King models, is achieved. Numerically, we find that the most probable distribution (MPD) prediction fits well the number density profile near the outer edge of globular clusters. |
| format | Article |
| id | doaj-art-aa7667201af647bca7cbdfff2008daa8 |
| institution | OA Journals |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2008-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-aa7667201af647bca7cbdfff2008daa82025-08-20T02:20:54ZengWileyAdvances in Astronomy1687-79691687-79772008-01-01200810.1155/2008/870804870804Entropy Maximization, Cutoff Distribution, and Finite Stellar MassesRitesh Kumar Dubey0V. J. Menon1M. K. Pandey2D. N. Tripathi3Department of Physics, Banaras Hindu University, Varanasi 221 005, IndiaDepartment of Physics, Banaras Hindu University, Varanasi 221 005, IndiaDepartment of Physics, Banaras Hindu University, Varanasi 221 005, IndiaDepartment of Physics, Banaras Hindu University, Varanasi 221 005, IndiaConventional equilibrium statistical mechanics of open gravitational systems is known to be problematical. We first recall that spherical stars/galaxies acquire unbounded radii, become infinitely massive, and evaporate away continuously if one uses the standard Maxwellian distribution fB (which maximizes the usual Boltzmann-Shannon entropy and hence has a tail extending to infinity). Next, we show that these troubles disappear automatically if we employ the exact most probable distribution f (which maximizes the combinatorial entropy and hence possesses a sharp cutoff tail). Finally, if astronomical observation is carried out on a large galaxy, then the Poisson equation together with thermal de Broglie wavelength provides useful information about the cutoff radius rK, cutoff energy εK, and the huge quantum number K up to which the cluster exists. Thereby, a refinement over the empirical lowered isothermal King models, is achieved. Numerically, we find that the most probable distribution (MPD) prediction fits well the number density profile near the outer edge of globular clusters.http://dx.doi.org/10.1155/2008/870804 |
| spellingShingle | Ritesh Kumar Dubey V. J. Menon M. K. Pandey D. N. Tripathi Entropy Maximization, Cutoff Distribution, and Finite Stellar Masses Advances in Astronomy |
| title | Entropy Maximization, Cutoff Distribution, and Finite Stellar Masses |
| title_full | Entropy Maximization, Cutoff Distribution, and Finite Stellar Masses |
| title_fullStr | Entropy Maximization, Cutoff Distribution, and Finite Stellar Masses |
| title_full_unstemmed | Entropy Maximization, Cutoff Distribution, and Finite Stellar Masses |
| title_short | Entropy Maximization, Cutoff Distribution, and Finite Stellar Masses |
| title_sort | entropy maximization cutoff distribution and finite stellar masses |
| url | http://dx.doi.org/10.1155/2008/870804 |
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