Appendix/Ramblings/DarkMatterMusings - Revision history

Joel2 at 00:24, 15 October 2024

2024-10-15T00:24:37Z

← Older revision		Revision as of 20:24, 14 October 2024
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	<ul>		<ul>
	<li>[http://adsabs.harvard.edu/abs/1983IAUS..100..205T ''Stabilizing a Cold Disk with a <math>1/r</math> Force Law.'']</li>		<li>[http://adsabs.harvard.edu/abs/1983IAUS..100..205T ''Stabilizing a Cold Disk with a <math>1/r</math> Force Law.'']</li>
	<li>[~~http~~://www.phys.lsu.edu/faculty/tohline/vita/Tohline.C5.pdf ''Does Gravity Exhibit a <math>1/r</math> force on the Scale of Galaxies?'']</li>		<li>[https://www.phys.lsu.edu/faculty/tohline/vita/Tohline.C5.pdf ''Does Gravity Exhibit a <math>1/r</math> force on the Scale of Galaxies?'']</li>
	</ul>		</ul>

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	<ul>		<ul>
	<li>[~~http~~://www.phys.lsu.edu/faculty/tohline/TinsleyNotes1978.pdf Notes from Beatrice Tinsley] showing that she, too, had given some thought to the implications of a <math>1/r</math> force-law for gravity in 1978.</li>		<li>[https://www.phys.lsu.edu/faculty/tohline/TinsleyNotes1978.pdf Notes from Beatrice Tinsley] showing that she, too, had given some thought to the implications of a <math>1/r</math> force-law for gravity in 1978.</li>
	<li>[[DarkMatter/VeraRubin\|Early interactions with Vera Rubin]].</li>		<li>[[DarkMatter/VeraRubin\|Early interactions with Vera Rubin]].</li>
	<li>[[DarkMatter/UniformSphere\|Attraction associated with a uniform-density sphere]] — my derivation in the early '80s, with the kind assistance of LSU Professor Attipat K. Rajagopal.</li>		<li>[[DarkMatter/UniformSphere\|Attraction associated with a uniform-density sphere]] — my derivation in the early '80s, with the kind assistance of LSU Professor Attipat K. Rajagopal.</li>

Joel2: /* Musings Regarding Dark Matter and Dark Energy */

2024-10-15T00:19:07Z

Musings Regarding Dark Matter and Dark Energy

← Older revision		Revision as of 20:19, 14 October 2024
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	<ul>		<ul>
	<li>[http://adsabs.harvard.edu/abs/1983IAUS..100..205T ''Stabilizing a Cold Disk with a <math>1/r</math> Force Law.'']</li>		<li>[http://adsabs.harvard.edu/abs/1983IAUS..100..205T ''Stabilizing a Cold Disk with a <math>1/r</math> Force Law.'']</li>
	<li>[http://www.phys.lsu.edu/~tohline/vita/Tohline.C5.pdf ''Does Gravity Exhibit a <math>1/r</math> force on the Scale of Galaxies?'']</li>		<li>[http://www.phys.lsu.edu/faculty/tohline/vita/Tohline.C5.pdf ''Does Gravity Exhibit a <math>1/r</math> force on the Scale of Galaxies?'']</li>
	</ul>		</ul>

Joel2: /* Musings Regarding Dark Matter and Dark Energy */

2024-10-15T00:18:06Z

Musings Regarding Dark Matter and Dark Energy

← Older revision		Revision as of 20:18, 14 October 2024
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	<ul>		<ul>
	<li>[http://www.phys.lsu.edu/~tohline/TinsleyNotes1978.pdf Notes from Beatrice Tinsley] showing that she, too, had given some thought to the implications of a <math>1/r</math> force-law for gravity in 1978.</li>		<li>[http://www.phys.lsu.edu/faculty/tohline/TinsleyNotes1978.pdf Notes from Beatrice Tinsley] showing that she, too, had given some thought to the implications of a <math>1/r</math> force-law for gravity in 1978.</li>
	<li>[[DarkMatter/VeraRubin\|Early interactions with Vera Rubin]].</li>		<li>[[DarkMatter/VeraRubin\|Early interactions with Vera Rubin]].</li>
	<li>[[DarkMatter/UniformSphere\|Attraction associated with a uniform-density sphere]] — my derivation in the early '80s, with the kind assistance of LSU Professor Attipat K. Rajagopal.</li>		<li>[[DarkMatter/UniformSphere\|Attraction associated with a uniform-density sphere]] — my derivation in the early '80s, with the kind assistance of LSU Professor Attipat K. Rajagopal.</li>

Joel2 at 21:57, 11 July 2024

2024-07-11T21:57:48Z

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			NOTE: Initially these comments were presented as part of an [[OldVistrailsCoverPage#Musings_Regarding_Dark_Matter_and_Dark_Energy\|overview that appeared on the VisTrails MediaWiki engine]].

	=Musings Regarding Dark Matter and Dark Energy=		=Musings Regarding Dark Matter and Dark Energy=

Joel2: Created page with " =Musings Regarding Dark Matter and Dark Energy= [Joel E. Tohline recollection on 3/8/2015] It was during my first year (July 1978 - June 1979) as a J. Willard Gibbs Instructor in the Astronomy Department at Yale University that I started wondering whether the nearly ubiquitous display of "flat rotation curves" in disk galaxies might be exp..."

2024-07-11T21:52:23Z

Created page with "  =Musings Regarding Dark Matter and Dark Energy= [Joel E. Tohline recollection on 3/8/2015] It was during my first year (July 1978 - June 1979) as a J. Willard Gibbs Instructor in the Astronomy Department at Yale University that I started wondering whether the nearly ubiquitous display of "flat rotation curves" in disk galaxies might be exp..."

New page

=Musings Regarding Dark Matter and Dark Energy=

[Joel E. Tohline recollection on 3/8/2015] It was during my first year (July 1978 - June 1979) as a J. Willard Gibbs Instructor in the Astronomy Department at Yale University that I started wondering whether the nearly ubiquitous display of "flat rotation curves" in disk galaxies might be explained, not via the dark matter hypothesis, but by invoking a <math>1/r</math> force-law for gravity at large distances. My reasoning was simple:
<ol>
<li>I was uncomfortable with the "dark matter" hypothesis, which smelled to me like the story of aether, all over again.</li>
<li>If Isaac Newton had been handed Vera Rubin's observations — which showed that orbital velocities were approximately constant with distance — instead of Kepler's observations — which showed that orbital velocities behaved as <math>v \propto r^{-1/2}</math> — he likely would have hypothesized that the gravitational acceleration due to a central point mass is proportional to <math>r^{-1}</math> instead of <math>r^{-2}</math>.</li>
</ol>
While I put quite a lot of thought into this idea in the late '70s and early '80s — and I still give it some thought from time to time because I consider the astrophysics community's fundamental understanding of "dark matter" and now, too, "dark energy" to be weak — I produced only two publications on the topic, neither of which was in a refereed archival journal:
<ul>
<li>[http://adsabs.harvard.edu/abs/1983IAUS..100..205T ''Stabilizing a Cold Disk with a <math>1/r</math> Force Law.'']</li>
<li>[http://www.phys.lsu.edu/~tohline/vita/Tohline.C5.pdf ''Does Gravity Exhibit a <math>1/r</math> force on the Scale of Galaxies?'']</li>
</ul>

From time to time, I plan to post here some of the research notes that I have generated on this topic over the years, as well as recollections of discussions of the topic that I have had with professional colleagues. I begin by posting a scanned copy of one of my most cherished possessions from my time at Yale.

<ul>
<li>[http://www.phys.lsu.edu/~tohline/TinsleyNotes1978.pdf Notes from Beatrice Tinsley] showing that she, too, had given some thought to the implications of a <math>1/r</math> force-law for gravity in 1978.</li>
<li>[[DarkMatter/VeraRubin|Early interactions with Vera Rubin]].</li>
<li>[[DarkMatter/UniformSphere|Attraction associated with a uniform-density sphere]] — my derivation in the early '80s, with the kind assistance of LSU Professor Attipat K. Rajagopal.</li>
<li>[[DarkMatter/CK2015|Remarks on Christodoulou & Kazanas (2015)]].</li>
<li>[[Appendix/Ramblings/StrongNuclearForce|Radial Dependence of the Strong Nuclear Force]]</li>
</ul>

[Joel E. Tohline on 24 October 2022] Today I stumbled on the following interesting paper:
<ul>
<li>
[https://www.raa-journal.org/issues/all/2014/v14n10/202203/P020220325476789616599.pdf C. Lu, Z.-W. Li, S.-F. Yuan, Z. Wan, S.-H. Qin, K. Zhu, & Y. Xie (2014), Research in Astronomy and Astrophysics, Vol. 14, No. 10, pp. 1301 - 1306]:   ''Preliminary Limits on a Logarithmic Correction to the Newtonian Gravitational Potential in Binary Pulsars''. They "estimate the upper limit of the Tohline-Kuhn-Kruglyak parameter λ …" They, in turn, refer to the following …
<ul>
<li>[https://ui.adsabs.harvard.edu/abs/1977AN....298...65M/abstract J. P. Mücket & H.-J. Treder (1977, Astronomische Nachrichten, Vol. 298, Issue 2, p. 65)] <-- First to consider ''The Perihelion Advance according to a Post-Newtonian Gravitational Law with Logarithmic Correction Term'' in the context of planets.</li>
<li>[https://ui.adsabs.harvard.edu/abs/2012PhR...513....1C/abstract T. Clifton, P. G. Ferreira, A. Padilla, & C. Skordis (2012, Physics Reports, Vol. 513, Issue 1, pp. 1 - 189)] <-- recent review titled, ''Modified Gravity and Cosmology''.</li>
</ul>
</li>
</ul>

=See Also=

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