Appendix/Ramblings/DarkMatterMusings - Revision history

Jet53man: /* Musings Regarding Dark Matter and Dark Energy */

2022-10-24T22:27:34Z

Musings Regarding Dark Matter and Dark Energy

← Older revision		Revision as of 18:27, 24 October 2022
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	=Musings Regarding Dark Matter and Dark Energy=		=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:		[<font color="red">Joel E. Tohline recollection on 3/8/2015</font>] 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>		<ol>
	<li>I was uncomfortable with the "dark matter" hypothesis, which smelled to me like the story of aether, all over again.</li>		<li>I was uncomfortable with the "dark matter" hypothesis, which smelled to me like the story of aether, all over again.</li>
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	<li>[[DarkMatter/CK2015\|Remarks on Christodoulou & Kazanas (2015)]].</li>		<li>[[DarkMatter/CK2015\|Remarks on Christodoulou & Kazanas (2015)]].</li>
	<li>[[Appendix/Ramblings/StrongNuclearForce\|Radial Dependence of the Strong Nuclear Force]]</li>		<li>[[Appendix/Ramblings/StrongNuclearForce\|Radial Dependence of the Strong Nuclear Force]]</li>
			</ul>

			[<font color="red">Joel E. Tohline on 24 October 2022</font>] 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 <b>Tohline-Kuhn-Kruglyak</b> 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>		</ul>

Jet53man: /* Musings Regarding Dark Matter and Dark Energy */

2022-01-03T18:21:49Z

Musings Regarding Dark Matter and Dark Energy

← Older revision		Revision as of 14:21, 3 January 2022
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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/~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>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>
	<li>[[DarkMatter/CK2015\|Remarks on Christodoulou & Kazanas (2015)]].</li>		<li>[[DarkMatter/CK2015\|Remarks on Christodoulou & Kazanas (2015)]].</li>

Jet53man at 18:12, 3 January 2022

2022-01-03T18:12:59Z

← Older revision		Revision as of 14:12, 3 January 2022
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	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:		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>		<ul>
	<li>''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>''Does Gravity Exhibit a <math>1/r</math> force on the Scale of Galaxies?''</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>		</ul>

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	<ul>		<ul>
	<li>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/~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>Early interactions with Vera Rubin.</li>		<li>Early interactions with Vera Rubin.</li>
	<li>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>
	<li>Remarks on Christodoulou & Kazanas (2015).</li>		<li>[[DarkMatter/CK2015\|Remarks on Christodoulou & Kazanas (2015)]].</li>
	<li>[[Appendix/Ramblings/StrongNuclearForce\|Radial Dependence of the Strong Nuclear Force]]</li>		<li>[[Appendix/Ramblings/StrongNuclearForce\|Radial Dependence of the Strong Nuclear Force]]</li>
	</ul>		</ul>

Jet53man: /* Musings Regarding Dark Matter and Dark Energy */

2022-01-02T23:17:17Z

Musings Regarding Dark Matter and Dark Energy

← Older revision		Revision as of 19:17, 2 January 2022
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	<li>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>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>Remarks on Christodoulou & Kazanas (2015).</li>		<li>Remarks on Christodoulou & Kazanas (2015).</li>
	<li>Radial Dependence of the Strong Nuclear Force</li>		<li>[[Appendix/Ramblings/StrongNuclearForce\|Radial Dependence of the Strong Nuclear Force]]</li>
	</ul>		</ul>

Jet53man: /* Musings Regarding Dark Matter and Dark Energy */

2022-01-02T23:15:45Z

Musings Regarding Dark Matter and Dark Energy

@@ Line 12: / Line 12: @@
 <li>''Stabilizing a Cold Disk with a <math>1/r</math> Force Law.''</li>
 <li>''Does Gravity Exhibit a <math>1/r</math> force on the Scale of Galaxies?''</li>
 </ul>

Jet53man: /* Musings Regarding Dark Matter and Dark Energy */

2022-01-02T22:55:51Z

Musings Regarding Dark Matter and Dark Energy

← Older revision		Revision as of 18:55, 2 January 2022
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	[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:		[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>''Stabilizing a Cold Disk with a <math>1/r</math> Force Law.''</li>
			<li>''Does Gravity Exhibit a <math>1/r</math> force on the Scale of Galaxies?''</li>
			</ul>

	=See Also=		=See Also=

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2022-01-02T22:45:13Z

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=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:

=See Also=

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