BaalChatzaf Posted December 6, 2008 Share Posted December 6, 2008 Dark Matter, a type of matter that does not interact with any of the particles of the Standard Model has been inferred from the motion curves of stars at the outer portions of galaxies. The inference assumes the correctness of General Relativity at a galactic scale. Dark Matter has hither to be known only by its gravitational effects on normal matter.Recently evidence not depending on General Relativity has been found indicating the presence of Dark Matter. See http://physicsworld.com/cws/article/news/36919See also http://arxiv.org/abs/0810.0713Finally, we are getting more direct evidence for Dark Matter.There is more in Heaven and Earth than was previously dreamed of in our philosophy.Ba'al Chatzaf Link to comment Share on other sites More sharing options...
Brant Gaede Posted December 7, 2008 Share Posted December 7, 2008 Dark Matter, a type of matter that does not interact with any of the particles of the Standard Model has been inferred from the motion curves of stars at the outer portions of galaxies. The inference assumes the correctness of General Relativity at a galactic scale. Dark Matter has hither to be known only by its gravitational effects on normal matter.Recently evidence not depending on General Relativity has been found indicating the presence of Dark Matter. See http://physicsworld.com/cws/article/news/36919See also http://arxiv.org/abs/0810.0713Finally, we are getting more direct evidence for Dark Matter.There is more in Heaven and Earth than was previously dreamed of in our philosophy.Ba'al ChatzafWhen you joined this list that was all the proof I needed.--Brant Link to comment Share on other sites More sharing options...
Brant Gaede Posted December 7, 2008 Share Posted December 7, 2008 Dark Matter, a type of matter that does not interact with any of the particles of the Standard Model has been inferred from the motion curves of stars at the outer portions of galaxies. The inference assumes the correctness of General Relativity at a galactic scale. Dark Matter has hither to be known only by its gravitational effects on normal matter.Recently evidence not depending on General Relativity has been found indicating the presence of Dark Matter. See http://physicsworld.com/cws/article/news/36919See also http://arxiv.org/abs/0810.0713Finally, we are getting more direct evidence for Dark Matter.There is more in Heaven and Earth than was previously dreamed of in our philosophy.Ba'al ChatzafIf it doesn't depend on GR doesn't that mean it's wrong?--Brant Link to comment Share on other sites More sharing options...
BaalChatzaf Posted December 7, 2008 Author Share Posted December 7, 2008 Dark Matter, a type of matter that does not interact with any of the particles of the Standard Model has been inferred from the motion curves of stars at the outer portions of galaxies. The inference assumes the correctness of General Relativity at a galactic scale. Dark Matter has hither to be known only by its gravitational effects on normal matter.Recently evidence not depending on General Relativity has been found indicating the presence of Dark Matter. See http://physicsworld.com/cws/article/news/36919See also http://arxiv.org/abs/0810.0713Finally, we are getting more direct evidence for Dark Matter.There is more in Heaven and Earth than was previously dreamed of in our philosophy.Ba'al ChatzafIf it doesn't depend on GR doesn't that mean it's wrong?--BrantNo.It means that Dark Matter which is thought to be a weakly interacting massive particle (WIMP) has other effects besides gravitation.We know atoms gravitate but we see mostly their electro-magnetic effects in the form of radiation (photon emissions). Ba'al Chatzaf Link to comment Share on other sites More sharing options...
Brant Gaede Posted December 7, 2008 Share Posted December 7, 2008 Dark Matter, a type of matter that does not interact with any of the particles of the Standard Model has been inferred from the motion curves of stars at the outer portions of galaxies. The inference assumes the correctness of General Relativity at a galactic scale. Dark Matter has hither to be known only by its gravitational effects on normal matter.Recently evidence not depending on General Relativity has been found indicating the presence of Dark Matter. See http://physicsworld.com/cws/article/news/36919See also http://arxiv.org/abs/0810.0713Finally, we are getting more direct evidence for Dark Matter.There is more in Heaven and Earth than was previously dreamed of in our philosophy.Ba'al ChatzafIf it doesn't depend on GR doesn't that mean it's wrong?--BrantNo.It means that Dark Matter which is thought to be a weakly interacting massive particle (WIMP) has other effects besides gravitation.We know atoms gravitate but we see mostly their electro-magnetic effects in the form of radiation (photon emissions). Ba'al ChatzafCould this mean gravitation is possibly not the most under-rated and possibly not the most significant force in the known universe?--Brant Link to comment Share on other sites More sharing options...
Guyau Posted May 1, 2009 Share Posted May 1, 2009 (edited) Progress on the Neuralino Candidate for Dark MatterNeutralino Dark Matter? Nearby Clump?Hooper, Stebbins, and ZurekSidebar: Sterile Neutrino Update. . . . Beginning in 1968 experimental counts of neutrinos reaching the earth from the sun were found to be less than half the number expected according to our understanding of the nuclear-fusion process by which they are produced in the sun. There are three types of matter neutrinos (and three types of anti-matter neutrinos, and perhaps, a seventh neutrino, called “sterile” [which might constitute the negative-pressure sea we call “dark energy”]). These are the electron-, muon-, and tau-neutrinos.Discussion of implications of new experimental results bearing on possible seventh neutrino:http://resonaances.blogspot.com/2007/04/after-miniboone.htmlCandidate for dark energy: sterile neutrino (above).Candidate for dark matter: neutralino (below).http://www.physorg.com/news134822510.htmlhttp://arxiv.org/PS_cache/arxiv/pdf/0802/0802.2968v2.pdfAlternative to dark energy as explanation for acceleration of cosmic expansion, along with possible tests:Does Dark Energy Really Exist?Clifton and FerreiraSci. Am. April 2009 Edited May 1, 2009 by Stephen Boydstun Link to comment Share on other sites More sharing options...
Guyau Posted January 14, 2011 Share Posted January 14, 2011 .Another effect of dark matter to look for is reported here: Galactic Satellites. Link to comment Share on other sites More sharing options...
BaalChatzaf Posted January 14, 2011 Author Share Posted January 14, 2011 .Another effect of dark matter to look for is reported here: Galactic Satellites.That is excellent news. This means our main gravitational theories are still applicable.Thank you for sharing this.Ba'al Chatzaf Link to comment Share on other sites More sharing options...
dennislmay Posted January 14, 2011 Share Posted January 14, 2011 Dark Matter, a type of matter that does not interact with any of the particles of the Standard Model has been inferred from the motion curves of stars at the outer portions of galaxies. The inference assumes the correctness of General Relativity at a galactic scale. Dark Matter has hither to be known only by its gravitational effects on normal matter.Recently evidence not depending on General Relativity has been found indicating the presence of Dark Matter. See http://physicsworld.com/cws/article/news/36919See also http://arxiv.org/abs/0810.0713Finally, we are getting more direct evidence for Dark Matter.There is more in Heaven and Earth than was previously dreamed of in our philosophy.Ba'al ChatzafArticles from 2008? Link to comment Share on other sites More sharing options...
dennislmay Posted January 14, 2011 Share Posted January 14, 2011 Progress on the Neuralino Candidate for Dark Matter<A href="http://arxiv.org/pdf/0812.3202v1">Neutralino Dark Matter? Nearby Clump?<A/>Hooper, Stebbins, and ZurekSidebar: Sterile Neutrino Update. . . . Beginning in 1968 experimental counts of neutrinos reaching the earth from the sun were found to be less than half the number expected according to our understanding of the nuclear-fusion process by which they are produced in the sun. There are three types of matter neutrinos (and three types of anti-matter neutrinos, and perhaps, a seventh neutrino, called “sterile” [which might constitute the negative-pressure sea we call “dark energy”]). These are the electron-, muon-, and tau-neutrinos.Discussion of implications of new experimental results bearing on possible seventh neutrino:http://resonaances.blogspot.com/2007/04/after-miniboone.htmlCandidate for dark energy: sterile neutrino (above).Candidate for dark matter: neutralino (below).http://www.physorg.com/news134822510.htmlhttp://arxiv.org/PS_cache/arxiv/pdf/0802/0802.2968v2.pdfAlternative to dark energy as explanation for acceleration of cosmic expansion, along with possible tests:<A href="http://www.scientificamerican.com/article.cfm?id=does-dark-energy-exist">Does Dark Energy Really Exist?</A>Clifton and FerreiraSci. Am. April 2009Another 2008 Article and a 2009 article - if we are in a special place the CMBR evidence for the Big Bang goes out the window. Link to comment Share on other sites More sharing options...
Guyau Posted April 11, 2011 Share Posted April 11, 2011 (edited) . . .Alternative to dark energy as explanation for acceleration of cosmic expansion, along with possible tests:"Does Dark Energy Really Exist?"Clifton and FerreiraSci. Am. April 2009The proposal by Clifton and Ferreira that the acceleration of the expansion of the universe* could be accounted for by—instead of dark energy (such as the hypothetical sterile neutrino)—our galaxy being at the center of an enormous region whose average density is substantially lower than that of the universe beyond it, that proposal has now been ruled out by observation. The story is here. Edited April 11, 2011 by Stephen Boydstun Link to comment Share on other sites More sharing options...
BaalChatzaf Posted April 11, 2011 Author Share Posted April 11, 2011 ote]Another 2008 Article and a 2009 article - if we are in a special place the CMBR evidence for the Big Bang goes out the window.Apparently we are not in a special place. Beware of theories that put us as the center of anything.Nature may be simple (at its core) but it is not simple minded. We still need mathematics and experiment to understand her. Philosophical purity is an inadequate tool.Ba'al Chatzaf Link to comment Share on other sites More sharing options...
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