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Dark Matter
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<blockquote data-quote="Riberra" data-source="post: 65062931" data-attributes="member: 345318"><p>Ha!The Bullet Cluster ...Interesting subject indeed!</p><p></p><p></p><p>[FONT=&quot]The dark matter hypothesis for the bullet cluster is contradicted by the cold dark matter [/FONT][FONT=&quot]&#923;CDM[/FONT][FONT=&quot] model.[/FONT][FONT=&quot]<a href="http://arxiv.org/abs/0711.0967" target="_blank">Mastropietro & Burkert</a> (2008) have shown that an initial relative velocity of the two colliding clusters would need to be around 3000 km/s in order to explain the observed shock velocity, X-ray brightness ratio and morphology of the main and sub-cluster. However, <a href="http://arxiv.org/abs/1003.0939" target="_blank">Jounghun and Eiichiro</a> (2010) have shown that such a high infall velocity is incompatible with the predictions of the cold dark matter [/FONT][FONT=&quot] model. The probability that such an event could occur is <a href="http://www.scilogs.eu/en/blog/the-dark-matter-crisis/2010-07-30/but-the-bullet-cluster-...-proof-of-cold-or-warm-dark-matter-in-galaxy-clusters-is-but-a-myth" target="_blank">roughly one in 10 billion</a>! The lower velocity simulations of, for example <a href="http://arxiv.org/abs/astro-ph/0703199" target="_blank">Milosavljevic et. al.</a> (2007) and <a href="http://arxiv.org/abs/astro-ph/0703232" target="_blank">Springel& Farrar (2007)</a>, that could be compatible with [/FONT][FONT=&quot], do not reproduce the weak lensing data of the Bullet cluster. What this means is that it is pretty much impossible that the lensing effect seen in the Bullet cluster can be due to dark matter, based on the cold dark matter models <a href="http://arxiv.org/abs/1003.0939" target="_blank">Jounghun and Eiichiro</a> .</p><p>[/FONT]</p></blockquote><p></p>
[QUOTE="Riberra, post: 65062931, member: 345318"] Ha!The Bullet Cluster ...Interesting subject indeed! [FONT="]The dark matter hypothesis for the bullet cluster is contradicted by the cold dark matter [/FONT][FONT="]ΛCDM[/FONT][FONT="] model.[/FONT][FONT="][URL="http://arxiv.org/abs/0711.0967"]Mastropietro & Burkert[/URL] (2008) have shown that an initial relative velocity of the two colliding clusters would need to be around 3000 km/s in order to explain the observed shock velocity, X-ray brightness ratio and morphology of the main and sub-cluster. However, [URL="http://arxiv.org/abs/1003.0939"]Jounghun and Eiichiro[/URL] (2010) have shown that such a high infall velocity is incompatible with the predictions of the cold dark matter [/FONT][FONT="] model. The probability that such an event could occur is [URL="http://www.scilogs.eu/en/blog/the-dark-matter-crisis/2010-07-30/but-the-bullet-cluster-...-proof-of-cold-or-warm-dark-matter-in-galaxy-clusters-is-but-a-myth"]roughly one in 10 billion[/URL]! The lower velocity simulations of, for example [URL="http://arxiv.org/abs/astro-ph/0703199"]Milosavljevic et. al.[/URL] (2007) and [URL="http://arxiv.org/abs/astro-ph/0703232"]Springel& Farrar (2007)[/URL], that could be compatible with [/FONT][FONT="], do not reproduce the weak lensing data of the Bullet cluster. What this means is that it is pretty much impossible that the lensing effect seen in the Bullet cluster can be due to dark matter, based on the cold dark matter models [URL="http://arxiv.org/abs/1003.0939"]Jounghun and Eiichiro[/URL] . [/FONT] [/QUOTE]
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