Sharapovaphan Posted May 24, 2011 Share Posted May 24, 2011 How can baryonic dark matter exist? Dark matter is nonbaryonic. Shouldn't baryonic dark matter be on the visible ("normal") matter side of the ledger thus subjected to a name change? Or at the very least be treated as something different than dark matter or visible matter. The name is driving me nuts! Link to comment Share on other sites More sharing options...
ajb Posted May 24, 2011 Share Posted May 24, 2011 Baryonic dark matter refers to things like neutron stars, white dwarfs and brown dwarfs. These objects are made up of normal matter i.e. protons and neutrons. Big bang nucleosynthesis suggests that there is not enough baryons in the Universe for there to be sufficient baryonic matter to explain dark matter. This is backed up by careful observation of the CMBR. Link to comment Share on other sites More sharing options...
Sharapovaphan Posted May 24, 2011 Author Share Posted May 24, 2011 I understand. It was mostly semantics with me. In some circles the definition of dark matter is that it is exclusively nonbaryonic. More recently dark matter is described as the vast majority being nonbaryonic. Thank you... Link to comment Share on other sites More sharing options...
Sharapovaphan Posted May 28, 2011 Author Share Posted May 28, 2011 At the top of the blackboard in my high school algebra class was a simple message: "Always go back to the definition." Probably the best advice ever. Link to comment Share on other sites More sharing options...
Sharapovaphan Posted May 29, 2011 Author Share Posted May 29, 2011 Baryonic dark matter refers to things like neutron stars, white dwarfs and brown dwarfs. These objects are made up of normal matter i.e. protons and neutrons. Big bang nucleosynthesis suggests that there is not enough baryons in the Universe for there to be sufficient baryonic matter to explain dark matter. This is backed up by careful observation of the CMBR. The correct or incorrect prediction concerning the density of neutrons and protons around the big bag is so important to everything in this discussion. From how much Helium was present, all the way to the Hubble Constant. Everything points to the required density of baryons (neutrons & protons) being a very low percentage. This indicates that not all dark matter is baryonic. Link to comment Share on other sites More sharing options...
ajb Posted May 29, 2011 Share Posted May 29, 2011 Everything points to the required density of baryons (neutrons & protons) being a very low percentage. This indicates that not all dark matter is baryonic. That is my understanding. Link to comment Share on other sites More sharing options...
steevey Posted June 6, 2011 Share Posted June 6, 2011 what about this? http://news.yahoo.com/s/afp/20110527/sc_afp/australiaastrophysicsscience Link to comment Share on other sites More sharing options...
IM Egdall Posted June 6, 2011 Share Posted June 6, 2011 what about this? http://news.yahoo.co...ophysicsscience The article refers to "ordinary" barionic matter, not dark matter. Link to comment Share on other sites More sharing options...
Moontanman Posted June 6, 2011 Share Posted June 6, 2011 what about this? http://news.yahoo.com/s/afp/20110527/sc_afp/australiaastrophysicsscience A cool link, i didn't know there was missing baryonic matter, cool to know for sure. Link to comment Share on other sites More sharing options...
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