tag:blogger.com,1999:blog-996609237882090723.post411451527670692982..comments2024-01-13T02:28:25.074-04:00Comments on Physicists of the Caribbean: The Universe Is A Great Big Bloody Mess And You Won't Convince Me OtherwiseRhysyhttp://www.blogger.com/profile/13219113442790412792noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-996609237882090723.post-34878140405650400322015-08-20T08:10:08.691-04:002015-08-20T08:10:08.691-04:00The amount of dark matter is thought to remain con...The amount of dark matter is thought to remain constant over time, except for a very small amount which ends up in black holes. One exception would be if dark matter is also its own anti-particle, in which case the amount will be slowly decreasing as it annihilates itself over time. However, I have no idea if the amount by which it decreases is thought to be significant - and of course we still have no idea what dark matter actually is, let alone whether or no it's its own anti-particle.<br />http://profmattstrassler.com/articles-and-posts/relativity-space-astronomy-and-cosmology/dark-matter/dark-matter-annihilation/<br /><br />The effects of dark matter definitely do change over time (I give an example in part one of this trilogy : http://astrorhysy.blogspot.cz/2015/08/what-has-dark-matter-ever-done-for-us.html). For example as dark matter collapses early in the Universe, it draws in normal matter and is thought to be responsible for the large-scale structures we see today - this is one of the model's best predictions. <br />Later on, once most of the gas has collapsed into galaxies, it's still important but in a different way. With not much gas left it becomes less important for forming large structures, but because it's so much more massive than the gas and stars it strongly affects how galaxies interact with one another and their environment.Rhysyhttps://www.blogger.com/profile/13219113442790412792noreply@blogger.comtag:blogger.com,1999:blog-996609237882090723.post-9142132504182109042015-08-20T07:48:23.450-04:002015-08-20T07:48:23.450-04:00Hi, has there been any work done to see if the amo...Hi, has there been any work done to see if the amount of dark matter (or its effects) has changed over time? Perhaps in work on the evolution of galaxies?Nick Riggshttps://www.blogger.com/profile/04949727669816521786noreply@blogger.com