Beaconator
Valued Senior Member
Ummmm…. ….
What does "ummmm" mean?
Stars are created by fusion. We don't know what dark matter or dark energy is. What is your actual point or "revelation"?
I’m just a simpletonWhat does "ummmm" mean?
Stars are created by fusion. We don't know what dark matter or dark energy is. What is your actual point or "revelation"?
rapid neutron capture in exploding supernova is usually the mechanism for production of elements heavier than Iron. those beyond Uranium have decayed out, so we only observe the longer-lived elements such as U-235 and U-238, Pb isotopes, etc. the high neutron environment from rapid fusion in the center of the exploding star allows for rapid build-up of the heavier elements. it's a whole field to study that. i like the idea that if the relative abundance of U-235 and U-238 were roughly 50%-50%, then we can date when that supernova occurred to create our earth's uranium, since they both decay at known rates to give the current relative abundances. solving those two equations with two unknowns yields about 8 billion years ago.How do you account for the elements above iron?
Percentage iron PI
Of course the overwhelming majority of beaconator's posts are gibberish but this one thing got me thinking.We don’t know how fast heat or cold dissipates because of dark matter.
The technical definition of temperature is the average kinetic energy of a volume of particles, so it doesn't have to have anything to do with IR absorption/emission.Of course the overwhelming majority of beaconator's posts are gibberish but this one thing got me thinking.
Since dark matter does not appear to interact with EM radiation, that would mean it does not absorb or emit infrared radiation so does the concept of temperature even apply to dark matter?
True. However, it also raises the question of how an ensemble of dark matter entities can exchange energy so as to come to a Boltzmann distribution. Can they repel one another electrostatically if they don’t interact with an EM field? After all, electrostatic interactions are mediated by virtual photons, aren’t they? So without that, how can they “collide” ?The technical definition of temperature is the average kinetic energy of a volume of particles, so it doesn't have to have anything to do with IR absorption/emission.
Thinking about this a bit more, since dark matter doesn't clump, that is, it doesn't interact with other dark matter or normal matter temperature is not really defined for single particles.The technical definition of temperature is the average kinetic energy of a volume of particles, so it doesn't have to have anything to do with IR absorption/emission.
When you say it doesn’t clump, it has mass and responds to gravitation, since it is concentrated in galaxies.Thinking about this a bit more, since dark matter doesn't clump, that is, it doesn't interact with other dark matter or normal matter temperature is not really defined for single particles.
Cross posted with exchemist.
Right, but I am saying dark matter particles don't make 'dark matter molecules' or 'dark matter crystals'.When you say it doesn’t clump, it has mass and responds to gravitation, since it is concentrated in galaxies.
Indeed, because both chemical bonding and Van der Waals forces come from electrostatic interactions - and dark matter does not do EM interactions, apparently. But you can have a temperature in a monatomic gas in which both are absent or virtually so, as long as you have collisions to distribute k.e. into a Boltzmann distribution.Right, but I am saying dark matter particles don't make 'dark matter molecules' or 'dark matter crystals'.
God could have been the first chemist to make himself both explode and implode at the same time…rapid neutron capture in exploding supernova is usually the mechanism for production of elements heavier than Iron. those beyond Uranium have decayed out, so we only observe the longer-lived elements such as U-235 and U-238, Pb isotopes, etc. the high neutron environment from rapid fusion in the center of the exploding star allows for rapid build-up of the heavier elements. it's a whole field to study that. i like the idea that if the relative abundance of U-235 and U-238 were roughly 50%-50%, then we can date when that supernova occurred to create our earth's uranium, since they both decay at known rates to give the current relative abundances. solving those two equations with two unknowns yields about 8 billion years ago.
Scroll up first.When you say it doesn’t clump, it has mass and responds to gravitation, since it is concentrated in galaxies.