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dark matter
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| can anyone explain dark matter and baryonic matter |
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Re: dark matter
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i know basically what dark matter is but wikipedia explains it much better than i could. http://en.wikipedia.org/wiki/Dark_matter and also for baryonic matter, wikipedia. its actually quite simple, baryonic matter that is. http://en.wikipedia.org/wiki/Baryonic_matter |
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Re: dark matter
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by EricSoLazy
on 2005-06-10 10:41:58
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Well dark matter is matter in the universe that we cant see. When we look at the stars, all we see is stars and planets but a problem arose that all the stars and planets mass in galaxies wasnt enough to create the graviational pull to keep such galaxies together. So Dark matter became the prevailing thoery to answer the question Its basically that there a massive amount of mass around galaxies that we just cant see, such as elementary particles known as WIMPS (Weakly Interactive Massive Particles) or brown dwarfs, black holes, known as MACHOS (MAssive Compact Halo Objects) as for baryons... read the thread Smallest particle. There is a good basic intro to Particle Physics that explans it.
WHOOOOOOOOOOOOOOOOOOOOO
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Re: dark matter
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by EricSoLazy
on 2005-06-13 18:25:18
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I shouldve pointed out the there still is a "great" debate over which if dark matter is nothing but WIMPs or MACHOs or both and looking for signs of either existance is probably second most time consuming job of astromers next to mapping the universe
WHOOOOOOOOOOOOOOOOOOOOO
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Re: dark matter
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As far as i know dark matter is belived to be just planets or asteroids that cant be detected cause they have little gravity and doesnt emit light. About Weakly Interactive Massive Particles i heard theyre highly unstable because of their nature, and high energy, therefore they tend to be short lived. About MACHOS i ve just heard brief explanations And about baryon's degenerate(6th state of matter, masive star composed just of neutrons) i heard they are belived to be pulsars which emits pulses of radio waves and x rays(and as a fun fact they where thought of being alien signals) |
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Re: dark matter
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by EricSoLazy
on 2005-06-13 20:39:18
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planets and asteroids fall under the MACHOs, though planets tend to relect light therfore not dark, also most dark matter is believe to be in a "halo" or "disc" on the edge of galaxies.. why there would be planets out there.. is confusing. WIMPs tend to be stable, protons are very stable, their main problem is the weak interaction to anything else, so it is very hard to detect, there also is Hot dark matter comprised of nuetrinos that travel near speed of light.. these are high energy and not stable but I might be wrong.. all this i know from a paper i wrote 4 years ago and I dont know how well my resreach was back then, or if time distorted the facts in my head
WHOOOOOOOOOOOOOOOOOOOOO
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Re: dark matter
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| WIMPS like protons are stables what i mean is particles of higher energy i dont remember their name, but the most enegy a particle have, the smaller they life span is. |
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Re: dark matter
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by EricSoLazy
on 2005-06-14 18:33:18
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But when the higher energy baryons break down they break down to a proton and a lepton thus becoming stable. The amount of matter stays the same throughout so its good to think of WIMPs as nothing but protons and other stable baryonic matter. There is the super unstable neutrinos but those are not WIMPs or MACHOs
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Re: dark matter
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| My mistake, i tought that high level leptons and quarks fell under wimp clasification. |
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Re: dark matter
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I have a question lets say a proton and a antiproton anihilate each other do they form 3 pions and then they decay into photons or they pass straight to photons? im sarting to wonder if this question has any meaning ahahahah |
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Re: dark matter
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by EricSoLazy
on 2005-06-14 21:33:59
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as far as I thought anitmatter matter collisons form nothing but pure energy.. like a bomb.. heat and photons
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Re: dark matter
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Then they go straight to photons? well it isnt really important since pions life span is very short and they decay into photons anyway |
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Re: dark matter
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| By the way i remembered an article i read a while back, it said that strange matter(formed when a neutron star colapses and is composed of strange quarks) could actually be accountable for the high amounts of dark matter since they are actually giant nucleoids without charge(or act as protons sorrounded by clouds of electrons, then again either way they dont have a net charge) |
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Re: dark matter
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by space cadet
on 2005-07-25 17:06:33
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| Dark matter is undetectable, but still has gravity, it is undetectable because they don't emitt anything at all, what else in the universe is known to share these properties? black holes, one dimensional objects that still have mass. Of course they're somewhat noticable because they have ALOT of mass, so what about 1D objects with alot less mass? on an astronomical level, they would be almost completely invisible and undetectable, see? dark matter. Now if this is true, just think, how many one dimensional objects could be floating around your room right now? Actually don't think about that... It's either an infinate amount or none at all, kinda opposite ends of the scale there. So what I have just said about dark matter is either pretty smart, or just plain dumb, anybody know better? and don't you dare ask why low mass objects would be 1D, they just would be. |