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Dark Matter
Does anyone have any personal theorys on what exactly the dark matter
of the universe is? |
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Dark Matter
Winnifred wrote:
Does anyone have any personal theorys on what exactly the dark matter of the universe is? Either an illusion [1] or matter we haven't spotted yet, like uncounted brown dwarf stars, neutral hydrogen, etc. [1] Regarding the "dark matter is an illusion," some recent models of galactic motion have been able to replicate galactic motion without dark matter using known principles of gravity and general relativity: http://arxiv.org/PS_cache/astro-ph/pdf/0507/0507619.pdf Mike Miller |
#3
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Dark Matter
I'm just an undergrad EE major, but with some serious interest in
space. As to what Dark matter is, well, in my mind, the far more interesting question is, what is dark energy. Dark matter is likely just stuff in the form of small black holes, sub atomic particles, etc, which massively adds up. Dark energy, well, that's just wierd, something's emitting energy that we can't directly see, but affects the gravitational pull of the uniververse... THAT'S something! Winnifred wrote: Does anyone have any personal theorys on what exactly the dark matter of the universe is? |
#4
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Dark Matter
wrote:
[1] Regarding the "dark matter is an illusion," some recent models of galactic motion have been able to replicate galactic motion without dark matter using known principles of gravity and general relativity: http://arxiv.org/PS_cache/astro-ph/pdf/0507/0507619.pdf That work (by Cooperstock and Tieu) assumes a highly implausible model of the galaxy. Notably, Korzynski (http://de.arxiv.org/abs/astro-ph/0508377) and Vogt and Letelier (http://de.arxiv.org/abs/astro-ph/0510750) showed that the Cooperstock-Tieu model necessarily also contains a "domain wall" in the galactic plane (which would have to be made of either cosmic strings or struts with a negative energy density). There's no theoretical or observational support for this. Garfinkle (http://de.arxiv.org/abs/gr-qc/0511082) gives a strong argument that the nonlinearity of general relativity will not solve this problem of the Cooperstock-Tieu model, but instead will make it even worse. Moreover, Cross (http://de.arxiv.org/abs/astro-ph/0601191) argues that the Cooperstock-Tieu model is in fact internally inconsistent, and Fuchs and Phelps (http://de.arxiv.org/abs/astro-ph/0604022) point out that the Cooperstock-Tieu model strongly disagrees with the observed local mass density and vertical density profile of our galaxy. I wouldn't put much stock in the Cooperstock-Tieu model. ciao, -- -- "Jonathan Thornburg -- remove -animal to reply" Max-Planck-Institut fuer Gravitationsphysik (Albert-Einstein-Institut), Golm, Germany, "Old Europe" http://www.aei.mpg.de/~jthorn/home.html "Washing one's hands of the conflict between the powerful and the powerless means to side with the powerful, not to be neutral." -- quote by Freire / poster by Oxfam |
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Dark Matter
Jonathan Thornburg -- remove -animal to reply wrote:
I wouldn't put much stock in the Cooperstock-Tieu model. I don't put much stock in it. I just like the idea that there are alternatives to mysterious dark matter and dark energy. It usually seems that when science has to start invoking such handwavium, the observations are being misinterpreted and there's a simpler answer. Mike Miller |
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Dark Matter
In article . com,
"Tuvas" wrote: I'm just an undergrad EE major, but with some serious interest in space. As to what Dark matter is, well, in my mind, the far more interesting question is, what is dark energy. Dark matter is likely just stuff in the form of small black holes, sub atomic particles, etc, which massively adds up. Dark energy, well, that's just wierd, something's emitting energy that we can't directly see, but affects the gravitational pull of the uniververse... THAT'S something! Winnifred wrote: Does anyone have any personal theorys on what exactly the dark matter of the universe is? My personal theory is that dark matter & energy is stuff that has gone thru a black hole and come out the other side; from (x,y,z,t) to (a,b,c,d). It is a Big Bang in an 'alternate' universe. -- Free men own guns, slaves don't www.geocities.com/CapitolHill/5357/ |
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Dark Matter
Maybe Dark Matter or Dark Energy isnt really dark at all. like the
picture that is too close for our eyes to distiguish color-maybe the darkness we see is something our eye's/brains are not equiped to process. Nick Hull wrote: In article . com, "Tuvas" wrote: I'm just an undergrad EE major, but with some serious interest in space. As to what Dark matter is, well, in my mind, the far more interesting question is, what is dark energy. Dark matter is likely just stuff in the form of small black holes, sub atomic particles, etc, which massively adds up. Dark energy, well, that's just wierd, something's emitting energy that we can't directly see, but affects the gravitational pull of the uniververse... THAT'S something! Winnifred wrote: Does anyone have any personal theorys on what exactly the dark matter of the universe is? My personal theory is that dark matter & energy is stuff that has gone thru a black hole and come out the other side; from (x,y,z,t) to (a,b,c,d). It is a Big Bang in an 'alternate' universe. -- Free men own guns, slaves don't www.geocities.com/CapitolHill/5357/ |
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adult joke30
Code for sexA husband and wife decided they needed to use "code" to indicate that they wanted to have sex without letting their children in on it. They decided on the word Typewriter.One day the husband told his five year old daughter, "Go tell your mommy that daddy needs to type a letter".The child told her mother what her dad said, and her mom responded, "Tell your daddy that he can't type a letter right now cause there is a red ribbon in the typewriter." The child went back to tell her father what mommy said.A few days later the mom told the daughter, "Tell daddy that he can type that letter now."The child told her father, returned to her mother and announced, "Daddy said never mind with the typewriter, he already wrote the letter by hand." Polyaluminum Chloride
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Poly aluminium Chloride |
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