The concept by Andrey Katz and others published May 23rd in Physical Review Letters is an interesting theory designed to account for the 'missing' source of gravity keeping spinning galaxies from flying apart. The regular mass of galaxies generally isn't sufficient to keep them together. Such facts make it seem like no surprise that the omega factor of mass in the Universe is dubious- Enough mass to make Universal mass collapse toward a Big Crunch although close-on the basis of observable mass - seems to be insufficient after the 1990's determination that the expansion of the Universe is accelerating. If there were much more unobserved 'dark' matter one would think that the Universe should be slowing down or reversing toward a Big Crunch.
Dark-Disk Universe
JiJi Fan, Andrey Katz, Lisa Randall, and Matthew Reece
Phys. Rev. Lett. 110, 211302 (2013)
http://physics.aps.org/synopsis-for/print/10.1103/PhysRevLett.110.211302
http://prl.aps.org/abstract/PRL/v110/i21/e211302
http://www.space.com/21508-dark-matter-atoms-disks.html
It is of course difficult to be entirely accurate about cosmological theory and it's logic these days especially for those of us that are house painters, writers or file clerks. If there is a lot of undiscovered dark matter keeping galaxies together as hidden sources of gravity the stuff of the Universe should be much more. Dark matter doesn't seem to exist or interact with anything except the space-time field. Hopefully untaxed and possible unregulated dark matter isn't some sort of counter-intuitive time reversing subversive agent of forward progress.
Yet dark energy is also believed to exist as a kind of anti-gravity that pushes space into increased expansion. If there are cosmological constants they must be of a qualitative rather than a quantitative kind for new dark energy and mass. Does such new dark matter and dark energy mean fine-tuning values are off? Was dark energy factored into Einstein's field equations of General Relativity?
I wonder why dark atoms of a dark-disc universe aren't evident on Earth? Regular mass is certainly present, yet if unknown dark atoms exist there should be dark objects, dark planets and dark stars if the dark matter can form. Without dark star novas one wouldn't think complex dark mass would be produced through the dark fusion parallel of normal matter. Dark matter existing in a separate but equal form would still need to interact with regular mass enough to keep the aforementioned galaxies together.
So dark matter cannot be entirely segregated - it must share the water fountains of a Jim Crow Universe in some way to help compile the total gravitational field of any given galaxy. The galactic city has all these undocumented workers of force in a complex, invisible to us, alternate part of the Universe.
One can hypothesize about dark matter in addition to light matter, yet the determination of its potential for being extra crunchy or not is up in the air. One can hypothesize that Dirac, Pauli Weinberg and Heisenberg didn't get all quantum field mapped out well enough and that maybe space isn't really warped-its just the way mass interacts that seems to be warped space.
I have no idea how much of the Universe has dark matter or if it's development of structures would be equal to that of normal mass and galaxies. Perhaps dark matter has just a comparative portion of the wealth of mass and power of the non-dark elites and cannot form it's own structures but just 'trickles up' it's gravitational power to let our Universe have a reasonable standard of living. Well, sacrifices must sometimes be made for the good of the power majority.
Seriously though the interesting connection between hypothetical dark matter is the at the core of the inquiry. It may be some kind of unknown small particle like a graviton that drifts about looking from a cold, dark Universe into the window of a warm, convivial dinner party of regular mass. Alternately it could be that space isn't warped by mass, and instead gravity affects only mass in complex ways unknown to present theorists. That is, mass acts upon mass and space is simply the volume in which mass exists. Space however has no quantifiable physical characteristics.
Dark-Disk Universe
JiJi Fan, Andrey Katz, Lisa Randall, and Matthew Reece
Phys. Rev. Lett. 110, 211302 (2013)
http://physics.aps.org/synopsis-for/print/10.1103/PhysRevLett.110.211302
http://prl.aps.org/abstract/PRL/v110/i21/e211302
http://www.space.com/21508-dark-matter-atoms-disks.html
It is of course difficult to be entirely accurate about cosmological theory and it's logic these days especially for those of us that are house painters, writers or file clerks. If there is a lot of undiscovered dark matter keeping galaxies together as hidden sources of gravity the stuff of the Universe should be much more. Dark matter doesn't seem to exist or interact with anything except the space-time field. Hopefully untaxed and possible unregulated dark matter isn't some sort of counter-intuitive time reversing subversive agent of forward progress.
Yet dark energy is also believed to exist as a kind of anti-gravity that pushes space into increased expansion. If there are cosmological constants they must be of a qualitative rather than a quantitative kind for new dark energy and mass. Does such new dark matter and dark energy mean fine-tuning values are off? Was dark energy factored into Einstein's field equations of General Relativity?
I wonder why dark atoms of a dark-disc universe aren't evident on Earth? Regular mass is certainly present, yet if unknown dark atoms exist there should be dark objects, dark planets and dark stars if the dark matter can form. Without dark star novas one wouldn't think complex dark mass would be produced through the dark fusion parallel of normal matter. Dark matter existing in a separate but equal form would still need to interact with regular mass enough to keep the aforementioned galaxies together.
So dark matter cannot be entirely segregated - it must share the water fountains of a Jim Crow Universe in some way to help compile the total gravitational field of any given galaxy. The galactic city has all these undocumented workers of force in a complex, invisible to us, alternate part of the Universe.
One can hypothesize about dark matter in addition to light matter, yet the determination of its potential for being extra crunchy or not is up in the air. One can hypothesize that Dirac, Pauli Weinberg and Heisenberg didn't get all quantum field mapped out well enough and that maybe space isn't really warped-its just the way mass interacts that seems to be warped space.
I have no idea how much of the Universe has dark matter or if it's development of structures would be equal to that of normal mass and galaxies. Perhaps dark matter has just a comparative portion of the wealth of mass and power of the non-dark elites and cannot form it's own structures but just 'trickles up' it's gravitational power to let our Universe have a reasonable standard of living. Well, sacrifices must sometimes be made for the good of the power majority.
Seriously though the interesting connection between hypothetical dark matter is the at the core of the inquiry. It may be some kind of unknown small particle like a graviton that drifts about looking from a cold, dark Universe into the window of a warm, convivial dinner party of regular mass. Alternately it could be that space isn't warped by mass, and instead gravity affects only mass in complex ways unknown to present theorists. That is, mass acts upon mass and space is simply the volume in which mass exists. Space however has no quantifiable physical characteristics.
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