Dark Energy: The problem with Einstein's Cosmological Constant is that there's no physics behind it
in [Physics]
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From: rick_s on 3 Jun 2010 15:00 In article <af9a0a03-33f4-4197-9057-6eb0cf9ac170(a)k17g2000pro.googlegroups.com>, yjkhan(a)gmail.com says... > > >This link is a bit of a long read, and a bit terse at times. But he is >describing a quantum-gravity theory that could explain the mechanisms >behind Dark Energy, but the Cosmological Constant cannot. > > Yousuf Khan > >*** >Toward Quantum Gravity? Discrete Space, Dark Energy And the Real >Line : NPR >"But the Cosmological Constant has remerged as a start to account for >Dark Energy. With it, one can achieve an accelerating expansion of the >universe. The Cosmological Constant is as if there were a �repulsive >force� in space, pushing any two regions of space further apart, and >the more so as their distance apart increases. > >Einstein realized that his Cosmological Constant implied an increasing >energy in the expanding universe, such that the vacuum energy per unit >volume remained constant. This flies in the face of the Big Bang >belief that all the energy of the universe came to exist in that >Bang. Well, OK, so it does. > >The problem is, there is, in a deep sense, no physics behind the >Cosmological Constant, it is just a constant added the only place >Einstein could in his equations and keep the rest of the physics of >General Relativity unmodified. " >http://www.npr.org/blogs/13.7/2010/05/28/127234796/discrete-space-dark-energy- and-the-real-line-toward-quantum-gravity That's not true at all. It is just kept secret. I will bet there are a hundred people in this group that understand the physics behind dark energy. Is magnetism dark energy? Yes. Is black body radiation dark energy? Yes. Do all atoms emit both of these? Yes. Is the energy dark or does it emit light? It is dark. Does magnetism repel? Yes at a distance it does. In fact, all it is is wave energy. But its kinetic energy. |