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There is an imbalance of matter/anti-matter so why should there be equal amounts of matter & exomatter? If matter is predominant then the plates will still get closer.

Surely if there was some negative energy exomatter component at work, the equations would not be as accurate as they are?

Negative mass? Negative energy? That's waaaay beyond the capabilities of my poor little brain []

Quote from: DoctorBeaver on 13/07/2008 23:32:08Negative mass? Negative energy? That's waaaay beyond the capabilities of my poor little brain []Think about it in terms of concept and consequences, as opposed to how it melds with common sense. Analogies help, too. If a positive mass bends the "lines" of space-time towards itself, you might think of a negative mass as bending the "lines" space-time away from itself. Likewise, a beam of light will be bent towards a positive mass, and away from a negative mass.I've also seen it suggested that matter and exomatter could meet and annihilate to produce nothingness, since a positive number and a negative number can cancel out to make zero. In theory, that is possible, but only in certain circumstances. Conservation laws would prevent certain kinds of annihilations. For example, you couldn't annihilate an electron and an exotic electron because there would be nothing left behind to carry the negative electric charge that they had (or their lepton number). However, you could annihilate a positron and an exotic electron (or conversely, an electron and an exotic positron) because their electric charges and lepton numbers would cancel out.I also wonder about the consequences of the gravitational field surrounding a negative mass/exomatter. Since time slows down in a strong gravitational field, what would happen in the "antigravitational" field surrounding a sphere of exomatter? Would time speed up? Would it run backwards? Would it slow down just like in a regular gravitational field?

If this is the case, then could the existence of the Casimir Effect in our Universe be seen as proof that there are no virtual exoparticles within the quantum vacuum fluctuations to cancel out the pressure of the normal virtual particles? If they don't exist in these fluctuations, then doesn't that mean that they don't exist anywhere in our Universe at all?

Electromagnetic radiation can be pictured as waves flowing through space at the speed of light. The waves are not waves of anything substantive, but are ripples in a state of a theoretically defined field. However these waves do carry energy (and momentum), and each wave has a specific direction, frequency and polarization state. Each wave represents a ''propagating mode of the electromagnetic field.'' Each mode is equivalent to a harmonic oscillator and is thus subject to the Heisenberg uncertainty principle. From this analogy, every mode of the field must have 1/2 hf as its average minimum energy. That is a tiny amount of energy in each mode, but the number of modes is enormous, and indeed increases per unit frequency interval as the square of the frequency. The spectral energy density is determined by the density of modes times the energy per mode and thus increases as the cube of the frequency per unit frequency per unit volume. The product of the tiny energy per mode times the huge spatial density of modes yields a very high theoretical zero-point energy density per cubic centimeter.