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While reading the recent dark matter thread, an idea came to me. So since this section is for fun stuff, here's the thought:Is it possible that the dark matter we see affecting galaxies could simply be electromagnetic radiation? At first thought, this seems preposterous; but after I dwell upon it some, I see a possibility.If this were true, the radiation would be at a frequency we could not detect via common methods. It would either be too low in frequency, or too high in frequency for our current detectors. We detect high end radiation all the way through gamma radiation and notice that at about .511 MeV two gamma photons can interact to produce a positron and electron. So, it is probably not the high end of the spectrum.What about the low end? We are not usually interested in radiation below the radio spectrum; but we know there's a bunch of it at those lower frequencies. We don't know how much. I don't think there's ever been an attempt to measure it. The frequency would need to be less than about 10 cycles per second or we would pick up a buzz. Suppose it is on the order of one cycle per second or less.Now, there's so much of that stuff out there, and probably right here, if we had a perfectly tuned receiver maybe we could harness some of that energy and convert it to usable power.Edit: Oops; wrong section; but since the referenced thread in in this section, maybe it will work.
even considered that we still haven't experimentally proved the fact that radiation is made of photons
Quote from lightarrowQuoteeven considered that we still haven't experimentally proved the fact that radiation is made of photons I had thought that all electromagnetic radiation was photons. What are photons considered to be?
My main concern for you theory is that extreemly long wavelength radiation has very little energy (since energy is proportional to frequency) and as "dark matter" seems to have many times the mass of "light matter" within our galaxy that would require a huge huge huge source of these low frequency photons. Also if so much of such long wavelength light existed then there would be a noticeable effect of the photons up-scattering off electrons in the galaxy and halo (known as the inverse Compton effect).
When Newton's or Einstein's gravitational theory is applied on galactic and cosmological scales, various anomalies are found: most famously, the orbital speed of stars far from the centre of a galaxy is roughly constant, where the theory predicts that it should fall off with radius r as 1/√r (which, furthermore, appears to happen for at least one galaxy); this is called the anomalous rotation of galaxies. This has traditionally been accounted for by postulating the existence of "dark matter", which we are unable to identify other than by its effect, via gravity, at galactic scales.
incoherent low frequency electromagnetic effects could not produce any effects but coherent ones could.
June 12, 2007Our Milky Way galaxy lies at the edge of a huge void and is being repulsed by the void at high speed. This observation provides astronomers with fundamental insights into how dark matter is distributed and the process of galaxy formation. Brent Tully of the University of Hawaii discussed this discovery at the meeting of the American Astronomical Society in Honolulu, Hawaii.
E = mc2 meaning longer wavelength light (ie lower energy) must have less gravity than higher energy light.