- Professor Beetus
- Apr 12, 2007
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They can fight us
But they'll never Beetus
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Perhaps it is more likely that both countries have continued to develop spy and electronic warfare systems and neither will admit it?
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Jun 21, 2023 16:53
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May 17, 2024 15:41
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- Professor Beetus
- Apr 12, 2007
-
They can fight us
But they'll never Beetus
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JWST has detected objects consistent with interpretation as
dark stars,
the size of supermassive black holes, dating from a few hundred million years after the Big Bang.
https://www.livescience.com/physics...ive-dark-matter
https://arxiv.org/pdf/2304.01173.pdf
I had never heard of these hypothetical objects until recently. Here's the general idea: Supersymmetry (which has no real empirical evidence as of yet) predicts particles called "neutralinos," the lightest of which is an good candidate a good candidate for a weakly interacting massive particle (WIMP) explanation of dark matter. These hypothetical neutralinos are Marjona fermions, which are fermionic superpartners of gauge and/or Higgs bosons. Unlike standard (anti-) matter, they are their own antiparticles, and so self-annihilate (this is because they have real-valued wave functions, whereas regular fermionic particles and anti-particles have complex ones related by conjugation). These particles could conceivably form the majority of the mass of the universe as dark matter, but only diffusely - such that the timescales of annihilation of the diffusely scattered particles are greater than the current age of the universe. In this scenario, most of the original dark matter may have already annihilated (most soon after the Big Bang), explaining that most of the energy-mass of the universe is dark energy (I might be wrong about this).
Dark stars are objects that could have existed in the early universe under this scenario. They would have mostly been made up of normal matter by this point in the Universe's history, but would have had some neutralino dark matter. Also, they wouldn't have been dark - instead of fusion, they would create energy from neutralino annihilation. Nowadays, such supermassive clumps of matter would immediately collapse into black holes. The radiation pressure from fusion, or degeneracy pressure is not sufficient to prevent collapse. However, the annihilation of these neutralinos would provide enough pressure to prevent this. There could have also been normal stellar-sized dark stars, which would have densified and started to undergo fusion after the neutralinos were exhausted.
Dark stars also aren't dark. They would emit a fuckton of radiation but be cooler and less dense overall. This result is not confirmed as of yet. The smoking gun would be a helium absorption line, rather than an emission line, at a particular wavelength. If true, this would have some pretty big implications in fundamental physics as well as being loving nuts.
Hi-dilly-ho, neutralinos!
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Jul 20, 2023 02:48
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- Professor Beetus
- Apr 12, 2007
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They can fight us
But they'll never Beetus
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Gotta admit seeing it phrased out this way kinda makes it that much more awe-inspiring that we have rudimentary communications with something in interstellar space, that we launched in the 1970s.
That thing's operational capacity might very well outlast our own.
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Aug 2, 2023 05:35
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Jun 21, 2023 16:53
