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  1. Alfredo Tifi

    B Dark matter is "normal" matter in black holes?

    Thank you Janus. I really appreciated your perfectly convincing arguments. So now two options only remain open: a) dark matter exists; b) relationship between mass and gravitational field has to be corrected (Scientific American article "Is Dark Matter Real?", by Sabine Hossenfelder and Stacy S...
  2. Alfredo Tifi

    B Dark matter is "normal" matter in black holes?

    The reading is from Scientific American article "Is Dark Matter Real?", by Sabine Hossenfelder and Stacy S. McGaugh, August 2018 (published in December in the Italian version).
  3. Alfredo Tifi

    B Dark matter is "normal" matter in black holes?

    Do we know the "tiny" ratio of black hole mass to total mass in the milky galaxy? How do we measure the mass of other galaxies' black holes?
  4. Alfredo Tifi

    B Dark matter is "normal" matter in black holes?

    I read that 1. dark matter has to be concentrated in galaxies; 2. McGaugh & Co discovered a precise relationship between visible-ordinary matter and the calculated sum of ordinary + dark matter from thorough observation of actual acceleration of more than 150 galaxies. 3. First experiments to...
  5. Alfredo Tifi

    B Inertia and Mach's Principle

    Since Max Jammer and late Einstein I get the idea that absolute rotation in an empty space (that is relative to nothing) does make sense. Am I still wrong?
  6. Alfredo Tifi

    B Inertia and Mach's Principle

    So, if Wheeler is right, the result of another thought experiment: an unfolding Newton's bucket in a completely flat universe, is that water in it does not rise. Rotation, even rotation relatively to the unfolding rope, should be equivalent to rest. Inertia would be completely absent. Am I right?
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