Black holes ruled out as universe’s missing dark matter

Oct 2, 2018

By the University of California – Berkeley

For one brief shining moment after the 2015 detection of gravitational waves from colliding black holes, astronomers held out hope that the universe’s mysterious dark matter might consist of a plenitude of black holes sprinkled throughout the universe.

University of California, Berkeley, physicists have dashed those hopes.

Based on a statistical  of 740 of the brightest supernovas discovered as of 2014, and the fact that none of them appear to be magnified or brightened by hidden black hole “gravitational lenses,” the researchers concluded that primordial  can make up no more than about 40 percent of the  in the universe. Primordial black holes could only have been created within the first milliseconds of the Big Bang as regions of the universe with a concentrated mass tens or hundreds of times that of the sun collapsed into objects a hundred kilometers across.

The results suggest that none of the universe’s dark  consists of heavy black holes, or any similar object, including massive compact halo objects, so-called MACHOs.

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One comment on “Black holes ruled out as universe’s missing dark matter”

  • Meanwhile there is other information on the properties of black holes, which suggests that over time, some mass/energy may be being lost from black holes!

    https://www.bbc.co.uk/news/science-environment-45826748

    Stephen Hawking’s final scientific paper has been released, and it deals with one of the central topics in the physicist’s 56-year-long career.

    The work was completed in the days before Hawking’s death in March.

    It tackles the question of whether black holes preserve information on the stuff that falls into them.

    Some researchers had believed this information was destroyed, but others said that this violated the laws of quantum mechanics.

    These laws propose that everything in our world can be broken down into information, for example, a string of 1s and 0s. In addition, this information should never disappear, not even if it gets sucked into a black hole.

    But Hawking, building on the work of Albert Einstein, showed that black holes have a temperature. And because hot objects lose heat into space, black holes must eventually evaporate – disappearing from existence.

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