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BartoszMilewski's profile
Bartosz Milewski
Bartosz Milewski
Bartosz Milewski
@BartoszMilewski

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Bartosz Milewski

@BartoszMilewski

Physicist, software engineer (Haskell, C++), mathematician, category 'tourist,' writer, popularizer. Author of Category Theory for Programmers.

Seattle, WA
bartoszmilewski.com
Joined November 2008

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    1. John Carlos Baez‏ @johncarlosbaez 6 Nov 2018

      Slowly lower yourself toward the event horizon of black hole. As you do, look up. Your view of the outside universe will shrink to a point - and become brighter and brighter, tending to infinite brightness! Andrew Hamilton made this: http://jila.colorado.edu/~ajsh/insidebh/schw.html …pic.twitter.com/9mGPnnvNq9

      9 replies 25 retweets 87 likes
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    2. John Carlos Baez‏ @johncarlosbaez 6 Nov 2018

      These effects don't happen if you simply let yourself fall in to the black hole. If you do that, your view of the outside world will not shrink to a point, and the light you see will not be intensified by blueshifting - because you'll be falling along with it!

      2 replies 6 retweets 19 likes
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    3. Bartosz Milewski‏ @BartoszMilewski 6 Nov 2018
      Replying to @johncarlosbaez

      What happens to the external Universe? Do you see it aging faster and faster as you approach the horizon? Do you see the death of the Universe?

      1 reply 0 retweets 6 likes
    4. John Carlos Baez‏ @johncarlosbaez 6 Nov 2018
      Replying to @BartoszMilewski

      If you blast your rockets to keep hovering slightly above the horizon, you'll see time passing rapidly in the rest of the Universe, and the sky will be crunched into a small disk.

      2 replies 0 retweets 3 likes
    5. Bartosz Milewski‏ @BartoszMilewski 6 Nov 2018
      Replying to @johncarlosbaez

      But how rapidly will it pass? Will you see external time go to infinity in the finite amount of your proper time?

      1 reply 0 retweets 1 like
    6. John Carlos Baez‏ @johncarlosbaez 6 Nov 2018
      Replying to @BartoszMilewski

      You replied to a comment where I was discussing the scenario where you hover a certain distance above the event horizon. In this scenario you see external time passing at a certain fixed rate. As the distance goes to zero, this rate goes to infinity.

      1 reply 0 retweets 1 like
      Bartosz Milewski‏ @BartoszMilewski 7 Nov 2018
      Replying to @johncarlosbaez

      Here's a crazy idea: the Void type in Haskell represent False in logic, but it's not empty--it contains bottom, which is a never ending computation. So we cannot prove False in finite time. But if we fall into the black hole, we'll see the proof of False when crossing the horizon

      8:23 AM - 7 Nov 2018
      • 3 Retweets
      • 41 Likes
      • ★ Filippo Mariotti Raul Raja borar ivano.pagano ☮ David Barri ☮ Tuan Le Mark Hopkins Joseph Cox
      4 replies 3 retweets 41 likes
        1. Bartosz Milewski‏ @BartoszMilewski 7 Nov 2018
          Replying to @BartoszMilewski @johncarlosbaez

          Not only physics breaks down inside a black hole--logic does too!

          0 replies 0 retweets 8 likes
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        1. schrepfler‏ @schrepfler 7 Nov 2018
          Replying to @BartoszMilewski

          pic.twitter.com/CAOqJOId5p

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        2. Rúnar‏ @runarorama 7 Nov 2018
          Replying to @BartoszMilewski @johncarlosbaez

          This should tell you something about the soundness of the idea of black holes

          0 replies 0 retweets 7 likes
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        2. Dan Piponi  💉 ⏳‏ @sigfpe 7 Nov 2018
          Replying to @BartoszMilewski @johncarlosbaez

          Bit bemused by this. When I look at a Penrose diagram for a Schwarzshild spacetime I don't see any route into a black hole where I get to see infinitely far into the future

          1 reply 0 retweets 2 likes
        3. John Carlos Baez‏ @johncarlosbaez 7 Nov 2018
          Replying to @sigfpe @BartoszMilewski

          You don't get to see infinitely far into the future if you fall into a black hole. But that's not what we're talking about. We're talking about hovering a tiny bit over the horizon. Gravitational time dilation goes to infinity as you approach the horizon.

          1 reply 0 retweets 0 likes
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