If light has no mass, how is it affected by black holes?

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  • This topic has 48 replies, 1 voice, and was last updated 3 weeks ago by Anonymous.
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    • #77456
      Anonymous
      Guest

      If light has no mass, how the fuck are they affected by black holes?

      I thought gravity only works if a thing has mass

    • #77457
      Anonymous
      Guest

      spacetime is curved so much the path of the light curves back on itself

      • #77459
        Anonymous
        Guest

        >muh spacetime
        do you realize how retarded that sounds

        • #77461
          Anonymous
          Guest

          Whats your answer then?

        • #77462
          Anonymous
          Guest

          then what instead? are you saying einstein is wrong?

          • #77493
            Anonymous
            Guest

            maybe he was
            why do you think it’s called a theory

        • #77463
          Anonymous
          Guest

          That makes sense though.

          Space gets bent by black holes and stars, anything with mass, etc.

          And light doesn’t have mass but it moves along space and so if the space is bent around the black hole, the light will also get bent around the black hole (which is exactly what happens in real life). Light gets bent by planets too, (but less than black hole of course). It gets warped in correlation with the intensity of the gravity (really makes you think).

          Although Einstein’s theory is really good, it still fails to describe the movement of galaxies (unless there is "dark matter" which is potentially true, but unconfirmed).

          • #77475
            Anonymous
            Guest

            Newtonian gravity also predicts lensing without any spacetime curving.

          • #77500
            Anonymous
            Guest

            > fails to describe the movement of galaxies
            Completely wrong. General Relativity has never been disproved at those scales. It accurately describes the motion of galaxies which is why we know dark matter is there.

      • #77471
        Anonymous
        Guest

        >spacetime is curved so much the path of the light curves back on itself
        But there is an inbound and an outbound Curve if it passes the black hole. Why did that not nullified the bend?

    • #77458
      Anonymous
      Guest

      >I thought
      doubt it

    • #77460
      Anonymous
      Guest

      Read up on gravitational lensing

    • #77464
      Anonymous
      Guest

      Because the light keeps moving in a straight line along a curved spacetime giving

    • #77465
      Anonymous
      Guest

      >I thought gravity only works if a thing has mass
      Nope. Gravity refers to the field which determines the geometry of space (metric tensor field). The action for the EM field is not a topological one – it depends on this geometry.

    • #77466
      Anonymous
      Guest

      Light has no REST mass. How do you think solar sails work?

      • #77474
        Anonymous
        Guest

        >How do you think solar sails work?
        Methink they work on solar wind.

        • #77478
          Anonymous
          Guest

          Wrongo

          • #77485
            Anonymous
            Guest

            >Wrongo
            Why

            • #77487
              Anonymous
              Guest

              The pressure of light pushes them. Solar wind is not light.

              • #77503
                Anonymous
                Guest

                This only repeats the claim, is /sci a church?

    • #77467
      Anonymous
      Guest

      Why the fuck can’t you just google your retarded question instead of pooping up the board?

    • #77468
      Anonymous
      Guest

      Gravity doesn’t physically exist in our dimension it exists in the 4th dimension, and as an up or down gradient is to 2 dimensional beings, gravity is to our 3 dimensional space.

    • #77469
      Anonymous
      Guest

      You can derive black holes even in Newtonian gravity. Escape velocity is sqrt(2GM/r), where M is the mass of the body you are escaping from. It doesn’t depend on the mass of the body that is escaping. If M gets so big that the escape velocity exceeds c, then you have a black hole.

    • #77470
      Anonymous
      Guest

      Black hole doesn’t attract photon. It bend the photon container(aka space-time) therefore the photo got pulled into the black hole.

    • #77472
      Anonymous
      Guest

      Photons have no rest mass but since they’re moving with light speed, they acquire mass through relativistic mechanics. Since [math]v=0[/math] in equation for relativistic mass, the result is [math]frac{0}{0}[/math]. I think they resolve it by using l’Hopital’s rule of something.

      • #77473
        Anonymous
        Guest

        no. photon’s mass = 0
        read a book

        • #77477
          Anonymous
          Guest

          No, you’re wrong.

    • #77476
      Anonymous
      Guest

      What makes gravity different from EM? Why can’t I say EM is a feature of spacetime geometry?

      • #77495
        Anonymous
        Guest

        Well, any energy or mass as an excitation like a particle in a field will also bend spacetime, of course it would have next to no affect on anything.

    • #77479
      Anonymous
      Guest

      this thread is mind numbing to LULZ as 1 kilogram of steel vs 1 kilogram of feathers

      i’m not pooping you

      explaining that gravity doesn’t attract mass, just that anything that moves through space-time follows space-time’s curves and gravity is just space-time curvature… is not something we should have to keep doing over and over

      people need to learn this one god damn time and not forget

      fuck

    • #77489
      Anonymous
      Guest

      It’s pretty clear that despite what mainstream physics says, photons must be particles with mass.

      I derived the mass of a photon in this paper here:
      https://vixra.org/abs/2102.0169

      It also turns out that if you calculate the distance at which two photons in their minimum energy state escape each other’s gravitational attraction, you can use this to calculate the number of cavitation modes in radiating black-bodies. This demonstrates the relationship between gravity and quantum mechanics. (You can find that calculation in the same paper.)

      I also discuss the issues with the Michelson-Morley experiment (which led to relativity, and the erroneous belief that photons are massless) in more depth here:
      https://vixra.org/abs/2103.0149

      • #77490
        Anonymous
        Guest

        >cavitation modes in radiating black-bodies

        We’re going to need some elaboration here, because this sounds like some shit a DC super villain would say, while developing a weapon to destroy metropolis.

        • #77494
          Anonymous
          Guest

          As objects are heated, they emit radiation at certain frequencies, forming a particular distribution. See this link for example:
          http://hyperphysics.phy-astr.gsu.edu/hbase/mod6.html

          The blackbody radiation curve was one of the original observations that required quantum mechanics to explain. You can read more about the ultraviolet catastrophe here: https://en.wikipedia.org/wiki/Ultraviolet_catastrophe

          Generally, the derivation of the number of cavity modes at a particular frequency (which determines the shape of the distribution) requires some complicated and hand-wavy statistical arguments.

          However, I show in my paper that you can explain this quantum-mechanical effect by assuming that photons have mass, and calculating how far away from each other they need to be to exist as separate particles.

          • #77498
            Anonymous
            Guest

            I just wanted to say its nice to have a man of science here.

            • #77504
              Anonymous
              Guest

              Thanks anon 🙂

    • #77491
      Anonymous
      Guest

      […]

      >Yet what does Hawking Radiation do after it radiates?
      Hawking radiation emission time is proportional to the cube of the mass of the black hole.

    • #77497
      Anonymous
      Guest

      >Implying is hard to change light path

      • #77502
        Anonymous
        Guest

        retard

    • #77499
      Anonymous
      Guest

      >If light has no mass, how the fuck are they affected by black holes?
      the same way the observable universe is moving away from us, when you stretch space at extremes it becomes impossible for light to ever ‘reach’ a place. in a black hole space stretches faster than light can traverse across the hole.

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