Gravitational waves have been discovered

Discussion in 'World News & Debates' started by Eutychius, Feb 11, 2016.

  1. F.E.A.R.0

    F.E.A.R.0 Well-Known Member

    Take a Black Hole as an example.

    The closer you are to a Black Hole, the slower time passes for you.

    So let's say that you get out of the Black Hole. When you return to Earth, a century has passed while you were next to the Black Hole.
     
  2. DrFrank_

    DrFrank_ Well-Known Member

    I'm assuming that the recent news proved it physically, rather than it simply being conjecture, or am I misunderstanding the news?
     
  3. Ety

    Ety Well-Known Member

    We already have a perfectly fine example with satellites orbiting Earth. The GPS systems and clocks have to be constantly synchronized by taking into account tiny yet measurable time dilations experienced by the satellites, although most of the time dilation comes from them moving at high speeds relative to us rather than by the fact of being farther away from Earth's center of mass.
     
  4. Eutychius

    Eutychius Moderator

    I'm afraid this will do very little if not anything to help unify quantum mechanics with gravity. We need the graviton for that.

    Not exactly. This is the very first 100% verified confirmation of gravity waves detected.

    There is a huge amount of issues unsolved and a lot more urgent than that.


    General relativity is a big body of work that revolves around certain equations. The main part is about the hypothesis that massive objects (actually, more accurately with energy and momentum) bend spacetime around them and gravity is the result of spacetime "pushing you" and bending the direction of moving objects around it.

    The main parts have been verified numerous times in the past and GRT was known to be basically valid decades ago. One such verification is the way we see earth's shadow on the moon during an eclipse.

    One year after Einstein published his papers, there was one thing that derived from his equations which was that spacetime can also have ripples and cause waves because of gravitational interaction (such as 2 objects orbiting around eachother). This was unverified up until now. Now we have successfully detected that yes, gravitational waves do exist. Einstein's equations are right in that regard as well.
     
  5. DrFrank_

    DrFrank_ Well-Known Member

    ^Amazing. Thanks for the info all [noparse]:)[/noparse]
     
  6. Blarrg

    Blarrg Well-Known Member

    For any confused on how to visualize what was actually discovered:


    First, think of a trampoline, and you place a bowling ball in the middle and it sinks the trampoline down. The trampoline is space while the bowling ball can be any object in space. The curvature of the trampoline represents gravity, if you were to roll marbles across the trampoline, they would start rolling around the ball due to the curvature, making an orbit.

    Now, think of a pool of water. Think of what it looks like if you were to take a beach ball and lightly bounce it on the surface of the water, ripples of water. Now imagine what the ripples would look like if you were to move the beach ball along the surface, that is basically what is discovered.

    This rippling effect caused by orbiting objects combined with the trampoline effect caused by masses is what general relativity predicts how spacetime works.


    These ripples were quite easy (for physicists) to show that they existed, but extremely difficult to actually observe, since most masses simply don't make ripples large enough for our sensors to detect.