Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I Blackhole creation at near light speed?

  1. Jan 26, 2017 #1
    Yesterday, I attended the following presentation by Prof. Andrea Ghez.

    https://www.meetup.com/physicists/events/236886090/?gj=co2&rv=co2

    In the Q&A session towards the end, there was a question she fumbled to give a proper answer.

    She mentioned that as long as the mass is compressed into within the Schwarzschild radius, any mass could turn into a black hole.
    She gave the exact presentation as in .
    See between 8:10-9:00.

    The question from the audience was, if an object travels at near speed of light, the mass increases, volume reduces. So, will a near light moving object create a black hole?

    https://www.quora.com/Relativity-physics-Does-relativistic-mass-have-gravity
    says the relativistic mass does have gravity.
     
  2. jcsd
  3. Jan 26, 2017 #2

    ZapperZ

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    And this, boys and girls, is why we no longer use the concept of "relativistic mass".

    Zz.
     
  4. Jan 26, 2017 #3

    Ibix

    User Avatar
    Science Advisor

  5. Jan 26, 2017 #4
  6. Jan 26, 2017 #5

    Orodruin

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member
    2017 Award

    First of all, any attempt at trying to deal with a black hole mixing concepts of special relativity and "mass based" gravity is doomed. Black holes cannot be described in the flat spacetime of SR, nor is mass the source of spacetime curvature in GR - the stress energy tensor is.

    Second, as already mentioned, relativistic mass has been the cause of probably almost as many misunderstandings of SR as the relativity of simultaneity. It is also an archaic concept that is not really used by practicing physicists.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted