Gravitational collapse

Discussion in 'Physics & Math' started by arfa brane, Jun 18, 2013.

  1. hansda Valued Senior Member

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    I am not saying "lamda" is wrong. I am saying Einstein's idea of "static universe" was wrong, which he later regretted.
     
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  3. Tach Banned Banned

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    You are changing your tune, crackpot.
     
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  5. hansda Valued Senior Member

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    You are trying to change the tune. See my questions in post #277(about "static universe").
     
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  7. Tach Banned Banned

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    Listen, crank

    The original version, as published by Einstein in 1916 contained no mistake. Get it?
     
  8. arfa brane call me arf Valued Senior Member

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    'sigh'

    http://www.astro.ucla.edu/~wright/cosmo_constant.html

    Einstein added the cosmological term on the right hand side of the field equations (i.e. it gets subtracted from the left).
    Modern formulations add the term on the left, so it gets subtracted from the SEM tensor.

    Mistake? What mistake?
     
  9. hansda Valued Senior Member

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    Have you understood my question? You are answering something, which i never asked.
     
  10. Tach Banned Banned

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    You are not only a crank but a liar as well:

    So, once again, crackpot, there is no mistake in Einstein's papers. Live with it.
     
  11. brucep Valued Senior Member

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    The idea that Einstein made a mistake because our universe has a cosmological constant is complete bullshit. We wouldn't have a universe if there was no cosmological constant in this universe. You can't expect Einstein to know everything while building the relativistic model. Just like you can't expect Newton to know that Maxwell's set of equations needed a special transformation equation to insure Maxwell's equation are frame invariant. His prediction for the cosmological constant was born from the wrong assumption that the universe was static. It's amazing how this stuff works out.
     
  12. Layman Totally Internally Reflected Valued Senior Member

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    He was the one that developed his own theory and he put the term for it in the right location. That was a place where it wouldn't effect things on smaller scales like our solar system but then expand on scales outside of our galaxy. I even recently saw a lecture by Lawrence M. Krauss PhD "The Universe from Nothing" where he said that Einstein developed his theory by putting the curvature on the left side and the forces on the right side. As if the pop scientist saying that gravity was equal to curvature was actually true mathematically.
     
  13. eram Sciengineer Valued Senior Member

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    1,875
    He wasn't lying, he was trying to say that your reply to his question "did not follow".

    I think he was referring to Einstein's original inclusion of the cosmological constant, something which Einstein later referred to as his "biggest blunder".



    @hansda, to answer your questions

    1) It was Einstein's personal view that the universe should be static and unchanging.

    2) Observations by Slipher and Hubble showed that the universe was expanding.
     
  14. Tach Banned Banned

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    You obviously do not understand the matter being debated.
     
  15. Cheezle Hab SoSlI' Quch! Registered Senior Member

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    An interesting fact that is sometimes over looked is that (http://en.wikipedia.org/wiki/Georges_Lemaître):
    Monseigneur Georges Henri Joseph Édouard Lemaître, (French: [ləmɛtʁ] ( listen); 17 July 1894 – 20 June 1966) was a Belgian priest, astronomer and professor of physics at the Catholic University of Louvain. He was the first person to propose the theory of the expansion of the Universe, widely misattributed to Edwin Hubble.[1][2] He was also the first to derive what is now known as Hubble's law and made the first estimation of what is now called the Hubble constant, which he published in 1927, two years before Hubble's article.[3][4][5][6] Lemaître also proposed what became known as the Big Bang theory of the origin of the Universe, which he called his 'hypothesis of the primeval atom'.[7]

    It is true that Hubble confirmed the expansion with observations.
     
  16. eram Sciengineer Valued Senior Member

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    Lemaître was a brilliant physicist, but he too was initially dismissed by Einstein.
     
  17. hansda Valued Senior Member

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    I think you still did not understand my questions in the post #277. I am not asking about "Einstein's papers" or "Cosmological Constant - Lambda" or "GR". I am only asking about "Einstein's idea of "static universe"". Now again read my questions in the post#277 and try to answer them, if you can.
     
  18. Tach Banned Banned

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    You are a liar and you keep on lying, you are asking about Einstein purported "mistakes". There are no mistakes, live with it.
     
  19. hansda Valued Senior Member

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    YES, mostly it was his personal view. Without any evidence of 'universal expansion' he believed in the idea of "static universe".

    I think it is Hubble's discovery which changed Einstein's mind about his idea of "static universe".
     
  20. Aqueous Id flat Earth skeptic Valued Senior Member

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  21. hansda Valued Senior Member

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    Einstein himself admitted his mistake and regretted about it.
     
  22. Tach Banned Banned

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    You finally admitted your crackpot agenda. Thank you.
     
  23. arfa brane call me arf Valued Senior Member

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    Hmm. Well, perhaps the "discussion" between Tach and hansda has reached the conclusion that Einstein didn't make any mistakes in his original paper, except for assuming the universe was static and unchanging.
    I don't actually care if either of them think there is a conclusion, or if in fact Einstein made a mistake, or even claimed he had.

    But then, Tach no doubt doesn't care what I think. He cares about what he thinks I think.
     

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