Gravitational collapse

Well, crackpot, this is what you are angling, to "prove that Einstein was wrong".
Turns out that he was right after all: $$\Lambda$$ was retracted by Einstein in 1922 and was resurrected just recently by Saul Perlmutter.

I am not saying "lamda" is wrong. I am saying Einstein's idea of "static universe" was wrong, which he later regretted.
 
Q1) Einstein developed GR. GR predicts universe is either expanding or contracting. WHY Einstein still thought that the universe is static(though it was his mistake)?

Listen, crank

The original version, as published by Einstein in 1916 contained no mistake. Get it?
 
'sigh'

Einstein Static Cosmology

Einstein's original cosmological model was a static, homogeneous model with spherical geometry. The gravitational effect of matter caused an acceleration in this model which Einstein did not want, since at the time the Universe was not known to be expanding. Thus Einstein introduced a cosmological constant into his equations for General Relativity. This term acts to counteract the gravitational pull of matter, and so it has been described as an anti-gravity effect.
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?
 
Have you understood my question? You are answering something, which i never asked.

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

hansda said:
Q1) Einstein developed GR. GR predicts universe is either expanding or contracting. WHY Einstein still thought that the universe is static(though it was his mistake)?


Q2) How Einstein realized his mistake that the universe is not static?

So, once again, crackpot, there is no mistake in Einstein's papers. Live with it.
 
'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?

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.
 
It's amazing how this stuff works out.
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.
 
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.

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.
 
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.

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.
 
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.

Lemaître was a brilliant physicist, but he too was initially dismissed by Einstein.
 
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.

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.
 
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.

Q1) Einstein developed GR. GR predicts universe is either expanding or contracting. WHY Einstein still thought that the universe is static(though it was his mistake)?


Q2) How Einstein realized his mistake that the universe is not static?

You are a liar and you keep on lying, you are asking about Einstein purported "mistakes". There are no mistakes, live with it.
 
@hansda, to answer your questions

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

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

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

I think it is Hubble's discovery which changed Einstein's mind about his idea of "static universe".
 
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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