Were some of Einstein's thought experiments carried out later?

Thread starter lalbatros
Start date Mar 17, 2009
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Experiments

Mar 17, 2009

lalbatros

I would be interrested to learn about it.

Thanks

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Mar 17, 2009

atyy

Science Advisor

?

http://focus.aps.org/story/v16/st1

http://www.drchinese.com/David/EPR_Bell_Aspect.htm

Mar 19, 2009

Karl G.

In fact, highly precise atomic clocks were carried arounfd in planes, and time dilationof SR was confirmed. Gravitational photon redshift was also confirmed. That's all I can think of...

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I asked a question here, probably over 15 years ago on entanglement and I appreciated the thoughtful answers I received back then. The intervening years haven't made me any more knowledgeable in physics, so forgive my naïveté ! If a have a piece of paper in an area of high gravity, lets say near a black hole, and I draw a triangle on this paper and 'measure' the angles of the triangle, will they add to 180 degrees? How about if I'm looking at this paper outside of the (reasonable)...

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Thread 'Photon Energy Without Rest Mass – How?'

According to E = mc², energy seems to depend on rest mass. But photons have zero rest mass (m₀ = 0), and still carry energy, expressed as E = hf. How should this be understood? Does E = mc² only apply to particles with rest mass? Is there a more general form that includes massless particles like photons? Looking for clarity on how this works.

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Thread 'Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?'

From $$0 = \delta(g^{\alpha\mu}g_{\mu\nu}) = g^{\alpha\mu} \delta g_{\mu\nu} + g_{\mu\nu} \delta g^{\alpha\mu}$$ we have $$g^{\alpha\mu} \delta g_{\mu\nu} = -g_{\mu\nu} \delta g^{\alpha\mu} \,\, . $$ Multiply both sides by ##g_{\alpha\beta}## to get $$\delta g_{\beta\nu} = -g_{\alpha\beta} g_{\mu\nu} \delta g^{\alpha\mu} \qquad(*)$$ (This is Dirac's eq. (26.9) in "GTR".) On the other hand, the variation ##\delta g^{\alpha\mu} = \bar{g}^{\alpha\mu} - g^{\alpha\mu}## should be a tensor...

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Were some of Einstein's thought experiments carried out later?

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Thread 'Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?'

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