A Einstein & Light Deviation: Compute w/o Schwarzschild Metric

e2m2a
Messages
354
Reaction score
13
How did Einstein compute the amount of light deviation due to the Earth's gravitational field when the Schwarzschild metric was not known yet?
 
Physics news on Phys.org
He didn't get it right at the first try, in fact in his first calculations in 1908 he was off by a factor of 2. The correct result was obtained 1915 using the weak field approximation where all terms smaller than the order of 1/c³ were neglected, see http://home.fnal.gov/~syphers/Education/Notes/lightbend.pdf
 
Last edited:
Yukterez said:
He didn't get it right at the first try, in fact in his first calculations in 1908 he was off by a factor of 2. The correct result was obtained 1915 using the weak field approximation, see http://home.fnal.gov/~syphers/Education/Notes/lightbend.pdf
ok. Thanks for the reference.
 
e2m2a said:
How did Einstein compute the amount of light deviation due to the Earth's gravitational field when the Schwarzschild metric was not known yet?
http://mathpages.com/rr/s8-09/8-09.htm
 
  • Like
Likes m4r35n357

Thread 'I don't see how a black hole's event horizon can be crossed'

OK, so this has bugged me for a while about the equivalence principle and the black hole information paradox. If black holes "evaporate" via Hawking radiation, then they cannot exist forever. So, from my external perspective, watching the person fall in, they slow down, freeze, and redshift to "nothing," but never cross the event horizon. Does the equivalence principle say my perspective is valid? If it does, is it possible that that person really never crossed the event horizon? The...
View full post »

Thread 'Synchronizing clocks in an inertial frame if light is anisotropic'

ASSUMPTIONS 1. Two identical clocks A and B in the same inertial frame are stationary relative to each other a fixed distance L apart. Time passes at the same rate for both. 2. Both clocks are able to send/receive light signals and to write/read the send/receive times into signals. 3. The speed of light is anisotropic. METHOD 1. At time t[A1] and time t[B1], clock A sends a light signal to clock B. The clock B time is unknown to A. 2. Clock B receives the signal from A at time t[B2] and...
View full post »

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...
View full post »

Similar threads

I Adapting Schwarzschild Metric for Nonzero Λ
Replies
4
Views
2K
I Eddington-Finkelstein coordinates for Schwarzschild metric
Replies
9
Views
3K
I Transition of spherically symmetric gravitation
Replies
3
Views
1K
I Why Schwarzschild Metric for Deflection of Light & Precession of Perihelia?
Replies
4
Views
1K
I How to Measure Speed of Light & Is It Constant?
Replies
13
Views
3K
A Can You Have Rest w/o Energy? Schwarzschild vs. Rindler Metrics
Replies
18
Views
2K
I Maximize dτ w/ Schwarzschild Metric: Two Masses, m & M
Replies
7
Views
2K
B Solving Field Equations & Schwarszchild Metric
Replies
1
Views
1K
Is the Schwarzschild Metric Always Applicable to Black Holes?
Replies
1
Views
1K
Schwarzschild Light Anisotropy: Explained
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top