Laser and GR

[jaiii]

How to change the curvature of space-time around a very powerful laser beam?

 

[Dale]

Look up pp-wave spacetimes, particularly the axisymmetric pp-wave spacetimes.

 

[Mentz114]

There is a GR solution called the Bonnor beam.

http://en.wikipedia.org/wiki/Bonnor_beam

 

[jaiii]

Spinning disk

Thank you for your reply but I have another question
How lame space time around a rotating metal disk?

Thank you.

 

[Dale]

Huh? What is a lame spacetime?

 

[jaiii]

"lame" I mean curvature of spacetime.

I am sorry but this text translate Google from Slovak languige.

 

[tiny-tim]

Hi jaiii !

Any rotating object "drags" spacetime around with it …

see http://en.wikipedia.org/wiki/Frame-dragging" [Broken]

btw, "lame" means unable to walk properly ("he is lame", "he has a lame leg" "lame-duck president"), and also is used figuratively to mean something that doesn't work properly ("a lame excuse") ​

 

[Dale]

In addition to the information about how a rotating mass affects the curvature of spacetime you may want to read about how using rotating coordinates affects things in the absence of a rotating mass:

http://www.phys.uu.nl/igg/dieks/rotation.pdf [Broken]