- #1
jaiii
- 23
- 0
How to change the curvature of space-time around a very powerful laser beam?
Manipulating Space-Time with Lasers
- Context: Graduate
- Thread starter jaiii
- Start date
-
- Tags
- Lasers Space-time
Click For Summary
Discussion Overview
The discussion revolves around the manipulation of space-time using powerful laser beams and rotating objects, exploring concepts from general relativity (GR) and the effects of rotation on space-time curvature.
Discussion Character
- Exploratory
- Technical explanation
- Conceptual clarification
- Debate/contested
Main Points Raised
- One participant inquires about changing the curvature of space-time around a powerful laser beam.
- Another suggests looking into pp-wave spacetimes, specifically axisymmetric pp-wave spacetimes.
- A different participant mentions the Bonnor beam as a relevant GR solution.
- There is a question regarding the effects of a rotating metal disk on space-time curvature, with a participant seeking clarification on the term "lame" as it relates to space-time.
- One participant explains that rotating objects drag space-time around with them, referencing frame-dragging.
- Another participant adds that rotating coordinates can also affect space-time curvature in the absence of a rotating mass.
Areas of Agreement / Disagreement
The discussion includes multiple competing views and interpretations regarding the manipulation of space-time, particularly concerning the effects of lasers and rotating objects. There is no consensus on the terminology or the specific effects discussed.
Contextual Notes
Some terms and concepts, such as "lame" in relation to space-time, are subject to translation issues and may not be universally understood. The discussion also touches on advanced concepts in general relativity that may require further clarification.
Who May Find This Useful
This discussion may be of interest to those studying general relativity, space-time manipulation, and the effects of rotation in physics.
- #2
Dale
Mentor
- 36,773
- 15,732
Look up pp-wave spacetimes, particularly the axisymmetric pp-wave spacetimes.
- #3
Mentz114
- 5,429
- 292
- #4
jaiii
- 23
- 0
Spinning disk
Thank you for your reply but I have another question
How lame space time around a rotating metal disk?
Thank you.
Thank you for your reply but I have another question
How lame space time around a rotating metal disk?
Thank you.
- #5
Dale
Mentor
- 36,773
- 15,732
Huh? What is a lame spacetime?
- #6
jaiii
- 23
- 0
"lame" I mean curvature of spacetime.
I am sorry but this text translate Google from Slovak languige.
- #7
tiny-tim
Science Advisor
Homework Helper
- 25,837
- 258
Hi jaiii ! 
Any rotating object "drags" spacetime around with it …
see http://en.wikipedia.org/wiki/Frame-dragging"
Any rotating object "drags" spacetime around with it …
see http://en.wikipedia.org/wiki/Frame-dragging"
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")
Last edited by a moderator:
- #8
Dale
Mentor
- 36,773
- 15,732
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
http://www.phys.uu.nl/igg/dieks/rotation.pdf
Last edited by a moderator:
Similar threads
Undergrad
Battery life on VERY fast moving object
- · Replies 128 ·
- · Replies 28 ·
- · Replies 90 ·
- · Replies 15 ·
Undergrad
How to communicate between planets?
- · Replies 26 ·
- · Replies 0 ·
- · Replies 11 ·
- · Replies 2 ·
- · Replies 1 ·
- · Replies 31 ·