Black Holes & Time Travel: Wild Speculation

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Discussion Overview

The discussion revolves around the speculative idea of using micro black holes to bend space and time for the purpose of sending messages back in time. Participants explore the implications of black holes on time travel, particularly in the context of general relativity and quantum entanglement.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants propose that micro black holes could bend space and time similarly to larger black holes.
  • One participant asserts that the idea of using a micro black hole and a radio transmitter to send messages back in time is not feasible, referencing general relativity's stance on closed lightlike curves.
  • Another participant challenges the notion that time travel into the past could be achieved with either micro or large black holes, stating that while time travel into the future is possible, past communication remains unfeasible.
  • There is a suggestion that quantum entanglement could allow for future communication with the past, although this remains speculative.

Areas of Agreement / Disagreement

Participants express disagreement regarding the feasibility of time travel into the past using black holes, with some asserting it is impossible while others explore speculative ideas. The discussion remains unresolved on the potential of quantum entanglement for communication across time.

Contextual Notes

Limitations include the speculative nature of the discussion, dependence on interpretations of general relativity, and the unresolved status of time travel theories.

John d Marano
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This is wild speculation but wild speculation is fun;

Do micro black holes bend space and time like their bigger siblings? Could you then use the curvature of time of such a micro black hole and a radio transmitter to send a message back through time? Regards,
JDM
 
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John d Marano said:
This is wild speculation but wild speculation is fun;
Wild speculation is not allowed here on PF, but luckily your question is actually not very speculative and is well within mainstream General Relativity.

John d Marano said:
Do micro black holes bend space and time like their bigger siblings?
Yes.

John d Marano said:
Could you then use the curvature of time of such a micro black hole and a radio transmitter to send a message back through time?
In GR-lingo this question is "Does the Schwarzschild spacetime have closed lightlike curves?" and the answer to that is "No."
 
John d Marano said:
Could you then use the curvature of time of such a micro black hole and a radio transmitter to send a message back through time?

This question seems to imply that you think you could do this with a large black hole. You can't.
 
PeterDonis said:
This question seems to imply that you think you could do this with a large black hole. You can't.
It's well established that a black hole could be used to travel into the future; so could one quantum entangled particle be sent into the future with the purpose of communicating with the past by using the entanglement?

Wow; wild speculation is not allowed on PF. Wild speculation is the spice of life!

Regards,
JDM
 
Time travel into the past is not possible as far as science currently knows. Since PF exists to teach people about current, mainstream science, not to speculate on what might and might not be, I am closing this thread.
 
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