Lawrence Krauss: Observing a Baby Universe's Expansion

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Discussion Overview

The discussion centers around the concept of a "baby universe" as proposed by Lawrence Krauss, particularly focusing on the implications of quantum fluctuations and the observational characteristics of such a universe from an external perspective. The scope includes theoretical considerations and speculative reasoning regarding cosmology and black hole physics.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant references Krauss' lecture, questioning why a baby universe would appear to collapse into a black hole from an external viewpoint.
  • Another participant speculates that the appearance of collapse might relate to the warping of spacetime inside a black hole.
  • A third participant suggests reading "The Inflationary Universe" by Alan Guth for further insights on the topic.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the reasons behind the appearance of a baby universe resembling a collapsing black hole, indicating that multiple viewpoints and uncertainties remain in the discussion.

Contextual Notes

The discussion lacks detailed exploration of the underlying assumptions regarding quantum fluctuations and the nature of spacetime in relation to black holes.

Routaran
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Lawrence Krauss Lecuture: What a baby expanding universe may look like from "outside"

I watched a lecture by Krauss a while back


one of the questions that was asked near the end was that if it was possible that quantum fluctuations could produce a baby universe within our own and if we'd be able to observe this.

Part of Krauss' response was that from inside this baby universe would be exponentially expanding but from outside it will look like it was collapsing to form a black hole so we wouldn't be completely sure.

my question is, why would this baby universe appear like a collapsing black hole?
 
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Space news on Phys.org


bump!
 


Not sure. That's one I've never heard of before. Perhaps something to do with the way spacetime warps inside a black hole?
 


Read The Inflationary Universe by Alan Guth he discusses this issue
 

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