What will the universe *look* like in 15 billion years from now ?

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Discussion Overview

The discussion revolves around predictions and theories regarding the appearance and characteristics of the universe 15 billion years into the future. It touches on cosmological concepts, the fate of stars and galaxies, and the implications for cosmology as a field of study.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant references a paper by Lawrence Krauss that discusses the future of cosmology and the potential disappearance of evidence for the Hubble expansion, suggesting that future observers may not be able to determine the true nature of the universe.
  • The paper posits that the universe may return to a static state, leading to a fundamental shift in how cosmology is understood, particularly regarding the cosmic microwave background (CMB) and vacuum energy.

Areas of Agreement / Disagreement

The discussion does not present a consensus, as it primarily consists of a reference to a paper without further elaboration or debate among participants.

Contextual Notes

The discussion lacks detailed exploration of the assumptions made in the referenced paper and does not address potential limitations in the predictions about the universe's future.

Nikarasu M
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oops

thread here:

https://www.physicsforums.com/showthread.php?t=400913
 
Last edited:
Astronomy news on Phys.org
https://www.physicsforums.com/showthread.php?t=400913
 
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sorry mods - wrong forum ...

please delete
 
This is not the perfect paper but it can help.
http://arxiv.org/abs/0704.0221

It is about what it will be like to study cosmology at some time far in the future. What will happen to the stars and galaxies that we observe now, to learn about the universe? What will happen to the CMB, the cosmic microwave background, which now we can observe and learn things from?

This paper is by a famous cosmologist named Lawrence Krauss.
http://arxiv.org/abs/0704.0221
The Return of a Static Universe and the End of Cosmology

Lawrence M. Krauss (1,2), Robert J. Scherrer (2) ((1) Case Western Reserve University, (2) Vanderbilt University)
(Submitted on 2 Apr 2007 (v1), last revised 27 Jun 2007 (this version, v3))
We demonstrate that as we extrapolate the current LambdaCDM universe forward in time, all evidence of the Hubble expansion will disappear, so that observers in our "island universe" will be fundamentally incapable of determining the true nature of the universe, including the existence of the highly dominant vacuum energy, the existence of the CMB, and the primordial origin of light elements. With these pillars of the modern Big Bang gone, this epoch will mark the end of cosmology and the return of a static universe. In this sense, the coordinate system appropriate for future observers will perhaps fittingly resemble the static coordinate system in which the de Sitter universe was first presented.
Comments: 5th prize 2007 Gravity Research Foundation Essay Competition,
 

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