I Methods for energy harvesting in expanding universe?

[Suekdccia]

TL;DR Summary

Methods for energy harvesting in expanding universe?

There has been much discussion about how could we (theoretically) extract energy from the accelerated expansion of the universe.

However, the only gedankenexperiment I can found is the "tethered galaxies" one (e.g. https://arxiv.org/abs/astro-ph/0104349).

However, has somebody proposed an alternative mechanism or can someone come up with an alternarive scenario where we could make useful work from the accelersted universe expansion without using exceedingly speculative elements (like exotic matter)?

 

[Vanadium 50]

There has been much discussion

Where? By whom?

the only gedankenexperiment I can found is

Than how can you say there is a lot of discussion?

Many of your threads have bad starts, but you are opening with a contradiction here.

 

[berkeman]

Didn't we just have a thread about this recently here on PF?

 

[PeterDonis]

Didn't we just have a thread about this recently here on PF?

Yes, this one, by the OP:

https://www.physicsforums.com/threa...g-volume-increasing-as-space-expands.1046946/

 

[berkeman]

Yes, this one, by the OP:

https://www.physicsforums.com/threa...g-volume-increasing-as-space-expands.1046946/

So start the Jaws theme music...?

 

[PeterDonis]

Has somebody proposed an alternative mechanism or can someone come up with an alternarive scenario where we could make useful work from the accelersted universe expansion without using exceedingly speculative elements (like exotic matter)?

You are misdescribing the scenario that was discussed in your previous thread (linked to in post #4). The "exotic matter" involved is just dark energy, i.e., the thing that is causing the accelerated expansion. The speculative model in the paper cited in your previous thread was, as discussed in that thread, just an alternative way of modeling dark energy (and, as I pointed out in that thread, I don't really see the point of the alternative way of doing it, just doing the analysis in standard de Sitter spacetime would be simpler).

Further discussion can be done in the previous thread; there is no point in having two open threads on the same topic.

Thread closed.