Vacuum energy and Energy conservation

[Ebi Rogha]

TL;DR Summary

I understand from Noether's theorem, energy is not conserved in big scale space-time (because space-time is not static in big scales).

Also, I have heard from physicists that vacuum energy fluctuation (creation and destruction of virtual particles) violates energy conservation. The reason, they justify, is based on uncertainty principle (energy-time form of uncertainty principle), energy can exist and disappear for a very short period of time.
Could somebody explain this in simple words please?

 

[Vanadium 50]

I have heard from physicists

This is not an acceptable referende. How are we to track that down and figure out where the misunderstanding is.

Casimir experiment energy conservation violate energy conservation

They do not.

 

[Ebi Rogha]

They do not.

Thanks Vanadium 50
How about vacuum fluctuation, does it violate energy conservation?

 

[PeterDonis]

I have heard from physicists

As has already been pointed out, this is not a valid reference. Without a valid reference we have no basis for a discussion.

For that reason, I am closing this thread. @Ebi Rogha, if you have a reference, please PM me and I will look at it, and if it looks OK, I will reopen the thread so you can post it.