Negative pressure in quantum mechanics

[relativityfan]

hi,

which phenomena is known in quantum mechanics to cause a negative pressure?

as far as I know, the vacuum energy of the time energy uncertainty has a very low energy density but it should have a positive pressure because it pushes and not pulls, am i right? so which phenomena actually demonstrates a real negative pressure in quantum mechanics?

thank you for your reply!

 

[sweet springs]

Hi.

How about Cashimir effect? Net negative forces work on a pair of parallel plates.

Regards.

 

[haael]

as far as I know, the vacuum energy of the time energy uncertainty has a very low energy density but it should have a positive pressure because it pushes and not pulls, am i right? so which phenomena actually demonstrates a real negative pressure in quantum mechanics?

As sweet springs said above: the Casimir effect. When you have some area of space, then you have a pushing force outside it and a pushing force inside, but the former is bigger. So you have a force that tries to smash any area of space.