What difference do you make between a Bose Einstein condensate and a superfluid?

In article , the softrat wrote: In my day, many, many years ago, it was Halliday & Resnick and Resnick &...

John Baez wrote in message ... In article , ...

Hi, Thank you for opening up your discussion like this on s.p.r. I hope that if I ask some naive questions here and there, I won't distract from the subject too...

Arnold Neumaier wrote in message ... Could someone please explain to me (or point me to some paper...

Oz wrote in message ... Mike Stay writes: But I hereby bestow a blessing on you:...

From a previous posting by P. Gralewicz under thread "Shape of spacetime vs. shape of universe" Upthink wrote: Also, although I must admit to being a GR novice, I...

Does anybody know exactly the full range of activities that the weak and strong interactions give us? For example, in terms of the weak force I believe it's been said...

I am reading some interesting articles regarding Euler's rotational equations of motion for a 4-D body. In particular, I have been reading about the integrability of the...

Hi, I wonder about the following. How does a lorentz transformation affect a spinor? I would like to know this in terms of spin structure, lorentz frame bundle, spinor...

"Jacques Fric" a écrit dans le message news: ... Poincaré is well known as a mathematician, but he is less...

Hello Phillip: This claim does not make sense to me: The present data seem to indicate that the size of the universe is infinite, or at least very large. The...

(Pentcho Valev) wrote in message ... "Jon Lester" wrote in message...

On Thu, 24 Jul 2003 21:31:45 +0000 (UTC), Student wrote: Hi, Suppose you have two quantum systems in interaction. One is labelled 1 and the...

caterpillar122001 wrote I'm very interested in consciousness and would like to know whether any physicists spend their time studying it (ref: quantum mechanics,...

My references to epsilon_0 and mu_0 reveal my MKS-centrism. However, in arbitrary units, we may write electrostatic and magnetostatic force laws analogous to Newton's...

Hi, The assumptions about simple kinetic theory of gases include:- 'Collisions of the molecules with the walls of the container are elastic' What experimental evidence is...

Has anyone studied the h- (or q-) calculus for the case where h is a function rather than a constant? I.e. the h-derivative becomes f(x + h(x)) - f(x) ------------------ ...

Oz wrote: I get the feeling (and some evidence) that there are quite a lot of lurkers on the 'bears' tangle of threads. Could I make two requests? 1) Post...

In the 18th and 19th centuries, Newton's mathematical description of motion using calculus and his model for the gravitational force were extended very successfully to the...