dlzc wrote:
On May 10, 1:43 am, jesko wrote:
...
Photon is supposed to have no REST MASS cause
no one can imagine a PHOTON at rest.

No, we can now that we have been able to slow them to a snail's pace
in a Bose-Einstein condensate.

These Bose-Einstein condensates are fascinating things. In another
thread, I mentioned that it looks like these mixtures are going to be
the next step up beyond chemistry, for making complex particles once the
universe cools down to a few thousandths of a degree above absolute
zero. Can you do BE condensates out of dissimilar atoms? So far, I've
only seen them doing these things with bunch of atoms of the same type
(eg. hydrogen).

How exactly does the BE condensates slow down light? It takes millions
of years for a photon to come out of the core of the Sun, for example,
but that's because it gets emitted, absorbed, re-emitted, etc. Is this
how it works inside a BE condensate too?

Yousuf Khan