On Tue, 16 Nov 2004 wrote:


alistair wrote:

[...]
shouldn't we
look at the possibility that some forms of energy do not curve
space-time?

So far, though, not one speck of evidence has been found to
suggest that ``some forms of energy do not curve space-time.''

Did you have some other kind of energy in mind?


I'm glad that researcher like you asked this kind of question. Whether
there is some form of energy that doesn't curve spacetime or not is not
very important to me. Of course, it is important because it is about the
concept of equivalence of mass and energy and the dynamics curving
spacetime and to what extent this concept holds.

I incline to ask question like whether a quantized composition field with
gravity significant enough in it will non-linearize other kind of forces.
For example, might it be possible that EM waves will be amplified in some
quantum gravity system?
Or the EM waves shares some sort of tidal wave effect? Right now, I don't
think we have observed or demonstrated any effect like I asked. The main
reason is we don't have a full-fledged quantum gravity theory, and
this makes researcher hard to formulate a scientific statement, then hard
to verify any statement.

In the past, I tried to ask this kind of question and I was toasted by
John Baez in some private emails. So I hope this time I have had asked
in a more acceptable way.

In order to make it short I stop asking here.



"I always wish everyday I woke up, I would ride a high tide of love
gliding through the Universe."------Charles Hui