13 Oct
2012
13 Oct
'12
9:29 a.m.
On Sat, Oct 13, 2012 at 1:17 AM, James Cloos <cloos@jhcloos.com> wrote:
"WS" == Warren Smith <warren.wds@gmail.com> writes:
WS> It seems to me, though, that such tachyons could interact with WS> exactly-lightspeed=massless particles like photons & gravitons.
Since when do photons have mass (aka energy) == zero? :-/
E = mc^2 only holds for objects at rest. The more general statement is E^2 = (mc^2)^2 + (pc)^2 which allows for massless particles with momentum travelling at light speed. So the answer to your question is, "Since the Big Bang." -- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com