----- Original Message ----- From: "Stephen A. Lawrence" <[EMAIL PROTECTED]> To: <vortex-l@eskimo.com> Sent: Friday, February 16, 2007 3:37 AM Subject: Re: [Vo]: FW: Einstein's Twin Paradox
... >>> This is not a paradox, and the "paradoxical" nature of the problem >>> was in fact resolved something on the order of a century ago. The >>> traveling twin accelerates; the stay-at-home twin does not; thus, >>> the symmetry is broken. >> ... >> >> To be more precise the traveling twin is the only one who accelerates >> _wrt the initial common frame of reference_, that's what breaks the >> symmetry (otherwise one could argue that they both accelerate wrt >> each other) > > No you could not. Acceleration is absolute, not relative. ... Not in the general sense Stephen. _Geometrically_, both twins accelerate wrt each other, agreed? It's _acceleration wrt an inertial frame of reference_ which is absolute of course, hence my point. I wasn't contradicting you, just highlighting a point which may not be obvious to everyone. Michel
