Subject: EPR-paradoxon. From: Reinhart Frosch <reinifrosch(at)BLUEWIN.CH> Date: Fri, 25 Mar 2005 09:26:58 +0000A question to List members interested in physics (sorry, I am on no physics List): A spinless particle (e.g., an uncharged pi-meson), at rest above Paris, decays into two photons. The first of these photons is detected at a place 100 km north of Paris and is found to spin to the right (event A). The second photon flies in the opposite direction and is detected at a place 100 km south of Paris (event B). In the rest system of Paris, events A and B are simultaneous. The observer A can predict with certainty that the photon at B is also found to spin to the right (since the two spins add up to the pi-meson spin, which is zero). On page 123 of his recent book "The Universe in a Nutshell", Stephen Hawking writes: "Einstein thought that this proved that quantum theory was ridiculous. [...] However, most scientists agree that it was Einstein who was confused, not quantum theory. The Einstein-Podolsky-Rosen thought experiment does not show that one is able to send information faster than light. One cannot CHOOSE that one's own particle be measured to be spinning to the right, [...]" In the new German best-selling biography "Einstein" by Jürgen Neffe, the EPR-paradoxon is however claimed to be a valuable contribution. The undersigned believes that Hawking wins. Is my opinion really shared by most scientists? Reinhart Frosch, CH-5200 Brugg. reinifrosch(at)bluewin.ch