Timeline for Center of mass of two $\gamma$ rays moving in opposite directions
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 8, 2018 at 2:11 | vote | accept | Thiago | ||
| Nov 20, 2014 at 17:03 | answer | added | Peter | timeline score: 2 | |
| Nov 20, 2014 at 16:06 | answer | added | user65081 | timeline score: 0 | |
| Nov 20, 2014 at 14:53 | comment | added | dmckee --- ex-moderator kitten | Think about the sign convention for the Doppler shift. The choice of + on top, - on bottom or vice versa depends on the relative motion of the source and observer. So. for boost along the line of the photons' flight one photon should get each convention---they don't change synchronously. | |
| Nov 20, 2014 at 14:43 | comment | added | dmckee --- ex-moderator kitten | The center of momentum frame is one with zero total momentum. In Newtonian physics that is synonymous with the center of mass frame, but the former term is preferred in relativistic physics. The center of mass itself is a place. Did you want the location or the frame? | |
| Nov 20, 2014 at 14:20 | answer | added | Drake Marquis | timeline score: -1 | |
| Nov 20, 2014 at 14:20 | comment | added | Thiago | @DrakeMarquis, the problem is still there. Because both terms cancel out. | |
| Nov 20, 2014 at 14:17 | comment | added | Drake Marquis | You should flip the base of your last expression when calculating the frequency of the other photon. | |
| Nov 20, 2014 at 14:12 | history | asked | Thiago | CC BY-SA 3.0 |