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 Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...The Space and Astronomy Agora Re: Re: Does Free-falling Electron Radiate? Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response ToPosted by Alexander on January 26, 2001 00:30:04 UTC

OK, lets consider the following two cases:

1. Electron is inside a rocket which moves with acceleration a=9.8 m/sec^2. Does it radiate versus non-moving observer? According to e/dynamics, yes. Does it radiate versus observer in the rocket (which moves with the same acceleration as the electron)? By other words, if non-moving AM receiver outside rocket detects radiation, does the same receiver inside detects radiation too? If not, then where does the radiation outside comes from if there is no radiation inside the rocket? (Where do photons outside come from?) If yes, then let's go to the following situation.

2. Electron is inside the rocket which now stands still on the surface of Earth in the gravitational field of Earth g=9.8 m/s^2. Does the electron radiate for non-moving observer? If the answer on the last question from the previous example was yes (electron on accelerated rocket radiates for both observers), then according to indistinguishability between an acceleration and a gravitational field it should radiate in gravitational field too. So all electrons around us should radiate as they do in accelerated motion. But a)where is all this radiation? b)where does the energy of this radiation comes from? Electron is static in static gravitational field of Earth, so there are no sources of this energy as there are no any changes in the system. On the other hand, if the electron does NOT radiate in gravitational field but DOES in accelerated motion, then acceleration and gravity can be distinguished by such experiment. But this would contradict to GR, or would not it?

To make things even worse, consider free-falling electron next to free-falling AM receiver. As the electron moves with acceleration g vesus non-moving observer, it should radiate. But in the receiver's reference frame the situation is completely similar to absence of any gravitational field and any motion (free-falling frame is inertial frame of reference) - as if both electron and receiver were at rest and far from any gravitational field. So, electron should NOT radiate being at rest in inertial frame.

Is it possible that electron radiates for one observer and does not radiate for another?

Or may be I miss (or mess with) something more obvious?

Anyone to help?