Gravity and radiation from charge

[sweet springs]

Reading a thread in relativity I would like to know more precisely about radiation from charge.

1
I put a charge on the table of my house. Gravity and table reaction force work on the charge.
They cancel so net force does not work on the charge, thus no-force no-velocity cause no radiation. Am I right ?
2
A charge is put on the Earth that rotates around the Sun. Does synchrotron radiation by rotation motion take place ? Does it takes place but in non measurable tiny amount ?
3
Say a charge is free falling attracted by gravity of an electrically neutral planet, radiation takes place from a charge due to acceleration motion. But in co-moving local frame of reference with the charge, nothing particular including radiation would take place. How do we conciliate these views?

 

[Dale]

How do we conciliate these views?

You simply recognize that radiation is frame dependent. What is invariant is not whether or not there is radiation, but whether or not a given detector detects a fluctuating voltage/current.

 

[sweet springs]

I have thought something running with speed c, radiated electromagnetic wave, is commonly recognized to all the frames. I will do practice with your teaching. Thanks.

 

[Dale]

I have thought something running with speed c, radiated electromagnetic wave, is commonly recognized to all the frames.

All inertial frames, yes. Not non inertial frames.

 

[atyy]

The equivalence principle is only valid as a "local" principle. It is invalid in "nonlocal" situations, and radiation is a "nonlocal" phenomenon.

See the discussion in:

https://www.amazon.com/dp/0198567324/?tag=pfamazon01-20 (Section 1.15)

https://arxiv.org/abs/0806.0464

 

[sweet springs]

Thanks for your teaching. I will read PDF to get it.