Re: gravity

From: Bjoern Feuerbacher (feuerbac_at_thphys.uni-heidelberg.de)
Date: 09/12/04 

Date: Sun, 12 Sep 2004 17:18:35 +0200

Guck wrote:
> "Stou Sandalski" <stou.sandalski@gmail.com> wrote in message news:<chv6k4$iok@odbk17.prod.google.com>...
>
>>Bjoern Feuerbacher wrote:
>>
>>>Guck wrote:
>>>
>>>
>>
> OK it's as if black holes exist to show us how to separate light from
> gravity.

No. Try reading up on "Kerr metric" - that's for a charged black hole.

> But what about the neutrino? It's virtually massless, right?

Almost massless, but not total.

> http://pdg.lbl.gov/fireworks/intro_eng.swf
> They say that all known observable matter in the universe is made up
> of up quarks, down quarks,the electron and electron neutrino.
> These are the 4 fundamental particles.
>
> Then they tell us that there are 4 fundamental forces
> strong nuclear - gluons
> weak nuclear - bosons
> electromagnetic - photon
> gravity - gravitons

Err, gravitons, photons and gluons are *also* bosons. For the weak force,
the particles are W- and Z-bosons.

> OK so photons originate when an electron changes energy level
> orbitals-

Or when an electron and a positron annihilate.

BTW, if you leave out the word "orbital" above, the sentence makes more
sense.

> an electron jumping from an outer orbital to an inner one emits a
> photon.

That's one possibility. There are also processes like bremsstrahlung.

> So where does it actually come from?

 From the energy of the electron.

> I guess being in an inner orbital consumes less energy than
> an outer one,

No matter in which orbital the electron is, it *never* "consumes"
energy. It *has* less energy in an inner orbital.

> so the electron can sort of slow down in an inner
> orbital, it can relax a bit, so it emits the surplus energy as a
> photon.

Very vaguely right.

> OK anyway these photons cannot escape from black holes, but gravity
> can.

Virtual photons can escape from a black hole, just as virtual
gravitons can. Thus there is no essential difference.

> Is there a connection with so-called "massless" neutrinos?

No.

Bye,
Bjoern

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