On 3/17/2019 4:50 AM, agrayson2...@gmail.com wrote:
On Sunday, March 17, 2019 at 3:05:14 AM UTC-6, agrays...@gmail.com wrote:
On Sunday, March 17, 2019 at 2:49:43 AM UTC-6, Bruce wrote:
On Sun, Mar 17, 2019 at 7:38 PM <agrays...@gmail.com> wrote:
On Thursday, March 14, 2019 at 8:27:58 PM UTC-6,
agrays...@gmail.com wrote:
IIUC, the combined mass of an electron and proton is
larger than the hydrogen atom they form at
recombination time. Thus, I would expect a very narrow
pulse of energy as a result when recombination occurs.
This apparently being the case, why does the CMBR have
a black body distribution and not a pulse with a very
narrow spread? TIA, AG
Is this a really dumb question and the reason for zero
replies; or is it because no one here has the answer? Or
maybe just no interest in another puzzle? AG
Dumb question. CMB is thermal radiation, not the recombination
energy. It reflects the temperature at the time the universe
became transparent to radiation of all wavelengths -- because
the electron-proton plasma recombined to form less reactive
hydrogen.
Bruce
But the recombination energy must be part of the mix at
recombination time and this is never mentioned in the texts I have
read. I suppose this is another dumb question. AG
What this thread shows is that I don't understand the CMBR. Maybe no
one does. ISTM that the universe was cooling *prior* to recombination
time and therefore must have had a thermal spectrum *independent* of
the recombination. Yet the going assumption, AFAICT, is that the CMBR
*comes into existence* at recombination time, but is independent of
the physical recombination which is never included or mentioned as
part of the observed spectrum. Can anyone explain what is actually
going on in this model? TIA, AG
Your mistake is assuming that this recombination is one big jump from
complete dissociation to bound hydrogen atom. A hydrogen atom has lots
of energy states and, as the plasma cooled due to expansion, there would
be a continuous shift of energy from the proton/electron to the gamma rays.
Brent
--
You received this message because you are subscribed to the Google Groups
"Everything List" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to everything-list+unsubscr...@googlegroups.com.
To post to this group, send email to everything-list@googlegroups.com.
Visit this group at https://groups.google.com/group/everything-list.
For more options, visit https://groups.google.com/d/optout.
