Re: Redshift without expansion

Dear Joseph Lazio:

"Joseph Lazio" <jlazio@xxxxxxxxxxxxxxxxx> wrote in message
news:llslldhc5q.fsf@xxxxxxxxxxxxxxxxxxxx
"s" == sean <jaymoseley@xxxxxxxxxxx> writes:
....
s> And GR seems irrelevent here. Its the doppler
s> effect which is supposedly responsible for the
s> redshift. GR was formulated before redshift
s> was discovered wasnt it?

Sean, we've argued in the past, and you had no interest in my
input. I don't really expect that has changed. Gravitational
time dilation is observed locally. All that is required is that
light be generated in a place of higher curvature (gravity) and
detected in a place of lower curvature to get red shift. If the
Universe is expanding, then *global* curvature is relaxing, and
light emitted at an early age will be red shifted when observed
later. And it will have all the "symptoms" of motion, yet not be
powered by rockets (or Dark Energy) to create expansion.

Yes. This is usually taken as the mark of a
successful theory, to predict something before it
is observed.

Actually, to get the history straight,
- In 1842, Christian Doppler published an
explanation of the effect that now bears his name.
- In 1864, James Clerk Maxwell presented the
equations that now bear his name.
- In 1915, Albert Einstein published GR.
- In 1929, Hubble and Slipher showed that light from
spiral nebulae was redshifted.

Let's add the fact that Einstein believed in a static Universe
when GR was first formulated, and Lemaitre showed that GR also
contained the ability to describe expansion, also around 1929.

That also is the mark of a good theory, that it is sufficiently
clear that others can grasp its meaning, and make quantitative
predictions that its author never foresaw (or perhaps didn't
initially believe in).

David A. Smith


.

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