Re: Time dilation and expanding space

On Feb 28, 12:06 am, "Robert Karl Stonjek" <ston...@xxxxxxxxxxxxxx>
wrote:
This one is a little obvious after some thought, but I haven't heard it mentioned before.

The frequency of light is like a clock in itself - if the frequency is lower then the clock at the source is slower as measured by an observer who also measures that redshift. If the redshifted electromagnetic radiation was a radio carrier wave then the frequency the observer must tune to is further down the dial, as expected, but the sounds transmitted via that carrier wave will also appear to be slowed down, like an audio tape running at the wrong speed.

This is true regardless of the cause of redshift - source moving away from observer, source near a gravitating body, or source at a very great distance (Hubble shift).

The Hubble redshift observed on Earth must also be accompanied by time dilation. If the frequency of light received is half, for instance, then the clock at the emitting end of that electromagnetic transmission is running at half the pace as the clock at the receiving end.

I assume that this time dilation is taken into consideration when observing pulsed transmission of the rotation of galaxies (pulses will be measured as slower than the actual rate, galaxies will appear to rotate slower then than actually do etc.)

Anyone know more on this?

--
Kind Regards
Robert Karl Stonjek

The term time-dilation is not even used in Einstein's 1923 lecture.
http://nobelprize.org/nobel_prizes/physics/laureates/1921/einstein-lecture.html

By then it has been mis-applied to anything that
resembles H.G Wells; from Doppler shift to
low watch batteries to the international date line.

The term nuclear-resonance is used by Pound-Snider
to describe a Mossbauer shift with altitude.

Retarded-time is the near-field effect used in
deriving time dependent Maxwell's equations.

Sagnac effect is the inertial coupling to a dielectric
that modifies the propagation velocity as in FOGs.

If the dielectric of free-space expands, and the
Hubble law suggest that it does, then a thinning
hydrogen gas should be a reasonable model... IMHO.

Propagation in a dielectric medium
http://farside.ph.utexas.edu/teaching/em/lectures/node98.html
http://en.wikipedia.org/wiki/Wave_impedance
http://en.wikipedia.org/wiki/Free_space
http://www-ssg.sr.unh.edu/ism/what.html

No doubt, cosmologists of every stripe will take me to
task over such a simple notion... but they can't
reach all four corners of their lab bench. ;o)

Sue...





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