From Newsgroup: sci.physics.relativity

On 11/23/2024 12:01 PM, Ross Finlayson wrote:

On 11/23/2024 11:54 AM, Ross Finlayson wrote:

On 11/23/2024 06:56 AM, ProkaryoticCaspaseHomolog wrote:

On Wed, 20 Nov 2024 2:43:16 +0000, rhertz wrote:

I'm a believer in the phenomenon of refraction to explain starlight
deflection and "gravitational lensing". I'm totally against the crap
of GR and curved spacetime. This, for the record.

In discussing possible refraction effects affecting experimental
observations of gravitational deflection by the Sun, we need to
distinguish between VBLI observations made at radio wavelengths versus
observations made at optical wavelengths.

At radio wavelengths, refraction by the solar atmosphere is a known
issue. This refraction is dependent on frequency according to the
following formula: n = sqrt(1 - -e_p^2 / -e^2 ) where -e_p is the plasma >>> frequency, which is dependent on the electron density at the time of
observation.

VLBI observations of quasars like 3C279 are performed at multiple
wavelengths to allow highly accurate correction for this refraction,
which in any event is negligible beyond 3 degrees from the Sun.
https://iopscience.iop.org/article/10.1088/0004-637X/699/2/1395/pdf

Optical frequencies are unaffected by plasma refraction. Any bending
of light due to refraction would be from a different source.

At optical wavelengths, refraction is due to atoms or molecules
acting as polarizable dipoles. Incoming electromagnetic waves shift
their electrons back and forth. The dipoles absorb incoming light and
re-radiate light at the same frequency. Since the resonant frequency
of the dipoles does not match that of the incoming light, the
re-radiated light will be of slightly retarded phase relative to the
incoming light. The net result of all of this to slow the speed of
the wave passing through the medium. (This is assuming that the
frequency is not near an absorbance line, which results in anomalous
dispersion).

In the case of the Sun's atmosphere, above a transition zone a few
thousand kilometers above the surface, the coronal gases are heated
by as of yet poorly understood mechanisms to temperatures greater
than a million degrees. At these temperatures, all of the lighter
elements (hydrogen, helium, carbon, nitrogen, and oxygen) are
stripped of all their electrons, leaving bare nuclei. The few spectral
lines visible in the corona (above its bright continuous background)
are due to traces of iron, calcium, and other heavier elements which
manage to retain a few of their electrons.

The solar corona is therefore not only far too tenuous to account for
the observed deflection of starlight around the Sun, it is almost
totally devoid of polarizable species that can contribute to
refraction at optical wavelengths.

How about that it's the opposite of "camera obscura", the pinhole
camera, the "Large-Fresnel lensing" may have an optical explanation
why as about bodies that optical light focuses, makes imaging,
and that it happens to be the same as the geodesy, as about
_orbits_ here the point being instead of deflection.

Anyways that's a wonderful exposition and theories of stellar pulsation
after theories of stellar formation as with regards to "The Hearth"
and all, is pretty great.

Here there are two things considered with regards to the
imaging and precession about what crosses the solar coronal.
One is that Einstein's cosmological constant was given a
non-zero value, so that "the observed position of Mercury's
precession", which goes away, that the theory provided about
half of the correction. Then another is the Fresnel, has
some consideration that there's "Large Fresnel", about either
the other half or all the effect, and what makes otherwise
usual notions of Einstein crosses and all that in the sky survey,
vis-a-vis "micro-lensing", gravitational as it's deemed to be,
"micro-lensing", and "micro-lensing anomalies".

If there's one thing it helps to reflect, is that
"electromagnetic radiation", the electrical field,
and "optical radiation", in space, are _not_ the same thing.
Yes I know that it's common that optical radiation is in
the "electromagnetic spectrum", simply according to
frequency and wavelength, that's though kind of where it ends.


So, kind of a "super camera obscura: camera occulta",
has of course just a little brief own theory.

This "light makes orbits" can sort of explain "redshift bias" also
when galaxies make "Large rotational down-Doppler" and this kind
of thing - that such as these ad hoc theories are as minimal
as yet relate and connect right back to the rest of QM and GR, ....

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