On 11/4/17 3:01 PM, jacobnavia wrote:
If there is anew kind of attractive force, unknown to us, that pulls
matter together, we should be able to see some effects of this feeble
force in our environment.

Now, consider the earth moon system. We have a mirror there, that can
reflect any laser beam to the earth.

The orbit of the moon should be affected if the geometry works. When the
moon is moving away from the center of the galaxy it should feel a
braking effect. Wehn it is approaching, an accelerating effect.

Over time these effects could accumulate. Contrary to the noise, the
acceleration should always have a vector pointing to the Sagitarius
constellation.

We have extremely precise clocks, and we have even detected
gravitational waves. I do not think that detecting this force is very
difficult, if it can be done at all, of course.

And if it is not detected, it is surely an argument againt that supposition.

There many reasons that the experiment could fail. Braking effects of
the tides, and many others, influences of other planets, etc. Taking all
that into account is a considerable work.

How big is that force?

Those stars must be pulled somehow, by this attractive force, so that
their rotation doesn't go down as distance increases. This force holds
the galaxy together.

But as distance increases, the force decreases. Nuclear force is very
strong but doesn't reach very far. Gravity is much weaker but reaches
farther, much farther.

But gravity decreases as the square of distance, and doesn't reach as
far as this new force, even feebler than gravity.

But it is feasible for astronomers to catch it now, they have all the
required technology.

Nobody is looking however.

Looking for perturbations in the orbits of the planets that point to the
center of the galaxy.

Mond derived a relationship

M = v^4/(a0*G)

to explain the Tully Fischer relationship
Baryonic mass M ~ (galactic rotation v km/sec)^4
https://en.wikipedia.org/wiki/Modifi...onian_dynamics
with the physically dissatisfying modified gravity explanation for an
anomalous acceleration 'a0'.

But assume the observed velocity dispersion
represents a tangential velocity(v) around galactic center
that is related to a radial velocity(vr = constant*v)
that is a measure of mass inflow to the galactic center
whose galactic time(t) is measured by a/v.

This is dimensionally expressed as:

v^2 = G*M/R = G*M/(vr*t) = G*M/(vr*vr/a)
= G*M/(constant*v*constant*v/a)

then

M = constant^2*v^4/(a*G)

with the same dimensional form as MOND
but with a more physically satisfying explanation

The above formula dimensionally matched to the experimental data
baryonic mass M ~ (galactic rotation v km/sec)^4
for the baryonic Tully-Fisher relation
http://arxiv.org/abs/1512.04543 figure 2
with constant ~pi
indicates reasonable acceleration(a) values
on the order of 10^-9 cm/sec^2
and galactic times on the order of a billion years.

So 'a' can be interpreted as a deceleration
within galactic time-frame (t)
due to a drag like force (m*a)
on baryonic objects of mass m (dark matter?)
m*a ~ vacuum mass density * object crossection
optically unseen due to their
small size and diffuse distribution.

The implication is that these objects are much smaller than planets
but make up most of the galactic mass(M).