Matter-ghost matter astrophysics. 7 :
Confinment of spheroidal galaxies by surounding ghost
matter.(p1)
Commentaire.
...Ce
travail fait l'objet de discussions passionnées avec le mathématicien
Jean-Marie Souriau, mon voisin et ami. Nous ne sommes pas parvenus à
un accord et chacun est resté campé sur ses positions.
Souriau :
- A partir de Newton,
tu retrouves Poisson. Mais à partir de Poisson, tu retrouves Newton.
- Certes, mais d'où
sors-tu l'équation de Poisson, de ton chapeau ?
- Eh bien je préfère
décider que l'univers obéit à l'équation de Poisson,
c'est tout.. C'est comme ça.
Matter-ghost
matter astrophysics. 7 :
Confinment
of spheroidal galaxies by surounding ghost matter.
Jean-Pierre Petit
& Pïerre Midy
Observatoire de
Marseille
France.
Abstract :
...This
is a new insight on the origin of Poisson equation. We show that for an
infinite constant density mass distribution this equations simply does not
exist, for no gravitational potential can be defined. Building Poisson equation
from general relativity requires steady state zeroth order metric solution
and steady state metric perturbation term. In an uniform and unlimited medium
these elements are missing. As a conclusion the ghost matter surrounding
a spheroidal galaxy confines it, although this a spherically symmetric system.
1) Introduction.
...In
a former paper we have considered the confinement of a galaxiy, due to its
environment of ghost matter. What happens if the galaxy is spheroidal ?
One would answer : this confinment cannot exist, for it contredicts the
Gauss theorem. Any matter which creates an newtonian field, if located outside
a sphere, gives a zero contribution in this region of space.
If, as the Lacedemonian
used to say....
...The starting point is that you admit a priori
than the gravitational field is nextonian at any distance, which should
be proved. Newtonian force varies like 1/r2 . Consider a medium,
with spherical symmetry, and successive layers, with same width Dr
. See figure 1.
Fig. 1 : The contribution
of successive
layers to the newton
force.
These two volumes corresponds
to masses :
(1)
M =
r s Dr
and
M' = r s'
Dr
The corresponding contributions
to the total newton force in O are :
(2)
...But s
�
r2 so that F �
F' . If one
wants to calculate the value of the gravitational field in a point of a
infinite constant matter density field, he must deal with the matter located
at infinite distance. Its contribution cannot be neglected.
...Consider
a basic problem. We have an infinite distribution of matter, over space,
and a single spheric hole. We want to calculate de the field inside. The
basic method consist to start from the field due to an infinite, constant
density distribution of matter. What does it look like ?
...Simple,
says the reader, let's apply the Poisson equation. One computes the flux
of the field through a closed surface :
Fig. 2 : The flux
through a closed surface due to a newtonian field.
then applies the Green theorem :
(3)
Writing :
(4)
we get the Poisson equation. We assume that this local law is valid everywhere
in space. Then, considering a constant density
r medium,
we build the solution :
(4bis)
D Y = 4 p Gr
= constant
In spherical symmetry
:
(5)
whose solution is :
(6)
...Conclusion
: if we take any arbitrary point in space, it is associated to a radial
field, which tends to infinite à infinite distance !
Fig.3 : The "classical"
gravitational field, in a constant density medium,
around any arbitrarly
given point M.
...Isin't strange ? Physically, any given Point
Pis equally attracted by all the points located in its vicinity. The resultant
of the force acting on that point should be zero. If based on that Poisson
equation, it is not. Why ?
