Ref: http://scienceworld.wolfram.com/physics/Gravity.html
Ref: Hartle, "Gravity: An Introduction to Einstein's General Relativity", Addison
Wesley (2003)
"A few properties of the gravitational interaction that help explain when
gravity is important can already be seen from the gravitational force law
F_grav = G m_1 m_2 / r_12^2
o Gravity is a universal interaction in Newtonian theory between all mass, and,
since E = mc^2, in relativistic gravity between all forms of energy.
o Gravity is unscreened. There are no negative gravitational charges to cancel
positive ones, and therefore it is not possible to shield (screen) the gravitational
interaction. Gravity is always attractive.
o Gravity is a long-range interaction. The Newtonian force law ia a 1/r^2
interaction. There is no length scale that sets a range for gravitational
interactions as there is for the strong and weak interactions.
o Gravity is the weakest of the four fundamental interactions acting between
individual elementary particles at accessible energy scales. The ratio of
the gravitational attraction to the electromagnetic repulsion between two
protons separated by a distance r is
F_grav G m_p^2 / r^2 G m_p^2
-------- = -------------------- = ------------- ~ 10^-36
F_elec e^2 / (4 pi e_0 r^2) (e^2/4pi e_0)
where m_p is the mass of the proton and e is its charge.
These four facts explain a great deal about the role gravity plays in physical
phenomena. They explain, for example, why, although it is the weakest force,
gravity governs the organization of the universe on the largest distance
scales of astrophysics and cosmology. These distance scales are far beyond
the subatomic ranges of the strong and the weak interactions. Electromagnetic
interactions COULD be long range were there any large-scale objects with net
electric charge. But the universe is electrically neutral, and electromagnetic
forces are so much stronger than gravitational forces that any large-scale net
charge is quickly neutralized. Gravity is left to govern the structure of the
universe on the largest scales.
Herb--three unrelated ideas in your posting
o electric discharge
o gravitational field
o hypothetical entities orders of magnitude smaller that
subatomic particles--permanently safe from testing at those
scales. That's not a theory, as it's not testable!
Different subject--You have indicated in other posts that
you had made contributions worthy of a Nobel--in what area
of physics? Thanks.
Let me rephrase, Herb--Did you ever have an original thought
that contributed to our understanding of science that warrents
a Nobel--in your opinion?
Why don't those cosmic strings collapse into a ball? Ah, they must be
spinning fast to overcome gravity.
Anyway, it is wrong to group the weak interaction with the others. It
is an /impure/ force consisting of electrocolor interactions. With the
strong force, they have massive quanta and limited ranges because they
are impure forces. By the way, in my earlier message I classed gravity
as a longer-range force than electricity because of the scale that the
universe still takes on past the lightspeed horizon.
-Aut
For what thoughts? Specifically? Told by whom?
Everything and nothing.
It's OK for you to feel bad Herb... I'm to be pitied!
Herb--how do you feel about the publications of working physicists?
2 atoms near each other move their center of gravity from thier
center of mass .
F is the distance from the center of mass to the center of gravity.
17 hits... mostly geneology, althought one had "Mars Rover that pissed?"
> Sam in 1946 I wrote G=EMC^2 on a brown paper bag .
It's got dimensionality problems.