
#1
Jun3004, 08:12 AM

P: 1,443

The matter in our universe is controlled by gravity which is a long range force obeying the inverse square law. In the large, antimatter cannot be found by astrophysicists and cosmologists. So the assertation that the universe is dominated by matter only is a fact of all experimental verifications. But in the small, the existence of antiparticles were proved facts. The quantum world is dominated by three fundamental forces: EM force, strong force and weak force. Gravity force has no effect at all in the quantum world asides from the black hole singularity domain and relativistic mass where the concept of extremely large mass (matter) is concerned. But if it takes large neutral mass (matter) to make gravity effective, would it also takes large neutral antimatter to make antigravity effective to the point of being detectable? So if a Cavendish experiment is made entirely of antimatter, can the G be repulsive? Matter attracts but antimatter (in the large) repels.




#2
Jun3004, 08:19 AM

Sci Advisor
PF Gold
P: 2,226

We can be fairly certain that the universe is dominated by matter, not antimatter, as though on the whole a large collection of antimatter looks almost exactly the same as a large lot of matter, if regions of matter and antimatter meet they anihilate each other emitting a copious amount of radiation. It is this radiation we would see if there was any large amoun tof antimatter in our universe.
The graviational force between mattermatter, antimattermatter, antimatterantimatter is always attractrive. 



#3
Jun3004, 08:30 AM

P: 1,443





#4
Jun3004, 08:33 AM

Sci Advisor
PF Gold
P: 2,226

Antimatter and Antigravity Connected ??? 



#5
Jun3004, 08:40 AM

P: 1,443





#6
Jun3004, 08:49 AM

Sci Advisor
PF Gold
P: 2,226





#7
Jun3004, 09:01 AM

P: 1,443

edits: add experiments Two related experiments: J. J. Thomson determination of the masstocharge ratio of the electron and Millikan's oil drop experiment. Both of these used the concept of the electric field and magnetic field to find the constants of masscharge ratio and the unit of charge. Along with the electric and the magnetic force, the other implied bystander force of these experiments is the inertial force of Newton's 2nd law of motion. Newton's 2nd law of motion, [itex] F=ma [/itex], mentioned an acceleration. This might not be the absolute acceleration that physicists are looking for. Newton, Mach and Einstein were all looking for this absolute acceleration. I think a complete understanding of this specific acceleration and its relation to a generalized absolute acceleration can find the lost force of antigravity. 



#8
Jun3004, 10:24 AM

P: 1,443

I think somehow this generalized absolute acceleration is related to a metric (a unit of length) with the following invariance between them.
[tex] \vec{a} \cdot \vec{r} = c^2 [/tex] where [itex] a [/itex] is the generalized acceleration, [itex] r [/itex] is the metric, and [itex] c[/itex] is the speed of light in vacuum. Edits: So that gravity is an acceleration that spiral inward and antigravity is an acceleration that spiral outward. And that when these are in balance, the component of centripetal is equal to the component of centrifugal. 



#9
Jun3004, 12:47 PM

P: 608

Antimater produces a regualar gravitational field like normal matter. You're thinking of exotic matter which has negative mass and therefore produces antigravity.




#10
Jun3004, 03:56 PM

P: 1,443

I am not talking about the EM deflection of positron by Carl Anderson. I am talking about something like an antiearth which cannot form because antimatter are really repulsive in the bulk. 



#11
Jun3004, 04:08 PM

P: 1,443

I would like to clearup what I mean when I say antimatter. Antimatter is made of antiatoms: antiprotons, antineutrons, and positrons. In parts, the antiprotons and antineutrons are made of antiup quarks and antidown quarks. All I know is that these antiparticles don't live long enough to form antiatom hence antimatter cannot be formed by current experiments at low energy.




#12
Jun3004, 04:23 PM

Sci Advisor
PF Gold
P: 2,226

IIRC an antihelium atom has been formed by experiment, but your sill barking up the wrong tree as for example if an antiparticle had negative mass it would completely chnage anihilation as the two rest masses would cancel each other out.




#13
Jun3004, 04:32 PM

P: 1,443

I don't think there is such a thing as negative mass. The complete quantization of space does not allow it although there can be two kinds of mass: the kinetic and the potential. Both are positive from my calculations. 



#14
Jun3004, 04:34 PM

Sci Advisor
PF Gold
P: 2,226

Yes but surely as the graviational attraction is proportioonal to the masses of the two objects in order for there to be repulsion there must have masses of opposite signs. 



#15
Jun3004, 04:35 PM

Sci Advisor
PF Gold
P: 2,226




#16
Jun3004, 04:52 PM

P: 1,443

When an electron and a positron interact, the products are photons. This was what Martin Deutsch experiments on positroniums indicated.
But there are two type of products: (1) two photons and (2) three photons. The positronium that produces the three photons seems to have a longer lifetime than the positronium producing the two photons. If electron is formed by 7 [itex]H^{}[/itex] and 1 [itex]H^{+}[/itex] and the positron is formed by 7 [itex]H^{+}[/itex] and 1 [itex]H^{}[/itex] and the photon is formed by 4 [itex]H^{}[/itex] and 4 [itex]H^{+}[/itex] then this can account for the 1st interaction but the 2nd interaction can be accounted only if vacuum is taken into consideration. The vacuum is made of even and odd [itex]H^{}[/itex] and even and odd [itex]H^{+}[/itex]. 



#17
Jun3004, 04:57 PM

Sci Advisor
PF Gold
P: 2,226

AFAIK the only limit on the products of electronpositron anihilation are the various conservation laws, certainly photons are far from the only product that can be produced by electronpositron anihilation.
I know we mentioned antihydrogen earlier, but electrons and postirons are fundamehtal particle s certainly not made out of hydrogen ions. 



#18
Jun3004, 05:10 PM

P: 1,443




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