It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Hajdukovic’s paper on a dark matter alternative is also an attempt to understand cosmological phenomena without assuming the existence of unknown forms of matter and energy, or of unknown mechanisms for inflation and matter-antimatter asymmetry. In the case of the fast rotational curves of galaxies, he explains that there are currently two schools of understanding the phenomenon. “The first school invokes the existence of dark matter, while the second school invokes modification of our law of gravity,” he said. “I suggest a third way, without introducing dark matter and without modification of the law of gravity.” His ideas (like those in the previous paper) rest on the key hypothesis that matter and antimatter are gravitationally repulsive, which is due to the fact that particles and antiparticles have gravitational charge of opposite sign. (Though like matter, antimatter is gravitationally attractive with itself.) Currently, it is not known whether matter and antimatter are gravitationally repulsive, although a few experiments (most notably, the AEGIS experiment at CERN) are testing related concepts. “Concerning gravity, mainstream physics assumes that there is only one gravitational charge (identified with the inertial mass) while I have assumed that, as in the case of electromagnetic interactions, there are two gravitational charges: positive gravitational charge for matter and negative gravitational charge for antimatter,” Hajdukovic explained.
Originally posted by Thought Provoker
If antimatter was truly the exact opposite of matter, there'd be no energy released by the annihilation; they'd both just quietly vanish, their energies canceling each other out with no flash or bang or even a whimper.
But it's certainly possible... if anyone can explain to me how a gravitational attraction can exist between two masses 2.5 million lightyears apart (like our galaxy and Andromeda). That can't be messenger-particle swapping; know what I mean?
Originally posted by DJW001
An intriguing idea. Most of the anti-matter observed in particle interactions is quickly annihilated because the electromagnetic force is much stronger than the gravitational force at those distances. Over cosmic distances, the gravitational repulsion would take precedence, potentially rendering dark energy unnecessary to explain the accelerating rate of inflation. Very intriguing!
Originally posted by Thought Provoker
reply to post by swan001
I think they'd have a very difficult time trying to prove that antimatter gravitationally repels matter. It would take a substantial amount of antimatter and being in absolute free-fall; even the micro-gravity of an earth orbit would skew the results, as would their electrostatic attraction/repulsion. But it could be tested with enough effort... and money...
we argue that this hypothesis might be tested within the Solar System. The key point is that quantum vacuum ("enriched" with the gravitational dipoles) induces a retrograde precession of the perihelion. It is obvious that this phenomenon might eventually be revealed by more accurate studies of orbits of planets and orbits of the artificial Earth satellites. However, we suggest that potentialy the best "laboratory" for the study of the gravitational properties of the quantum vacuum is the Dwarf Planet Eris and its satellite Dysnomia; the distance of nearly 100AU makes it the unique system in which the precession of the perihelion of Dysnomia (around Eris) is strongly dominated by the quantum vacuum.
Originally posted by ErosA433
It is quite interesting, though antimatter would perhaps not be a great candidate if it is the anti-matter that we are used to dealing with. This is mainly because of the consequences, we would have 938MeV and 511keV gammas making the night sky sort of glow.
Originally posted by ErosA433
It is quite interesting, though antimatter would perhaps not be a great candidate if it is the anti-matter that we are used to dealing with. This is mainly because of the consequences, we would have 938MeV and 511keV gammas making the night sky sort of glow. We don't see that to the best of my knowledge, and observational evidence from galaxies would suggest that galaxies and clusters are swimming in this 'Dark Matter' That cannot occur unless we want to turn the universe into energy rather than mass.
So it must be something else, perhaps a new particle or as suggested something with this inverted gravitational charge, though conventional antimatter wouldn't work... but does offer a way of testing the hypothesis. We would just need a method of testing it... which is a little tricky to say the least
Originally posted by ErosA433
Thanks for that post, it does raise some good points and indeed perhaps a misconception of my own. I cant say im totally convinced in the proposal but it is definitely an intriguing theory that should (if possible) be explored.
Boskovic is famous for his atomic theory and made many important contributions to astronomy. including the first geometric precedure for determining the equator of a rotating planet from three observations of a surface feature and computing the orbit of a planet from three observations of its position. In 1753 he also discovered the absence of atmosphere on the Moon.
He also proposed that attractive Gravitational fields could be explained as diminished interactive EM fields. In 1745 Boskovic published "De Viribus Vivis" in wihch he tried to find a middle way between Isaac Newton's gravitational theory and Gottfried Leibniz's metaphysical
theory of the monad-point. --ABRAHAM
Originally posted by shixta
reply to post by swan001
There's 5 eBooks ( Quantum Mechanics, ElectroDynamics, Chemistry, Cosmology, and Geometrics ). And you're right there is a plethora of knowledge for anyone interested. This is setting the stage to be a next Generation Physics Text book.
Unlike modern text books, these are completely Free.