I understand that ALPHA experiments revealed that hydrogen and anti-hydrogen atoms have the same spectrum. Is it possible that some galaxies are comprised of extremely similar configurations of matter, except the charges of the subatomic particles are reversed, for example where hydrogen is comprised of: Antiproton + neutron + neutrino? (basically anti-matter galaxies) How would current physics dictate the generated electromagnetic "sphere" of that galaxy react to ours if the sum of the charge was different or it was polarized a certain way and ours was polarized another? How do we have the understanding that all anti-matter destroyed all matter and is there any evidence that the galaxies just have various electromagnetic properties due to their compositions?
2 Answers
The first part
Is it possible that some galaxies are comprised of extremely similar configurations of matter, except the charges of the subatomic particles are reversed,
is answered in this question here.. If there existed antimatter galaxies we would have seen them from the annihilations at the interfaces.
The example makes no sense:
for example where hydrogen is comprised of: Antiproton + neutron + neutrino? (basically anti-matter galaxies)
Hydrogen is made up by a proton and an electron, antihydrogen by an antiproton and a positron ( the alpha experiment). Your proposal is unphysical 1) antiproton would annihilate with the neutron, 2) the neutrino interacts only weakly and cannot form bound states.
This makes no sense within astrophysics as we know it:
How would current physics dictate the generated electromagnetic "sphere" of that galaxy react to ours if the sum of the charge was different or it was polarized a certain way and ours was polarized another?
there is no electromagnetic sphere of a galaxy reacting with another galaxy . Sum of charges also has no physical meaning , and polarization at such distances and sizes also has no meaning.
The title also defies present knowledge of physics:
Is it possible there are exotic forms of matter comprised of neutrinos instead of electrons?
As I said neutrinos interact only with gravity and the weak interaction and cannot form bound states.
I will try to answer the question in the title. I tend to think that, theoretically, space objects made of neutrinos should be possible. On the one hand, neutrinos apparently have (very small) mass, so gravity should attract them to each other, on the other hand, neutrinos are fermions, so they should form a degenerate matter at sufficiently high density and sufficiently low energy. Therefore, under appropriate conditions, such objects should neither expand (against gravity) nor collapse (against the Pauli principle). So I don't quite understand @annav's statement: "The title ... defies present knowledge of physics". My reasoning above seems to contradict hers: "neutrinos interact only with gravity and the weak interaction and cannot form bound states"
See also https://arxiv.org/abs/1307.6788 (Abstract: Recent weak and strong lensing data of the galaxy cluster A1689 are modelled by dark fermions that are quantum degenerate within some core. The gas density, deduced from X-ray observations up to 1 Mpc and obeying a cored power law, is taken as input, while the galaxy mass density is modelled. An additional dark matter tail may arise from cold or warm dark matter, axions or non-degenerate neutrinos. The fit yields that the fermions are degenerate within a 430 kpc radius. The fermion mass is a few eV and the best case involves 3 active plus 3 sterile neutrinos of equal mass, for which we deduce 1.51±0.04 eV. The eV mass range will be tested in the KATRIN experiment.)
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