Sunday, June 19, 2005

The mystery of mono-chromatic galactic gamma rays

Lubos Motl commented about the finding of galactic gamma rays which have energies very nearly to the rest of mass of electron. There was already a couple of years ago an article Astronomers claim dark matter breakthrough in New Scientist about this same topic. See also C. Boehm, D. Hooper, J. Silk, M. Casse (2003), MeV Dark Matter: Has It Been Detected?, arXiv:astro-ph/0309686. The proposal has been that these rays originate in the decays of electrons and positrons which are nearly at rest. TGD suggests a different explanation.
1. Lepto-hadrons
My personal explanation for the gamma rays is based on the explanation of much older anomaly manifesting itself in heavy ion collisions at the collising energy just above the Coulomb wall (my earliest reference seems to be A. T. Goshaw et al(1979), Phys. Rev. Lett. 43, 1065). Evidence for a pion like pseudoscalar resonance decaying to electron positron pair very nearly at rest was found. The TGD based identification of the resoance is as a pion like bound state of color octed excitations of ordinary electrons possible in TGD since color is not a spin like quantum number at fundamental level but corresponds to CP2 partial waves. The decay of leptopion BE condensate induced by the presence of pseudoscalar "instanton density" E.B created in nuclear collisions would yield the strange decay signatures. Perhaps the basic reason for why the observed resonances have been put under the rug is that asymptotic freedom dogma excludes them: the decay widths of W and Z simply leave no room for new light particles if asmptotic freedom prevails. If this is not the case, it is possible to have entire hierarchy of physics described by QCD type theories and existing only in finite range of length and momentum transfer scales. This is indeed predicted by TGD if quantum classical correspondence is taken seriously: non-vacuum extremals (with respect to inertial but not gravitational four-momenta) necessarily carry long range classical color fields.
2. TGD counterparts of cosmic strings
In TGD cosmic strings dominate the very early cosmology with mass density behaving as 1/a2 (a is lightcone proper time) so that initial singularity disappears since the mass per comoving volume going to zero. These cosmic strings are of form X2×Y2, X2 minimal surface in M4 and Y2 complex sub-manifold of CP2. During cosmic expansion they gradually transform to magnetic flux tubes of increasing thickness.
3. Bose-Einstein condensates of long leptohadronic magnetic flux as a particular instance of dark matter
Leptohadronic (color) magnetic flux tubes with thickness about 1/me are good candidates for the carriers of leptopion BE condensates. The corresponding minimal magnetic field strength would be about eB=about me2 =about 1010 Tesla with cyclotron frequency about electron mass. Magnetic fields of magnitude about 109 Tesla have been assigned with supernovae. Also cyclotron transitions in a magnetic field with strentgh about 109 Tesla could give rise to photons with energies around MeV but now also the harmonics of the basic line would be observed. Leptohadrons would be only a particular case of dark matter whereas dark energy would correspond to the magnetic energy of magnetic flux tubes. A TGD based model for dark matter can be found here. Leptohadrons are discussed here, and leptopions as explanation of .511 MeV gammas are discussed here. Matti Pitkanen

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