Ultra-high energy cosmic rays, cosmological constant, and $θ$-vacua

Details Ultra-high energy cosmic rays, cosmological constant, and $θ$-vacua Ultra-high energy cosmic rays, cosmological constant, and $θ$-vacua

2003-01-13

arxiv.org/abs/hep-ph/0301086v2

Phys.Rev.Lett. 90 (2003) 191301

Physics

High Energy Physics

High Energy Physics - Phenomenology

ReVTeX, 4 pages, reference added. This version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.191301

We propose that the origin of ultra-high energy cosmic rays beyond the GZK cutoff and the origin of small cosmological constant can both be explained by vacuum tunneling effects in a theory with degenerate vacua and fermionic doublets. By considering the possibility of tunneling from a particular winding number state, accompanied by violation of some global quantum number of fermions, the small value of the vacuum dark energy and the production of high energy cosmic rays are shown to be related. We predict that the energy of such cosmic rays should be at least $5\times 10^{14}$ GeV.

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