We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


97% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Ultra-high energy cosmic rays, cosmological con...
View graph of relations

« Back

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

Research output: Contribution to journalJournal article


Article number191301
<mark>Journal publication date</mark>13/01/2003
<mark>Journal</mark>Physical Review Letters
Number of pages4
<mark>Original language</mark>English


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.

Bibliographic note

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