Extensive air showers with TeV-scale quantum gravity
  One of the possible consequences of the existence of extra degrees of freedom beyond the electroweak scale is the increase of neutrino-nucleon cross sections ($\sigma_{\nu N}$) beyond Standard Model predictions. At ultra-high energies this may allow the existence of neutrino-initiated extensive air showers. In this paper, we examine the most relevant observables of such showers. Our analysis indicates that the future Pierre Auger Observatory could be potentially powerful in probing models with large compact dimensions. 
Luis Anchordoqui, Haim Goldberg, Thomas McCauley, Thomas Paul, Stephen   Reucroft, and John Swain