What can we really learn from positron flux 'anomalies'? (2009)
Katz, Boaz, Blum, Kfir, Waxman, Eli
We present a critical analysis of the observational constraints on, and of the theoretical modeling of, aspects of cosmic ray (CR) generation and propagation in the Galaxy, which are relevant for the...
Magnetic fields and cosmic rays in clusters of galaxies (2009)
Kushnir, Doron, Katz, Boaz, Waxman, Eli
We argue that the observed correlation between the radio luminosity and the X-ray luminosity in radio emitting galaxy clusters implies that the radio emission is due to secondary electrons that are...
Fast radiation mediated shocks and supernova shock breakouts (2009)
Katz, Boaz, Budnik, Ran, Waxman, Eli
We present a simple analytic model for the structure of non-relativistic and relativistic radiation mediated shocks. At shock velocities \beta_s\equiv v_s/c\gtrsim 0.1, the shock transition region is...
The energy production rate & the generation spectrum of UHECRs (2008)
Katz, Boaz, Budnik, Ran, Waxman, Eli
We derive simple analytic expressions for the flux and spectrum of ultra-high energy cosmic-rays (UHECRs) predicted in models where the CRs are protons produced by extra-Galactic sources. For a...
Magnetic field evolution in relativistic unmagnetized collisionless shocks (2008)
Keshet, Uri, Katz, Boaz, Spitkovsky, Anatoly, Waxman, Eli
We study relativistic unmagnetized collisionless shocks using unprecedentedly large particle-in-cell simulations of two-dimensional pair plasma. High energy particles accelerated by the shock are...
Butt, Yousaf, Porter, Troy, Katz, Boaz, Waxman, Eli
For more than fifty years, it has been believed that cosmic ray (CR) nuclei are accelerated to high energies in the rapidly expanding shockwaves created by powerful supernova explosions. Yet...
In which shell-type SNRs should we look for gamma-rays and neutrinos from p-p collisions? (2007)
We present a simple analytic model for the various contributions to the non-thermal emission from shell type SNRs, and show that this model's results reproduce well the results of previous detailed...
Self-Similar Collisionless Shocks (2006)
Katz, Boaz, Keshet, Uri, Waxman, Eli
Observations of gamma-ray burst afterglows suggest that the correlation length of magnetic field fluctuations downstream of relativistic non-magnetized collisionless shocks grows with distance from...
Non-Local Effects of Multi-Trace Deformations in the AdS/CFT Correspondence (2005)
Aharony, Ofer, Berkooz, Micha, Katz, Boaz
The AdS/CFT correspondence relates deformations of the CFT by "multi-trace operators" to "non-local string theories". The deformed theories seem to have non-local interactions in the compact...