Physics – Plasma Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dpp.b1m01t&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 16-20, 1998 New Orleans, LA, abstract #B1M.01
Physics
Plasma Physics
Scientific paper
Highest energy particle acceleration in the universe must account for the recent observation of air showers at energies greater than 2 x 10E20 eV. Classical shock acceleration is so far limited by the maximum energy less than 10E19 eV. New models have emerged in the last decade to go beyond the propagation limit of 5 x 10E19 eV, considering the ultra-relativistic shock in fireballs at the source of Gamma Ray Bursts, coherent plasma oscillation at the black hole disk region, and top-down mechanism - decays of massive particles such as the Topological Defects. Highest energy events indicate some tantalizing mysteries of spatial and temporal correlation among themselves and possibly, with the Gamma Ray Bursts. Experimental efforts are getting prepared to observe these highest energy events (> 10E20 eV) from ground and satellites. Electro-static accelerators of terrestrial laboratories began to see different acceleration frontiers of high intensity laser wakefield. Wakefield acceleration indicates the highest acceleration rate per unit spatial displacement of particles, which may not be sustained in a large scale such as in the astrophysical settings. Two very different frontiers of particle acceleration indicate that perhaps we may be embarking on the extreme physical conditions that were hitherto unexplored and waiting for exploration. Challenging energy frontiers in cosmic ray physics and in laser wakefield experiments will be discussed.
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