We study event-by-event dynamical fluctuations of various particle ratios at different energies. We assume that particle production in final state is due to chemical equilibrium processes. We compare results from resonance gas model with available experimental data. At SPS energies, the model can very well reproduce the experimentally measured fluctuations. We make predictions for dynamical flu...

Cosmic rays have been observed up to energies 10 times larger than those of the best particle accelerators. Studies of astrophysical particles (hadrons, neutrinos and photons) at their highest observed energies have implications for fundamental physics as well as astrophysics. Thus, the cosmic high energy frontier is the nexus to new particle physics. This overview discusses recent advances bei...

We present a theory that accurately describes the counting of excited states of a noninteracting fermionic gas. At high excitation energies the results reproduce Bethe's theory. At low energies oscillatory corrections to the many-body density of states, related to shell effects, are obtained. The fluctuations depend nontrivially on energy and particle number. Universality and connections with P...

One of the challenges in relativistic heavy ion collisions is to measure and study the large number of particles produced in such reactions. Measurement of particle density and transverse energy density in rapidity is a convenient way to describe particle production in heavy ion collisions. The pseudorapidity density (dN/dη) and transverse energy pseudorapidity density (dET /dη) at mid-rapidity...