Giorgio Torrieri, Sascha Vogel
We calculate the Bremsstrahlung photon spectrum emitted from dynamically evolving quarkyonic matter, and compare this spectrum with that of a high chemical potential quark-gluon plasma. We find that while the rapidity distributions are similar, the transverse momentum distribution and the harmonic coefficient is markedly different in the two cases. The transverse momentum distribution can be fit with an exponential, but is markedly steeper than the distribution expected for the quark-gluon plasma, even at the lower temperatures expected in the critical point region. The $v_2$ coefficient fluctuates chaotically from event to event, and even within the same event at different transverse momenta. The latter effect, which can be explained by the shape of quark wave functions within quarkyonic matter, might be considered as a quarkyonic matter signature.
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http://arxiv.org/abs/1302.1119
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