Dijana Tolic (Zagreb):

Trapped surfaces in a hadronic fluid

Abstract:

A close analogy may be drawn between the evolution of a hadronic fluid and the spacetime expansion. Using the formalism of relativistic acoustic geometry we analyze the expanding chiral fluid in the regime of broken chiral symmetry. Our trapping horizon is equivalent to the trapping horizon in contracting FRW spacetime. The ingoing pions, i.e. future directed ingoing null geodesics, freely cross the apparent horizon whereas the outgoing cannot penetrate the apparent horizon. Our marginally trapped surface may be regarded as an 'outer' white hole. This is opposite to an expanding FRW universe where the inner marginally trapped surface acts as a black hole. In addition, we discuss the Hawking effect associated with the analog apparent horizon.

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