Abstract
We apply the idea of the Unruh effect to the description of particle production in relativistic heavy ion collisions. Because the full information about all particles is needed, we employ the spectra of hadrons generated by the UrQMD model for pp and Au+Au collisions at various energies. Particles are considered as generated straight at the Unruh horizon thus allowing estimation of the Unruh temperature of the source. The analysis is provided for different types of mesons and their charges.
Highlights
In high energy collisions system quickly forgets its initial conditions after the relaxation to the completely thermal state, which is well described by hydrodynamic models in later times
We developed the algorithm to extract Unruh temperature from the heavy ion collision da√ta
At given multiplicity and energy distributions, Unruh source with temperature T is equivalent to the corresponding collision experiment;
Summary
In high energy collisions system quickly forgets its initial conditions after the relaxation to the completely thermal state, which is well described by hydrodynamic models in later times. In order to make the models work, any other information about the constituents should be lost by the time of order of 1 fm/c right after the collision This is too small to be described within any kinetics available. The created particles are emitted in a completely thermal state from the horizon. Using the UrQMD [9, 10] calculations as a data source, we investigate the distributions for different types of mesons and their electrical charges, namely, π, η, K and all of them in order to calculate the temperature of the process. We suggest appearance of the Unruh effect because of the momentum exchange between the colliding particles, without the direct analysis of the scattering process. The source generates distributions of the quantities which are being measured and allow to estimate its temperature
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