403 research outputs found
Non-Gaussian fluctuations near the QCD critical point
We study the effect of the QCD critical point on non-Gaussian moments
(cumulants) of fluctuations of experimental observables in heavy-ion
collisions. We find that these moments are very sensitive to the proximity of
the critical point, as measured by the magnitude of the correlation length xi.
For example, the cubic central moment of multiplicity ~ xi^4.5 and the quartic
cumulant ~ xi^7. We estimate the magnitude of critical point contributions to
non-Gaussian fluctuations of pion and proton multiplicities.Comment: 4 pages, 3 figure
Proton number fluctuation as a signal of the QCD critical end-point
We argue that the event-by-event fluctuation of the proton number is a
meaningful and promising observable for the purpose of detecting the QCD
critical end-point in heavy-ion collision experiments. The long range
fluctuation of the order parameter induces a characteristic correlation between
protons which can be measured. The proton fluctuation also manifests itself as
anomalous enhancement of charge fluctuations near the end-point, which might be
already seen in existing data.Comment: 4 pages, version accepted in PR
Dynamic universality class of the QCD critical point
We show that the dynamic universality class of the QCD critical point is that
of model H and discuss the dynamic critical exponents. We show that the baryon
diffusion rate vanishes at the critical point. The dynamic critical index
is close to 3.Comment: 12 pages. To be published in PRD. Appendix about isospin density
added, introduction expande
Chiral Kinetic Theory
We derive the non-equilibrium kinetic equation describing the motion of
chiral massless particles in the regime where it can be considered classically.
We show that the Berry monopole which appears at the origin of the momentum
space due to level crossing is responsible for the chiral magnetic and vortical
effects.Comment: 4 page
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