4.8 Article

Can induced Θ vacua be created in heavy-ion collisions?

Journal

PHYSICAL REVIEW LETTERS
Volume 84, Issue 21, Pages 4814-4817

Publisher

AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4814

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We discuss a phenomenon important to the development of the early Universe which may be experimentally testable in heavy-ion collisions. An arbitrary induced theta vacuum state should be created in heavy-ion collisions, similar to the creation of the disoriented chiral condensate. It should be a large domain with a wrong theta(ind) not equal 0 orientation which will mimic the physics of the early Universe when it is believed that the fundamental parameter theta(fund) not equal 0. We test this idea numerically in a simple model where we study the evolution of the phases of the chiral condensates in QCD with two quark flavors with nonzero theta(ind) parameter. We see the formation of a nonzero theta(ind) vacuum on a time scale of 10(-23) s.

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