TL;DR
This paper examines the instabilities in two-flavor quark matter, focusing on the gradient instability in the g2SC phase related to the Goldstone $U(1)_A$ sector, highlighting potential issues in its stability.
Contribution
It identifies and discusses the gradient instability in the g2SC phase of two-flavor quark matter, emphasizing the role of the Goldstone $U(1)_A$ sector.
Findings
Gradient instability develops in the g2SC phase.
Instability is associated with the Goldstone $U(1)_A$ sector.
Highlights potential stability issues in two-flavor quark matter.
Abstract
I discuss briefly the instabilities of two flavor quark matter, paying attention to the gradient instability which develops in the g2SC phase in the Goldstone sector.
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