Today, a paper appeared on arxiv, "Wormhole geometries supported by quark matter at ultra-high densities" (paper 1403.0771) which appears to claim the Color-Flavor-Locked (CFL) quark matter could stabilize wormholes. I haven't waded through all of the math, but in general relativity stabilizing a wormhole requires negative energy density, and they seem to achieve this by having a negative "MIT bag" parameter : "one verifies that the Bag parameter is necessarily negative, in order to have consistent isotropic pressure solutions"

Are there QCD experts here who can comment on this? Is stabilizing a wormhole really as simple as just having a negative bag parameter? What does that really mean? Or is this just pushing the "unobtanium" off into another level (an unobtainable bag constant rather than an unobtainable energy density)?

This is especially interesting to me as I am making a case for the existence of CFL quark matter in the solar system (the initial papers are here on RG).

http://arxiv.org/pdf/1403.0771.pdf

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