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Kaon condensation in baryonic Fermi liquid at high density

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Title
Kaon condensation in baryonic Fermi liquid at high density
Author(s)
Won-Gi Paeng; Rho M.
Publication Date
2015-01
Journal
PHYSICAL REVIEW C, v.91, no.1, pp.015801 -
Publisher
AMER PHYSICAL SOC
Abstract
We formulate kaon condensation in dense baryonic matter with antikaons fluctuating from the Fermi-liquid fixed point. This entails that in theWilsonian renormalization group (RG) approach, the decimation is effectuated in the baryonic sector to the Fermi surface while in the meson sector to the origin. In writing the kaon-baryon (KN) coupling, we take a generalized hidden local symmetry Lagrangian for the meson sector endowed with a “mended symmetry” that has the unbroken symmetry limit at high density in which the Goldstone π, scalar s, and vectors ρ (and ω) and a1 become massless. The vector mesons ρ (and ω) and a1 can be identified as emergent (hidden) local gauge fields and the scalar s as the dilaton field of the spontaneously broken scale invariance at chiral restoration. In matter-free space, when the vector mesons and the scalar meson.whose masses are much greater than that of the pion.are integrated out, then the resultingKNcoupling Lagrangian consists of the leading chiral order [O(p1)] Weinberg-Tomozawa term and the next chiral order [O(p2)] KN term. In addressing kaon condensation in dense nuclear matter in chiral perturbation theory, one makes an expansion in the “small” Fermi momentum kF .We argue that in theWilsonian RG formalism with the Fermi-liquid fixed point, the expansion is on the contrary in 1/kF with the “large” Fermi momentum kF . The kaon-quasinucleon interaction resulting from integrating out the massive mesons consists of a “relevant” term from the scalar exchange (analog to the KN term) and an “irrelevant” term from the vector-meson exchange (analog to the Weinberg-Tomozawa term). It is found that the critical density predicted by the latter approach, controlled by the relevant term with the irrelevant term suppressed, is three times less than that predicted by chiral perturbation theory. This would make kaon condensation take place at a much lower density than previously estimated in chiral perturbation theory.
URI
http://pr.ibs.re.kr/handle/8788114/2936
DOI
10.1103/PhysRevC.91.015801
ISSN
0556-2813
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HiddenCommunity > Journal Papers
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