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Kim, Jihn E.,Kyae, Bumseok,Nam, Soonkeon Springer-Verlag 2017 European Physical Journal C Vol.77 No.12
<P>In string compactifications, frequently the anomalous U(1) gauge symmetry appears which belongs to E-8 x E ' 8 of the heterotic string. This anomalous U(1) gauge boson obtains mass at the compactification scale (approximate to 10(18) GeV) by absorbing one pseudoscalar (corresponding to the model-independent axion) from the second rank antisymmetric tensor field B-MN. Below the compactification scale a global symmetry U(1)(anom) results whose charge Q(anom) is the original gaugeU(1) charge. This is the most natural global symmetry, realizing the 'invisible' axion. This global symmetry U(1)(anom) is suitable for a flavor symmetry. In the simplest compactification model with the flipped SU(5) grand unification, all the low energy parameters are calculated in terms of the vacuum expectation values of the standard model singlets.</P>
Naturally realized two dark Z ’s near the electroweak scale
American Physical Society 2017 Physical Review D Vol.96 No.5
<P>Chiral representations are the key to obtaining light fermions from some ultraviolet completed theories. The well-known chiral example is one family set of 15 chiral fields in the standard model. We find a new chiral theory SU(2)(dark) xU(1)(Q) with 16 chiral fields, which does not have any gauge and gravitational anomalies. The group SU(2)(dark) xU(1)(Q) may belong to the dark sector, and we present a derivation of the spectrum from the E-8 x E-8' heterotic string. Necessarily, there appear two degrees at low energy: two dark-Z' s, or a dark-Z' plus a dark photon. Being chiral, there is a chance to probe this theory at TeVaccelerators. Since the model belongs to the dark sector, the way to probe it is through the kinetic mixing.</P>
Exit from inflation and a paradigm for vanishing cosmological constant in self-tuning models
Kim, Jihn E.,Lee, Hyun Min Elsevier 2004 Physics letters: B Vol.590 No.1
<P><B>Abstract</B></P><P>We propose a paradigm for the inflation and the vanishing cosmological constant in a unified way with the self-tuning solutions of the cosmological constant problem. Here, we consider a time-varying cosmological constant in self-tuning models of the cosmological constant. As a specific example, we demonstrate it with a 3-form field in 5D.</P>
Jihn E. Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Axions can compose dark matter in the universe. We review the essential properties of axion, some related theoretical issues and its astrophysical and cosmological searches. Axions can compose dark matter in the universe. We review the essential properties of axion, some related theoretical issues and its astrophysical and cosmological searches.