Flat directions in de Sitter space

Hiroshi Suzuki, Masahiro Tanaka

研究成果: ジャーナルへの寄稿学術誌査読

7 被引用数 (Scopus)


The one loop level effective potential along the flat direction in global supersymmetric models is evaluated in de Sitter space. In flat space the direction φ only has a curvature determined by the supersymmetry soft breaking mass term m2φ2 and in the supersymmetric limit m→0 it receives no radiative corrections because of the nonrenormalization theorem. In this paper we show that in de Sitter space the one loop radiative correction induces a term ∼-3g2H2φ2 ln(φ2)/(16π2) on the flat direction, where g is a typical coupling constant and H is the Hubble parameter. If the (renormalized) curvature coupling is nearly zero, 0, and the soft breaking mass is sufficiently small as m2g2H2/π2, the correction may qualitatively modify the tree level potential and give an unbounded potential for the flat direction. We argue that this behavior is irrespective of the matter content and the details of the model if the flat direction couples to a scalar multiplet (as realistic supersymmetric models should do). The unbounded potential may give a large vacuum expectation value of φ in the inflationary expanding universe and be desirable for baryogenesis by the Affleck-Dine mechanism. Including the back reaction effect, the unbounded potential may also cause the adjustment mechanism for the cosmological constant problem.

ジャーナルPhysical Review D
出版ステータス出版済み - 1994

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(その他)


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