Low energy effective theory on a regularized brane in 6D gauged chiral supergravity

Low energy effective theory on a regularized brane in 6D gauged chiral supergravity
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6D 规范手性超重力中正则膜的低能有效理论

DOI:
10.1088/1475-7516/2007/12/006
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发表时间:
2007
影响因子:
6.4
通讯作者:
Arroja F
Arroja F
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Arroja F

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本文导出了六维手征超引力中膜上的低能有效理论。圆锥形3-膜奇点通过引入余维为1的圆柱形4-膜来解决,其内部被规则时空覆盖。有效理论由Brans-Dicke(BD)理论描述,BD参数由ω BD = 1/2给出。BD场起源于与系统的标度对称性相关联的模。如果膜上的标量场势保持标度对称性,则标量场在爱因斯坦坐标系中具有指数势。我们表明,在四维有效理论中的模量驱动的时间相关的解决方案可以提升到六维的精确解在文献中找到。在有效理论的基础上,我们讨论了一种可能的方法来稳定的模量恢复标准宇宙学,并研究了宇宙学常数问题的含义。
We derive the low energy effective theory on a brane in six-dimensional chiral supergravity. The conical 3-brane singularities are resolved by introducing cylindrical 4-branes of co-dimension 1 whose interiors are capped by a regular spacetime. The effective theory is described by the Brans–Dicke (BD) theory with the BD parameter given by ω BD= 1/2. The BD field originates from a modulus which is associated with the scaling symmetry of the system. If the dilaton potentials on the branes preserve the scaling symmetry, the scalar field has an exponential potential in the Einstein frame. We show that the time dependent solutions driven by the modulus in the four-dimensional effective theory can be lifted up to the six-dimensional exact solutions found in the literature. On the basis of the effective theory, we discuss a possible way to stabilize the modulus to recover standard cosmology and also study the implication for the cosmological constant problem.
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