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arXiv 1512.03499hep-th
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超标度违反几何中的标量边界条件

Scalar Boundary Conditions in Hyperscaling Violating Geometry

Jian-Pin Wu, Xiao-Mei Kuang

摘要:

研究了具有Lifshitz动力学指数$z (z\geqslant1)$和超标度破坏指数$θ(θ\neq0)$的超标度破坏几何中标量场模的可能边界条件.对于$θ>0$的情形,我们证明了在参数为$1\leq z\leq 2,~-z+d-1<θ\leq (d-1)(z-1)$或$z>2,~-z+d-1<θ\leq d-1$的范围内,边界条件有不同的类型,包括Neumann,Dirichlet和Robin条件,而在参数为$θ\leq-z+d-1$的范围内,只能设置Dirichlet型条件.特别是,我们进一步证实,标量场的质量不发挥任何作用,在确定可能的边界条件$θ>0$,这已解决在参考\cite{1201.1905}。同时,我们也对$θ<0$进行了平行研究。我们发现,对于$m^2<0$,三种类型的边界条件是可用的,但对于$m^2>0$,只有一种类型是可用的。

英文摘要:

We study the possible boundary conditions of scalar field modes in a hyperscaling violation(HV) geometry with Lifshitz dynamical exponent $z (z\geqslant1)$ and hyperscaling violation exponent $θ(θ\neq0)$. For the case with $θ>0$, we show that in the parameter range with $1\leq z\leq 2,~-z+d-1<θ\leq (d-1)(z-1)$ or $z>2,~-z+d-1<θ\leq d-1$, the boundary conditions have different types, including the Neumann, Dirichlet and Robin conditions, while in the range with $θ\leq-z+d-1$, only Dirichlet type condition can be set. In particular, we further confirm that the mass of the scalar field does not play any role in determining the possible boundary conditions for $θ>0$, which has been addressed in Ref. \cite{1201.1905}. Meanwhile, we also do the parallel investigation in the case with $θ<0$. We find that for $m^2<0$, three types of boundary conditions are available, but for $m^2>0$, only one type is available.

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