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arXiv 1306.0482gr-qcastro-ph.COhep-thmath-phmath.MPquant-ph
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将引力转化为迹动力学:诱导引力action

Incorporating gravity into trace dynamics: the induced gravitational action

Stephen L. Adler

摘要:

研究了经典矩阵值场的迹动力学框架中引力的引入,由此提出了量子场论是涌现热力学,态矢约化是由对该热力学的涨落修正引起的.我们表明,度量必须纳入作为一个经典的,而不是一个矩阵值,字段,与源重力的正是协变守恒的痕迹应力能量张量的物质领域。然后,我们研究纠正经典引力作用引起的动态矩阵值的物质场,通过检查平均超过跟踪动态规范系综的物质场的行动,在存在一个一般的背景度量。利用全球Weyl标度和三空间一般坐标变换的约束,我们表明,零阶导数的度规,诱导引力作用的轨迹动力学正则系综的首选的休息框架必须有形式$$ ΔS=\int d^4x (^{(4)}g)^{1/2}(g_{00})^{-2} A\big(g_{0i} g_{0j} g^{ij}/g_{00}, D^ig_{ij}D^j/g_{00}, g_{0i}D^i/g_{00}\big), $$与$D^i$定义通过由$^{(4)}g/{^{(3)}g}=g_{00}+g_{0i}D^i$的$^{(4)}g$的余因子展开,和与$A(x,y,z)$的三个参数的一般功能。这个作用量具有“变色龙”性质:对于罗伯逊-沃克宇宙学度规,它{ \it精确地}简化为一个宇宙学常数,但对于史瓦西度规,它在史瓦西半径附近发散为$(1-2M/r)^{-2}$,表明它将对视界结构产生实质性的影响。

英文摘要:

We study the incorporation of gravity into the trace dynamics framework for classical matrix-valued fields, from which we have proposed that quantum field theory is the emergent thermodynamics, with state vector reduction arising from fluctuation corrections to this thermodynamics. We show that the metric must be incorporated as a classical, not a matrix-valued, field, with the source for gravity the exactly covariantly conserved trace stress-energy tensor of the matter fields. We then study corrections to the classical gravitational action induced by the dynamics of the matrix-valued matter fields, by examining the average over the trace dynamics canonical ensemble of the matter field action, in the presence of a general background metric. Using constraints from global Weyl scaling and three-space general coordinate transformations, we show that to zeroth order in derivatives of the metric, the induced gravitational action in the preferred rest frame of the trace dynamics canonical ensemble must have the form $$ ΔS=\int d^4x (^{(4)}g)^{1/2}(g_{00})^{-2} A\big(g_{0i} g_{0j} g^{ij}/g_{00}, D^ig_{ij}D^j/g_{00}, g_{0i}D^i/g_{00}\big), $$ with $D^i$ defined through the co-factor expansion of $^{(4)}g$ by $^{(4)}g/{^{(3)}g}=g_{00}+g_{0i}D^i$, and with $A(x,y,z)$ a general function of its three arguments. This action has "chameleon-like" properties: For the Robertson-Walker cosmological metric, it {\it exactly} reduces to a cosmological constant, but for the Schwarzschild metric it diverges as $(1-2M/r)^{-2}$ near the Schwarzschild radius, indicating that it will substantially affect the horizon structure.

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