Quantum reduced loop gravity: Semiclassical limit

被引:36
|
作者
Alesci, Emanuele [1 ]
Cianfrani, Francesco [2 ]
机构
[1] Uniwersytet Warszawski, Inst Fizyki Teoretycznej, PL-00681 Warsaw, Poland
[2] Univ Wroclaw, Inst Theoret Phys, PL-50204 Wroclaw, Poland
来源
PHYSICAL REVIEW D | 2014年 / 90卷 / 02期
关键词
COHERENT STATES GCS; HAMILTONIAN CONSTRAINT; GENERAL-RELATIVITY; MASTER CONSTRAINT; MATRIX-ELEMENTS; SPIN DYNAMICS; AQG; COSMOLOGY;
D O I
10.1103/PhysRevD.90.024006
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We discuss the semiclassical limit of quantum reduced loop gravity, a recently proposed model to address the quantum dynamics of the early Universe. We apply loop quantum gravity (LQG) techniques in order to define the semiclassical states in the kinematical Hilbert space and we demonstrate that the expectation value of the euclidean scalar constraint coincides with the classical expression, i.e., one of the local Bianchi I dynamics. The result holds as a leading order expansion in the scale factors of the Universe and opens the way to study the subleading corrections to the semiclassical dynamics. We outline how by retaining a suitable finite coordinate length for holonomies that our effective Hamiltonian at the leading order coincides with the one expected from loop quantum cosmology (LQC). This result is an important step in fixing the correspondence between LQG and LQC.
引用
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页数:22
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