Losing the trace to find dynamical Newton or Planck constants
Losing the trace to find dynamical Newton or Planck constants
复制标题
失去寻找动力学牛顿或普朗克常数的踪迹
DOI:
10.1088/1475-7516/2021/04/028
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发表时间:
2021
影响因子:
6.4
通讯作者:
Masahide Yamaguchi
中科院分区:
文献类型:
--
作者:
Pavel Jirousek;Keigo Shimada;Alexander Vikman;Masahide Yamaguchi
We show that promoting the trace part of the Einstein equations to a trivial identity results in the Newton constant being an integration constant. Thus, in this formulation the Newton constant is a global dynamical degree of freedom which is also a subject to quantization and quantum fluctuations. This is similar to what happens to the cosmological constant in the unimodular gravity where the trace part of the Einstein equations is lost in a different way. We introduce a constrained variational formulation of these modified Einstein equations. Then, drawing on analogies with the Henneaux-Teitelboim action for unimodular gravity, we construct different general-covariant actions resulting in these dynamics. The inverse of dynamical Newton constant is canonically conjugated to the Ricci scalar integrated over spacetime. Surprisingly, instead of the dynamical Newton constant one can formulate an equivalent theory with a dynamical Planck constant. Finally, we show that an axion-like field can play a role of the gravitational Newton constant or even of the quantum Planck constant.
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影响因子:
5
作者:
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通讯作者:
L. Smolin
DOI:
--
发表时间:
1982
期刊:
影响因子:
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作者:
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影响因子:
5.4
作者:
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影响因子:
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作者:
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