量子引力的其它理论，包括弦论和圈量子引力，对新人来说都更难以涉足其中。
Other theories of quantum gravity, including string theory and loop quantum gravity, are far more difficult for newcomers to embrace.
这种时空的颗粒性源于超弦理论与环圈量子重力学的最重要差异。
This granularity emerges from what is the most important difference between the two theories.
这个超弦理论的对头叫做“环圈量子重力学”，于1986年由宾西法尼亚州立大学的Abhay a shtekar提出。
Loop quantum gravity, as this rival is known, was dreamed up in 1986 by Abhay Ashtekar, of Pennsylvania State University.
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