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Abhaya shtekar提出。
Loop quantum gravity, as this rival is known, was dreamed up in 1986 by Abhay Ashtekar, of Pennsylvania State University.
宾西法尼亚州州立大学和加利福尼亚工艺州立大学已经在商谈中，而其他学校都在观望和等待。
Penn State University and California Polytechnic State University, to name two, have been in talks, while other schools are watching and waiting.
宾西法尼亚州州立大学和加利福尼亚工艺州立大学已经在商谈中，而其他学校都在观望和等待。
Penn State University and California Polytechnic State University, to name two, have been in talks, while other schools are watching and waiting.
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