有限密度下的费米子符号问题和大Nc轨道等价
The Fermion Sign Problem at Finite Density, and Large Nc Orbifold Equivalence
摘要：
有限重子密度下的QCD研究受到费米子符号问题的严重阻碍。因此，我们没有已知的第一原理方法来研究核物质，或中子星从QCD。从表面上看，大的Nc极限似乎并没有简化问题。然而，在这个极限中，人们可以利用强耦合规范理论之间存在的对偶。我们的重点将是最近在有限密度下发现的一些相当新颖的orbifold等价。这些等价关系涉及强耦合理论困扰的一个符号问题，强耦合理论的符号问题。因此，这样的对偶给更深入的了解符号问题的性质，并可能提供一种方法来模拟QCD在有限密度在大Nc极限。
英文摘要：
The study of QCD at finite baryon density is severely hampered by the so-called fermion sign problem. As a result, we have no known first principles approach to study nuclear matter, or neutron stars from QCD. On the surface, the large Nc limit does not seem to simplify matters. In this limit, however, one can exploit dualities that exist between strongly coupled gauge theories. Our focus will be on some rather novel orbifold equivalences that have recently been discovered at finite density. These equivalences relate strongly coupled theories plagued by a sign problem, to strongly coupled theories free of sign problems. As a result, such dualities give deeper insight into the nature of the sign problem and possibly provide a way to simulate QCD at finite density in the large Nc limit.
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