topology (point-set topology, point-free topology)
see also differential topology, algebraic topology, functional analysis and topological homotopy theory
Basic concepts
fiber space, space attachment
Extra stuff, structure, properties
Kolmogorov space, Hausdorff space, regular space, normal space
sequentially compact, countably compact, locally compact, sigma-compact, paracompact, countably paracompact, strongly compact
Examples
Basic statements
closed subspaces of compact Hausdorff spaces are equivalently compact subspaces
open subspaces of compact Hausdorff spaces are locally compact
compact spaces equivalently have converging subnet of every net
continuous metric space valued function on compact metric space is uniformly continuous
paracompact Hausdorff spaces equivalently admit subordinate partitions of unity
injective proper maps to locally compact spaces are equivalently the closed embeddings
locally compact and second-countable spaces are sigma-compact
Theorems
Analysis Theorems
Where the braid group is the group of continuous motions of sets of distinct points in the Euclidean plane, the loop braid group (Dahm 62, Goldsmith 81) is the group of continuous motions of disjoint unknotted loops in 3d Euclidean space.
Accordingly, the role that the braid group plays in 3d TQFTs such as Chern-Simons theory/Reshetikhin-Turaev theory with point-like defects (anyons), the loop braid group plays in 4d TQFT with line defects (codimension-2 defect branes).
Original articles:
D. Dahm, A generalization of braid theory, PhD thesis, Princeton University, 1962.
Deborah L. Goldsmith, The theory of motion groups, Michigan Math. J. 28(1): 3-17 (1981) (doi:10.1307/mmj/1029002454)
Xiao-Song Lin, The motion group of the unlink and its representations, in:
Xiao-Song Lin’s Unpublished Papers (doi:10.1142/9789812819116_others01), Part B of:
Kevin Lin, Zhenghan Wang, Weiping Zhang (eds.) Topology and Physics: Proceedings of the Nankai International Conference in Memory of Xiao-Song Lin, Tianjin, China, 27-31 July 2007. World Scientific, 2008 (doi:10.1142/6907)
See also:
Discussion via 4d TQFT and higher gauge theory/higher parallel transport:
in 4d BF-theory:
John Baez, Derek Wise, Alissa Crans, Exotic Statistics for Strings in 4d BF Theory, Adv. Theor. Math. Phys. 11:707-749, 2007 (arXiv:gr-qc/0603085)
Alex Bullivant, João Faria Martins, Paul Martin, Representations of the Loop Braid Group and Aharonov-Bohm like effects in discrete (3+1)-dimensional higher gauge theory, Advances in Theoretical and Mathematical Physics Volume 23 (2019) Number 7 (arXiv:1807.09551)
and in the 3d toric code-4d TQFT:
Liang Kong, Yin Tian, Zhi-Hao Zhang, Section 2.2 of: Defects in the 3-dimensional toric code model form a braided fusion 2-category, J. High Energ. Phys. 2020, 78 (2020) (arXiv:2009.06564, doi:10.1007/JHEP12(2020)078)
Zhen Bi, Yi-Zhuang You, Cenke Xu, Anyon and loop braiding statistics in field theories with a topological $\Theta$ term, Phys. Rev. B 90 (2014) 081110(R) (doi:10.1103/PhysRevB.90.081110)
and in 3d symmetry protected topological phases:
Chao-Ming Jian, Xiao-Liang Qi, Layer Construction of 3D Topological States and String Braiding Statistics, Phys. Rev. X 4 (2014) 041043 $[$doi:10.1103/PhysRevX.4.041043$]$
Shenghan Jiang, Andrej Mesaros, and Ying Ran, Generalized Modular Transformations in (3+1)D Topologically Ordered Phases and Triple Linking Invariant of Loop Braiding, Phys. Rev. X 4 031048 (doi:10.1103/PhysRevX.4.031048)
and similar models in condensed matter theory:
Chenjie Wang, Michael Levin, Braiding Statistics of Loop Excitations in Three Dimensions, Phys. Rev. Lett. 113 (2014) 080403 (doi:10.1103/PhysRevLett.113.080403)
AtMa P. O. Chan, Peng Ye, Shinsei Ryu, Braiding with Borromean Rings in (3+1)-Dimensional Spacetime, Phys. Rev. Lett. 121, 061601 (2018) [arXiv:1703.01926]
Zhi-Feng Zhang, Qing-Rui Wang, Peng Ye, Wilson Operators, Non-Abelian Fusion Rules, and Loop Shrinking Rules of Borromean Rings Topological Order [arXiv:2208.09228]
Relation to braided tensor categories:
Relation to integrable systems:
Last revised on October 25, 2022 at 05:04:58. See the history of this page for a list of all contributions to it.