Configuration spaces of disks in an infinite strip
Configuration spaces of disks in an infinite strip
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无限带状磁盘配置空间
DOI:
10.1007/s41468-021-00070-6
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发表时间:
2021
期刊:
影响因子:
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通讯作者:
MacPherson, Robert
中科院分区:
文献类型:
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作者:
Alpert, Hannah;Kahle, Matthew;MacPherson, Robert
We study the topology of the configuration spacesofnhard disks of unit diameter in an infinite strip of widthw. We describe ranges of parameter or “regimes”, where homologybehaves in qualitatively different ways. We show that if, then the homologyis isomorphic to the homology of the configuration space of points in the plane,. The Betti numbers ofwere computed by Arnold (The cohomology ring of the colored braid group. Springer Berlin, pp 183–186, 2014), and so as a corollary of the isomorphism,is a polynomial innof degree 2j. On the other hand, we show that if, thengrows exponentially withn. Most of our work is in carefully estimatingin this regime. We also illustrate, for everyn, the homological “phase portrait” in the (w,j)-plane—the parameter values where homologyis trivial, nontrivial, and isomorphic with. Motivated by the notion of phase transitions for hard-spheres systems, we discuss these as the “homological solid, liquid, and gas” regimes.
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DOI:
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期刊:
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