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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1904.04539math.GT
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单纯体积的谱

The spectrum of simplicial volume

Nicolaus Heuer, Clara Loeh

摘要:

群同调中的新构造允许我们制造具有受控单纯体积的高维流形。证明了在$\mathbb{R}_{\geq 0}$中,对于任意大于3的维数,可定向闭连通流形的单纯体积集是稠密的。在四维空间中,我们证明了每个非负有理数都是某个可定向闭连通四维流形的单纯体积。我们的群论结果涉及稳定的换向器长度的$l^1$ -半范数的某些奇异同调类的程度2。这些结果的输出被转换成多方面的建设,使用交叉产品和托姆实现。

英文摘要:

New constructions in group homology allow us to manufacture high-dimensional manifolds with controlled simplicial volume. We prove that for every dimension bigger than 3 the set of simplicial volumes of orientable closed connected manifolds is dense in $\mathbb{R}_{\geq 0}$. In dimension 4 we prove that every non-negative rational number is the simplicial volume of some orientable closed connected 4-manifold. Our group theoretic results relate stable commutator length to the $l^1$-semi-norm of certain singular homology classes in degree 2. The output of these results is translated into manifold constructions using cross-products and Thom realisation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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