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Quarterly Journal of Mathematics最新文献

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JNR monopoles JNR单极
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmath/haaa033
Michael K Murray;Paul Norbury
{"title":"JNR monopoles","authors":"Michael K Murray;Paul Norbury","doi":"10.1093/qmath/haaa033","DOIUrl":"https://doi.org/10.1093/qmath/haaa033","url":null,"abstract":"We review the theory of JNR, mass \u0000<tex>$frac{1}{2}$</tex>\u0000 hyperbolic monopoles in particular their spectral curves and rational maps. These are used to establish conditions for a spectral curve to be the spectral curve of a JNR monopole and to show that the rational map of a JNR monopole arises by scattering using results of Atiyah. We show that for JNR monopoles the holomorphic sphere has a remarkably simple form and show that this can be used to give a formula for the energy density at infinity. In conclusion, we illustrate some examples of the energy density at infinity of JNR monopoles.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/qmath/haaa033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Index Theorem for Toeplitz Operators as a Corollary of Bott Periodicity 作为Bott周期性推论的Toeplitz算子的指标定理
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmath/haab008
Paul F Baum;Erik Van Erp
{"title":"The Index Theorem for Toeplitz Operators as a Corollary of Bott Periodicity","authors":"Paul F Baum;Erik Van Erp","doi":"10.1093/qmath/haab008","DOIUrl":"https://doi.org/10.1093/qmath/haab008","url":null,"abstract":"This is an expository paper about the index of Toeplitz operators, and in particular Boutet de Monvel’s theorem [5]. We prove Boutet de Monvel’s theorem as a corollary of Bott periodicity, and independently of the Atiyah-Singer index theorem.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The central sphere of an ALE space ALE空间的中心球体
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmath/haaa051
Nigel Hitchin
{"title":"The central sphere of an ALE space","authors":"Nigel Hitchin","doi":"10.1093/qmath/haaa051","DOIUrl":"https://doi.org/10.1093/qmath/haaa051","url":null,"abstract":"We consider the induced metric on the spherical fixed point set of a circle action on an ALE space and describe it by using the algebraic geometry of rational curves on algebraic surfaces, in particular the lines on a cubic.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/qmath/haaa051","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Segal’s Gamma rings and universal arithmetic 西格尔伽玛环和通用算术
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmath/haaa042
Alain CONNES;Caterina CONSANI
{"title":"Segal’s Gamma rings and universal arithmetic","authors":"Alain CONNES;Caterina CONSANI","doi":"10.1093/qmath/haaa042","DOIUrl":"https://doi.org/10.1093/qmath/haaa042","url":null,"abstract":"Segal’s Γ-rings provide a natural framework for absolute algebraic geometry. We use G. Almkvist’s global Witt construction to explore the relation with J. Borger \u0000<tex>${mathbb F}_1$</tex>\u0000-geometry and compute the Witt functor-ring \u0000<tex>${mathbb W}_0({mathbb S})$</tex>\u0000 of the simplest Γ-ring \u0000<tex>${mathbb S}$</tex>\u0000. We prove that it is isomorphic to the Galois invariant part of the BC-system, and exhibit the close relation between λ-rings and the Arithmetic Site. Then, we concentrate on the Arakelov compactification \u0000<tex>${overline{{rm Spec,}{mathbb Z}}}$</tex>\u0000 which acquires a structure sheaf of \u0000<tex>${mathbb S}$</tex>\u0000-algebras. After supplying a probabilistic interpretation of the classical theta invariant of a divisor D on \u0000<tex>${overline{{rm Spec,}{mathbb Z}}}$</tex>\u0000, we show how to associate to D a Γ-space that encodes, in homotopical terms, the Riemann–Roch problem for D.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Skyrmions, Tetrahedra and Magic Numbers Skyrmions、四面体和幻数
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmathj/haaa025
Nicholas S Manton
{"title":"Skyrmions, Tetrahedra and Magic Numbers","authors":"Nicholas S Manton","doi":"10.1093/qmathj/haaa025","DOIUrl":"10.1093/qmathj/haaa025","url":null,"abstract":"Michael Atiyah’s interest in Skyrmions and their relationship to monopoles and instantons is recalled. Some approximate models of Skyrmions with large baryon numbers are then considered. Skyrmions having particularly strong binding are clusters of unit baryon number Skyrmions arranged as truncated tetrahedra. Their baryon numbers, \u0000<tex>$B = 4 ,, 16 ,, 40 ,, 80 ,, 140 ,, 224$</tex>\u0000, are the tetrahedral numbers multiplied by four, agreeing with the magic proton and neutron numbers \u0000<tex>$2 ,, 8 ,, 20 ,, 40 ,, 70 ,, 112$</tex>\u0000 occurring in the nuclear shell model in the absence of strong spin-orbit coupling.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/qmathj/haaa025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47013671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Deformations Of Multivalued Harmonic Functions 多值调和函数的变形
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmath/haab018
Simon Donaldson
{"title":"Deformations Of Multivalued Harmonic Functions","authors":"Simon Donaldson","doi":"10.1093/qmath/haab018","DOIUrl":"https://doi.org/10.1093/qmath/haab018","url":null,"abstract":"We consider harmonic sections of a bundle over the complement of a codimension 2 submanifold in a Riemannian manifold, which can be thought of as multivalued harmonic functions. We prove a result to the effect that these are stable under small deformations of the data. The proof is an application of a version of the Nash-Moser implicit function theorem.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/8016816/9514696/09519170.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Dk Gravitational Instantons as Superpositions of Atiyah–Hitchin and Taub–NUT Geometries 作为Atiyah-Hitchin和Taub-NUT几何叠加的Dk引力瞬子
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmath/haab002
B J Schroers;M A Singer
{"title":"Dk Gravitational Instantons as Superpositions of Atiyah–Hitchin and Taub–NUT Geometries","authors":"B J Schroers;M A Singer","doi":"10.1093/qmath/haab002","DOIUrl":"https://doi.org/10.1093/qmath/haab002","url":null,"abstract":"We obtain D\u0000<inf>k</inf>\u0000 ALF gravitational instantons by a gluing construction which captures, in a precise and explicit fashion, their interpretation as nonlinear superpositions of the moduli space of centred SU(2) monopoles, equipped with the Atiyah–Hitchin metric, and k copies of the Taub–NUT manifold. The construction proceeds from a finite set of points in euclidean space, reflection symmetric about the origin, and depends on an adiabatic parameter which is incorporated into the geometry as a fifth dimension. Using a formulation in terms of hyperKähler triples on manifolds with boundaries, we show that the constituent Atiyah–Hitchin and Taub–NUT geometries arise as boundary components of the five-dimensional geometry as the adiabatic parameter is taken to zero.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/qmath/haab002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Infinite-Dimensional Degree Theory and Ramer’S Finite Co-Dimensional Differential Forms 无限维度理论与Ramer有限协维微分形式
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmath/haab022
K. D. Elworthy
{"title":"Infinite-Dimensional Degree Theory and Ramer’S Finite Co-Dimensional Differential Forms","authors":"K. D. Elworthy","doi":"10.1093/qmath/haab022","DOIUrl":"https://doi.org/10.1093/qmath/haab022","url":null,"abstract":"Infinite-dimensional degree theory, especially for Fredholm maps with positive index as developed with Tromba, is combined with Ramer’s unpublished thesis work on finite co-dimensional differential forms. As an illustrative example, the approach of Nicolaescu and Savale to the Gauss–Bonnet–Chern theorem for vector bundles is reworked in this framework. Other examples mentioned are Kokarev and Kuksin’s approach to periodic differential equations and to forced harmonic maps. A discussion about how such forms and their constructions and cohomology relate to constructions for diffusion measures on path and loop spaces is also included.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/qmath/haab022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Consistency of M-Theory on Non-Orientable Manifolds 非定向流形上m理论的一致性
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-12-01 DOI: 10.1093/qmath/haab007
Daniel S Freed;Michael J Hopkins
{"title":"Consistency of M-Theory on Non-Orientable Manifolds","authors":"Daniel S Freed;Michael J Hopkins","doi":"10.1093/qmath/haab007","DOIUrl":"https://doi.org/10.1093/qmath/haab007","url":null,"abstract":"We prove that there is no parity anomaly in M-theory in the low-energy field theory approximation. Our approach is computational. We determine the generators for the 12-dimensional bordism group of pin manifolds with a w\u0000<inf>1</inf>\u0000-twisted integer lift of w\u0000<inf>4</inf>\u0000; these are the manifolds on which Wick-rotated M-theory exists. The anomaly cancellation comes down to computing a specific η-invariant and cubic form on these manifolds. Of interest beyond this specific problem are our expositions of computational techniques for η-invariants, the algebraic theory of cubic forms, Adams spectral sequence techniques and anomalies for spinor fields and Rarita–Schwinger fields.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/qmath/haab007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49950717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
K-SEMISTABILITY OF OPTIMAL DEGENERATIONS 最优退化的k -半稳定性
IF 0.7 4区 数学
Quarterly Journal of Mathematics Pub Date : 2020-03-01 DOI: 10.1093/qmathj/haaa012
Ruadhaí Dervan
{"title":"K-SEMISTABILITY OF OPTIMAL DEGENERATIONS","authors":"Ruadhaí Dervan","doi":"10.1093/qmathj/haaa012","DOIUrl":"https://doi.org/10.1093/qmathj/haaa012","url":null,"abstract":"K-polystability of a polarized variety is an algebro-geometric notion conjecturally equivalent to the existence of a constant scalar curvature Kähler metric. When a variety is K-unstable, it is expected to admit a ‘most destabilizing’ degeneration. In this note we show that if such a degeneration exists, then the limiting scheme is itself relatively K-semistable.","PeriodicalId":54522,"journal":{"name":"Quarterly Journal of Mathematics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/qmathj/haaa012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49966561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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