{"title":"A note on the infinite number of exact Lagrangian fillings for spherical spuns","authors":"R. Golovko","doi":"10.2140/pjm.2022.317.143","DOIUrl":"https://doi.org/10.2140/pjm.2022.317.143","url":null,"abstract":"In this short note we discuss high-dimensional examples of Legendrian submanifolds of the standard contact Euclidean space with an infinite number of exact Lagrangian fillings up to Hamiltonian isotopy. They are obtained from the examples of Casals and Ng by applying to them the spherical spinning construction.","PeriodicalId":54651,"journal":{"name":"Pacific Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44181021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cohopfian groups and accessible group classes","authors":"F. Giovanni, M. Trombetti","doi":"10.2140/pjm.2021.312.457","DOIUrl":"https://doi.org/10.2140/pjm.2021.312.457","url":null,"abstract":"","PeriodicalId":54651,"journal":{"name":"Pacific Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42697804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Origamis associated to minimally intersecting filling pairs","authors":"Tarik Aougab, W. Menasco, M. Nieland","doi":"10.2140/pjm.2022.317.1","DOIUrl":"https://doi.org/10.2140/pjm.2022.317.1","url":null,"abstract":"Let $S_{g}$ denote the closed orientable surface of genus $g$. In joint work with Huang, the first author constructed exponentially-many (in $g$) mapping class group orbits of pairs of simple closed curves whose complement is a single topological disk. Using different techniques, we improve on this result by constructing factorially-many (again in $g$) such orbits. These new orbits are chosen so that the absolute value of the algebraic intersection number is equal to the geometric intersection number, implying that each pair naturally gives rise to an origami. We collect some rudimentary experimental data on the corresponding $SL(2, mathbb{Z})$-orbits and suggest further study and conjectures.","PeriodicalId":54651,"journal":{"name":"Pacific Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49573527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Certain Fourier operators on GL1 and local\u0000Langlands gamma functions","authors":"Dihua Jiang, Zhilin Luo","doi":"10.2140/pjm.2022.318.339","DOIUrl":"https://doi.org/10.2140/pjm.2022.318.339","url":null,"abstract":". For a split reductive group G over a number field k , let ρ be an n -dimensional complex representation of its complex dual group G ∨ ( C ). For any irreducible cuspidal automorphic representation σ of G ( A ), where A is the ring of adeles of k , in [JL21], the authors introduce the ( σ, ρ )-Schwartz space S σ,ρ ( A × ) and ( σ, ρ )-Fourier operator F σ,ρ , and study the ( σ, ρ, ψ )-Poisson summation formula on GL 1 , under the assumption that the local Langlands functoriality holds for the pair ( G, ρ ) at all local places of k , where ψ is a non-trivial additive character of k A . Such general formulae on GL 1 , as a vast generalization of the classical Poisson summation formula, are expected to be responsible for the Langlands conjecture ([ L70]) on global functional equation for the automorphic L -functions L ( s, σ, ρ ). In order to understand such Poisson summation formulae, we continue with [JL21] and develop a further local theory related to the ( σ, ρ )-Schwartz space S σ,ρ ( A × ) and ( σ, ρ )-Fourier operator F σ,ρ . More precisely, over any local field k ν of k , we define distribution kernel functions k σ ν ,ρ,ψ ν ( x ) on GL 1 that represent the ( σ ν , ρ )-Fourier operators F σ ν ,ρ,ψ ν as convolution integral operators, i.e. generalized Hankel transforms, and the local Langlands γ -functions γ ( s, σ ν , ρ, ψ ν ) as Mellin transform of the kernel functions. As a consequence, we show that any local Langlands γ -functions are the gamma functions in the sense of I. and I. Piatetski-Shapiro in [GGPS] and of A. Weil in [W66].","PeriodicalId":54651,"journal":{"name":"Pacific Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42077823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}