{"title":"Composition factors of polynomial representation of DAHA and q-decomposition numbers","authors":"Naoya Enomoto","doi":"10.1215/KJM/1260975035","DOIUrl":"https://doi.org/10.1215/KJM/1260975035","url":null,"abstract":"We determine the composition factors of the polynomial representation of DAHA, conjectured by M. Kasatani in [Kasa, Conjecture 6.4.]. He constructed an increasing sequence of subrepresentations in the polynomial representation of DAHA using the “multi-wheel condition”, and conjectured that it is a composition series. On the other hand, DAHA has two degenerate versions called the “degenerate DAHA” and the “rational DAHA”. The category O of modules over these three algebras and the category of modules over the v -Schur algebra are closely related. By using this relationship, we reduce the determination of composition factors of polynomial representations of DAHA to the determination of the composition factors of the Weyl module W ( n ) v for the v -Schur algebra. By using the LLT-Ariki type theorem of v -Schur algebra proved by Varagnolo-Vasserot, we determine the composition factors of W ( n ) v by calculating the upper global basis and crystal basis of Fock space of U q ( b sl (cid:2) ) when v is a primitive (cid:2) -th root of unity. This result gives a different way from the determination of decomposition number of W ( n ) v by H. Miyachi or B. Ackermann via the modular representation theory of the general linear groups.","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"41 1","pages":"441-473"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66113905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A note on strong unique continuation for normal elliptic systems with Gevrey coefficients","authors":"M. Tamura","doi":"10.1215/KJM/1260975040","DOIUrl":"https://doi.org/10.1215/KJM/1260975040","url":null,"abstract":"In this paper, we consider the strong unique continuation for normal elliptic systems whose coefficients are Gevrey class. By using Lerner’s lemma, we prove the Carleman estimate with some weight function.","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"49 1","pages":"593-601"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66114063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"$p$-compact groups as subgroups of maximal rank of Kac-Moody groups","authors":"J. Bover","doi":"10.1215/KJM/1248983031","DOIUrl":"https://doi.org/10.1215/KJM/1248983031","url":null,"abstract":"In [28], Kitchloo constructed a map f : BX → BK∧ p where K is a certain KacMoody group of rank two, X is a rank two mod p finite loop space and f is such that it induces an isomorphism between even dimensional mod p cohomology groups. Here B denotes the classifying space functor and (−)p denotes the Bousfield-Kan Fp-completion functor ([8]). This space X —or rather the triple (X∧ p , BX ∧ p , e) where e : X ' ΩBX— is a particular example of what is known as a p-compact group. These objects were introduced by Dwyer and Wilkerson in [15] as the homotopy theoretical framework to study finite loop spaces and compact Lie groups from a homotopy point of view. The foundational paper [15] together with its many sequels by Dwyer-Wilkerson and other authors represent now an active, well established research area which contains some of the most important recent advances in homotopy theory. While p-compact groups are nowadays reasonably well understood objects, our understanding of Kac-Moody groups and their classifying spaces from a homotopy point of view is far from satisfactory. The work of Kitchloo in [28] started a project which has also involved Broto, Saumell, Ruiz and the present author and has produced a series of results ([2], [3], [10]) which show interesting similarities between this theory and the theory of p-compact groups, as well as non trivial challenging differences. The goal of this paper is to extend the construction of Kitchloo that we have recalled above to produce rank-preserving maps BX → BK∧ p for a wide family of p-compact groups X. These maps can be understood as the homotopy analogues to monomorphisms, in a sense that will be made precise in section 13. We prove:","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"49 1","pages":"83-112"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66087215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Some results on local cohomology modules defined by a pair of ideals","authors":"L. Chu, Qing Wang","doi":"10.1215/KJM/1248983036","DOIUrl":"https://doi.org/10.1215/KJM/1248983036","url":null,"abstract":"Let $R$ be a commutative Noetherian ring, and let $I$ and $J$ be two ideals of $R$. Assume that $R$ is local with the maximal ideal ${mathfrak{m}}$, we mainly prove that (i) there exists an equality [{text{inf}}{i, mid H_{I,J}^i(M), {text{ is not Artinian}} }={text{inf}}{ {text{depth}}M_{mathfrak{p}} mid , {mathfrak{p}}in W(I, J)backslash {{mathfrak{m}}} }] for any finitely generated $R-$module $M$, where $W(I, J)={{mathfrak{p}} in {text{Spec}}(R) mid , I^n subseteq {mathfrak{p}}+J,, {text{for some positive integer}} ,n }$; (ii) for any finitely generated $R-$module $M$ with ${text{dim}}M=d$, $H_{I,J}^d(M)$ is Artinian. Also, we give a characterization to the supremum of all integers $r$ for which $H_{I,J}^r(M) neq 0$.","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"49 1","pages":"193-200"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1215/KJM/1248983036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66087663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Free-fall and heteroclinic orbits to triple collisions in the isosceles three-body problem","authors":"M. Shibayama","doi":"10.1215/KJM/1265899480","DOIUrl":"https://doi.org/10.1215/KJM/1265899480","url":null,"abstract":"","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"45 1","pages":"735-746"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66114237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sur le Cortex d'un groupe de Lie nilpotent","authors":"Imed Kédim, Megdiche Hatem","doi":"10.1215/KJM/1248983034","DOIUrl":"https://doi.org/10.1215/KJM/1248983034","url":null,"abstract":"Let $G$ be a connected and simply connected, nilpotent Lie group. In this paper, we show that the cortex of $G$ is a semi-algebraic set by means of a geometric characterization. It is also shown that the cortex is the image under a linear projection of a countable union of a semi-algebraic sets lying in the tensor product $T$($mathfrak{g}$)$otimes$ $mathfrak{g}$*.","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"49 1","pages":"161-172"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1215/KJM/1248983034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66087279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Central Limit Theorem for Linear Stochastic Evolutions","authors":"M. Nakashima","doi":"10.1215/KJM/1248983037","DOIUrl":"https://doi.org/10.1215/KJM/1248983037","url":null,"abstract":"We consider a Markov chain with values in [0,$infty$)$^{mathbb{z}d}$. The Markov chain includes some interesting examples such as the oriented site percolation, the directed polymers in random environment, and a time discretization of the binary contact process. We prove a central limit theorem for �the spatial distribution of population� when $dgeq 3$ and a certain square-integrability condition for the total population is satisfied. This extends a result known for the directed polymers in random environment to a large class of models.","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"49 1","pages":"201-224"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66087681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Gabor multipliers for weighted Banach spaces on locally compact abelian groups","authors":"S. S. Pandey","doi":"10.1215/KJM/1256219154","DOIUrl":"https://doi.org/10.1215/KJM/1256219154","url":null,"abstract":"We use a projective groups representation ρ of the unimodular group G× ˆ G on L 2 ( G ) to define Gabor wavelet transform of a function f with respect to a window function g , where G is a locally compact abelian group and ˆ G its dual group. Using these transforms, we define a weighted Banach H 1 , ρ w ( G ) and its antidual space H 1 ∼ , ρ w ( G ) , w being a moderate weight function on G × ˆ G . These spaces reduce to the well known Feichtinger algebra S 0 ( G ) and Banach space of Feichtinger distribution S (cid:2) 0 ( G ) respectively for w ≡ 1. We obtain an atomic decomposition of H 1 , ρ w ( G ) and study some properties of Gabor multipliers on the spaces L 2 ( G ) , H 1 , ρ w ( G ) and H 1 ∼ , ρ w ( G ). Finally, we prove a theorem on the compactness of Gabor multiplier operators on L 2 ( G ) and H 1 , ρ w ( G ), which reduces to an earlier result of Feichtinger [Fei 02, Theorem 5.15 (iv)] for w = 1 and G = R d .","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"49 1","pages":"235-254"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66113524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the critical values of $L$-functions of tensor product of base change for Hilbert modular forms","authors":"Cristian Virdol","doi":"10.1215/KJM/1256219161","DOIUrl":"https://doi.org/10.1215/KJM/1256219161","url":null,"abstract":"In this paper we generalize some results, obtained by Shimura, Yoshida on critical values of L-functions of l-adic representations attached to tensor product of Hilbert modular forms, to the critical values of L-functions of arbitrary base change to totally real number elds of l-adic representations attached to tensor product of Hilbert modular forms.","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"49 1","pages":"347-357"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1215/KJM/1256219161","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66113712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The rationality problem for four-dimensional linear actions","authors":"H. Kitayama, A. Yamasaki","doi":"10.1215/KJM/1256219162","DOIUrl":"https://doi.org/10.1215/KJM/1256219162","url":null,"abstract":"","PeriodicalId":50142,"journal":{"name":"Journal of Mathematics of Kyoto University","volume":"49 1","pages":"359-380"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66113757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}