AUT Journal of Mathematics and Computing

AUT Journal of Mathematics and Computing

Module version of tensorizing maps and tensor products on $C^*$-algebras

Document Type : Original Article

Author
1 Department of Mathematics, CT.C, Islamic Azad University, Tehran, Iran
2 Institute of Cognitive Computational Science, CT.C, Islamic Azad University, Tehran, Iran
Abstract
For $C^*$-algebras $\mathfrak{A}, A$ and $ B $ where $ A $ and $ B $ are $\mathfrak{A}$-bimodules with compatible actions, we consider amalgamated $\mathfrak{A} $-module tensor product of $ A $ and $ B $ and study its relation with the C*-tensor product of $A$ and $B$ for the min and max norms. We introduce and study the notions of module tensorizing maps, module exactness, and module nuclear pairs of $ C^*$-algebras in this setting. We illustrate our results for the concrete examples of $C^*$-algebras on inverse semigroups.
Keywords
Subjects

[1]     M. Amini, Module amenability for semigroup algebras, Semigroup Forum, 69 (2004), pp. 243–254.
[2]     M. Amini, A. Bodaghi, and D. Ebrahimi Bagha, Module amenability of the second dual and module topological center of semigroup algebras, Semigroup Forum, 80 (2010), pp. 302–312.
[3]     M. Amini and R. Rezavand, Module nuclearity and module injectivity of C-modules, Bull. Math. Soc. Sci. Math. Roumanie (N.S.), 57(105) (2014), pp. 357–366.
[4]     A. Bodaghi and M. Amini, Module biprojective and module biflat Banach algebras, Politehn. Univ. Bucharest Sci. Bull. Ser. A Appl. Math. Phys., 75 (2013), pp. 25–36.
[5]     N. P. Brown and N. Ozawa, C-algebras and finite-dimensional approximations, vol. 88 of Graduate Studies in Mathematics, American Mathematical Society, Providence, RI, 2008.
[6]     J. Duncan and A. L. T. Paterson, C-algebras of inverse semigroups, Proc. Edinburgh Math. Soc. (2), 28 (1985), pp. 41–58.
[7]     A. Guichardet, Tensor products of C-algebras. Part I: Finite tensor products. Part II: Infinite tensor products, vol. 12-13 of Lecture Notes Series. Aarhus University, Matematisk Institut, Aarhus Universitet, Aarhus, 1969.
[8]     U. Haagerup, Injectivity and decomposition of completely bounded maps, in Operator algebras and their connections with topology and ergodic theory (Bu¸steni, 1983), vol. 1132 of Lecture Notes in Math., Springer, Berlin, 1985, pp. 170–222.
[9]     B. E. Johnson, Cohomology in Banach algebras, Memoirs of the American Mathematical Society, No. 127, American Mathematical Society, Providence, RI, 1972.
[10]  E. Kirchberg, Exact C-algebras, tensor products, and the classification of purely infinite algebras, in Proceedings of the International Congress of Mathematicians, Vol. 1, 2 (Zu¨rich, 1994), Birkh¨auser, Basel, 1995, pp. 943–954.
[11]  E. Kirchberg and S. Wassermann, Exact groups and continuous bundles of C-algebras, Math. Ann., 315 (1999), pp. 169–203.
[12]  G. Pisier, Tensor Products of C-Algebras and Operator Spaces: The Connes–Kirchberg Problem, vol. 96 of Lond. Math. Soc. Stud. Texts, Cambridge University Press, 2020.
[13]  A. Shirinkalam, Module tensorizing maps on C-algebras. arXiv:2204.08520 [math.OA], preprint.
[14]  A. Shirinkalam, A. Pourabbas, and M. Amini, Module and Hochschild cohomology of certain semigroup algebras, Funct. Anal. Appl., 49 (2015), pp. 315–318. Translation of Funktsional. Anal. i Prilozhen. 49 (2015), no. 4, 90–94.
[15]  M. Takesaki, On the cross-norm of the direct product of C-algebras, Tohoku Math. J. (2), 16 (1964), pp. 111– 122.
[16]  T. Turumaru, On the direct-product of operator algebras. I, Tohoku Math. J. (2), 4 (1952), pp. 242–251.