On the new intersection theorem for totally reflexive modules

• Autores: Kamran Divaani-Aazar, Fatemeh Mohammadi Aghjeh Mashhad, Ehsan Tavanfar, Massoud Tousi
• Localización: Collectanea mathematica, ISSN 0010-0757, Vol. 71, Fasc. 3, 2020, págs. 369-381
• Idioma: inglés
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• Resumen

  • Let (R,\mathfrak {m},k) be a local ring. We establish a totally reflexive analogue of the New Intersection Theorem, provided for every totally reflexive R-module M, there is a big Cohen–Macaulay R-module B_M such that the socle of B_M\otimes _RM is zero. When R is a quasi-specialization of a {\text {G}}-regular local ring or when M has complete intersection dimension zero, we show the existence of such a big Cohen–Macaulay R-module. It is conjectured that if R admits a non-zero Cohen–Macaulay module of finite Gorenstein dimension, then it is Cohen–Macaulay. We prove this conjecture if either R is a quasi-specialization of a {\text {G}}-regular local ring or a quasi-Buchsbaum local ring.