Some problems on the geometry of calibrated manifolds

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Tezin Türü: Doktora

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Matematik Bölümü, Türkiye

Tezin Onay Tarihi: 2019

Öğrenci: EYÜP YALÇINKAYA

Eş Danışman: İBRAHİM ÜNAL, MUSTAFA HURŞİT ÖNSİPER

Özet:

In this thesis,w estudy three problems ont he geometry of calibrated manifolds,which are Riemannian manifolds equipped with a special closed differential form called a calibration. Firstly, we compute the homology of Grasmannian manifold of oriented 3-planes in R6, namely G+ 3 (R6), and its special submanifold called SLAG, the set of 3-planes in G+ 3 (R6) determined by the special Lagrangian calibration on CalabiYau 3-fold C3 ∼ = R6. We make an immediate application of these computations. Secondly,weinvestigatearelatedproblemontheembeddingoforientedclosedmanifoldsintoCn asspecialLagrangian-free(sLag-free). Finally,westudythegeography of symplectic 8-dimensional manifolds and obtain certain results on the existence of symplectic 8-manifolds with Spin(7)-structure.