CoInvestigator(Kenkyūbuntansha) 
OHYAMA Yosiyuki Tokyo Woman's Christian University, Department of mathematics, Asocciate Professor, 文理学部, 助教授 (80223981)
SAEKI Akihiro Nagoya Institute of Technology, Faculty of Engineering, Asocciate Professor, 工学研究科, 助教授 (50270997)
ADACHI Tosiaki Nagoya Institute of Technology, Faculty of Engineering, Professor, 工学研究科, 教授 (60191855)

Research Abstract 
The Bernstein Problem about minimal graphs in an ndimensional Euclidean space have been solved. After that, many variations of the Bernstein problem were considered. As an generalization, we know that complete, an orientable, stable minimal surface in a 3dimensional Euclidean space is only a plane. If we consider a compact, oerientable, minimal surface in a 3dimensional Riemannian flat torus, then we see that it is totally geodesic, because the deformation in the direction of the unit normal vector field makes the area to be small. Micallef proved that a compact, orientabl, stable minimal surface in an in a 4dimensional Riemannian flat torus is horomorphic for a suitable orthogonal complex structure of the torus. We expect that compact, We expect that compact, orientable stable minimal surface in a 4dimensional riemannian flat torus is holomorphic for a suitable orthogonal complex structure of the torus. We expect that compact, orientable, stable minimal surface in lower dimension
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al Riemannian flat tori are horomorphic. Recently, Arezzo and Micallef proved the existence of nonholomorphic, compact, orientable, stable minimal surface of genus g (not less than 7,9,10) in a ((2g2),(2g4),(2g6))dimensional Riemannian flat torus. They expect the existence of a nonholomorphic, compact, orientable, stable minimal surface of genus g (not less than 4) in a 8dimensional Riemannian flat torus. On the other hand, investigating the difference between stableness and area areaminimizingness of compact, orientablek minimal surface in Riemannian flat tori, Ejiri have given the following problem: Are compact, orientablestable minimal surfaces of genus g in a 2gdimensional Riemannian flat torus areaminimizing in the same homotopy class? In this research, we obtain the following fact: Let n be a natural number and M_g(n) the subset of the moduli M_g of Riemann surfaces of genus g(not less than 4) where the element of M_g(n) admits a stable minimal immersion in a 7demen Rimannian flat torus containing n stable minimal surfaces with different areas in the same homotopy class. Then we obtain the following. Theorem M_g(n) is dense in M_g.. Hence, we know that the Arezzo and Micallef conjecture is true and obtain a counter example for Ejiiri's problem Less
