We find the necessary and sufficient conditions for a sequential warped product manifold to be a quasi-Einstein manifold. We also investigate the necessary conditions for a sequential standard static space-time and a sequential generalized Robertson-Walker space-time to be a manifold of quasi-constant curvature.

中文翻译：

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关于准爱因斯坦顺序翘曲积流形

我们找到了将顺序翘曲积流形变为准爱因斯坦流形的必要和充分条件。我们还研究了序列标准静态时空和序列广义Robertson-Walker时空为准常曲率的流形的必要条件。