Jing Guo

The generalized Brans–Dicke theory (GBD), as one of the modified gravitational theories, was proposed previously and some interesting properties were found in this theory. Here we investigate the traversable-wormhole physics for GBD theory. Firstly, we derive the gravitational field equation in the framework of GBD wormhole geometry. The traversable wormhole could be gained in this theory. Secondly, using the classical reconstruction technique we originally derive an Lagrangian function for describing gravity in GBD theory. And the derived Lagrangian function for gravity could be satisfied with the requirement of the viable conditions, such as the local gravity tests and the cosmological constraints, etc. Thus, the viable model for cosmology, local gravity and traversable WH can be unified in a uniform Lagrangian quantity within the framework of GBD theory. Thirdly, given that the violation of the energy conditions (ECs) often induce some problems in theory, we explore the ECs of matter in the traversable wormhole. It is shown that the null EC, the weak EC and the dominated EC for the matter can be satisfied in the traversable-wormhole physics of GBD theory, which are different from the results given in GR. It seems that the theory of GBD owns the more logic technically and consistency formally than the theory of GR. Fourthly, some other properties of GBD traversable WH are explored, such as the total gravitational energy, the volume integral quantifier, the dynamical stability of the anisotropic matter, and the difference of the propagation of sound within the matter configuration. The results support the GBD to provide an interesting candidate for traversable WH.

The view of evil human nature is important in Chinese and western cultures. The thesis chooses evil human in St. Augustine’s thoughts and Hsun Tzu’s thoughts to compare and analyze evil in these two. St. Augustine, who is called “the Saint of God”, views the definition of evil, the resource of it, and salvations of it from the aspect of religious beliefs. He considers that evil is the privation of goodness and is not created by God. Because God is omnipotent and all-good, it is impossible for God to create evil. Evil results from the free will of human beings themselves. If people want to attain their salvations, they should use their free will to choose good will and follow the goodness given by God. Hsun Tzu, one of Confucian scholars, puts forward evil human nature which is totally different from good human nature in Confucianism. He views the definition of evil, the source of it, and ways to change evil into good from the angle of social reality in Warring States Period. In Hsun Tzu’s views, evil results from the uninhibited extension of sound physical needs and desires for living. Hsun Tzu believes that human nature is evil and goodness comes from nurture, therefore, converting evil into good is to change human nature through nurturing. By further comparison and analysis, the thesis further looks into these two perspectives from their differences and similarities. It states their differences from five aspects: backgrounds, ways to change evil to good, categories, historical status, and positions of human beings. Apart from those, the thesis also refers to their similarities to complement the comparative analysis. From comparison and analysis, we can draw two conclusions: first, evil human nature from Hsun Tzu is simple in connotation and relatively objective compared with the view of St. Augustine; second, St. Augustine thinks that human beings are equal in front of evil, which has positive significance compared with the ideas posed by Hsun Tzu who insists on the distinction between saint and ordinary people, between monarchs and their subjects