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The discovery of ＂twin quasi-stellar objects＂ arose interests among astronomers and astrophysicists to study gravitational leasing problem. Deviation of light from straight path is caused by the presence of massive objects, i.e., the presence of gravitational field according to the general theory of relativity. It is shown that the low energy effective field theory on D-branes is of the Born-Infeld type. In this work a Born-Infeld type gravitational field is pasttflated. An explicit representation of the angular deviation of light path is derived based on the space time metric in the Born-Infeld theory. 相似文献
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指出了对文科学生开设物理课程的必要性和重要性.提出了保证教学效果的几个方面:教师、切入点、内容、方法和手段,论述了它们的重要性,并提出了建议.结合教学经验,指出实验是最受文科学生欢迎的教学形式,建议在课程中多设置演示实验和分组实验. 相似文献
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1 Introduction The nonlinear Born-Infeld ( B-I) type theory hasbeen widely discussed ,and B-I type Lagrangians con-sidered in strings theory[1-9].It is of interest to discussthe angular deflection of light path in this theory.Inthe string theory, effective actions of fields containboth the quadratic and higher orders terms ,leading tonon-linear field equations .It was shown[10-15]that thelow-energy effective action is precisely a B-I typeaction[16].In the B-I type theory of electricweak a… 相似文献
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