弦论，量子场论和宇宙学。感兴趣的领域包括引力理论和量子场理论之间的联系，全息规范/引力对偶，强相关的物质量子相的行为以及早期宇宙的演化。博士学位课程包括一系列核心课程，其中包括一些高级研究生课程，这些课程提供了从长远来看非常重要的物理学广泛背景，与学生研究领域相关的专门课程以及针对该学科的研究。博士学位论文。在其他机构从事研究生工作的学生可以在其候选申请书中包括在其他机构进行的相关课程，其中包括他们的所有课程准备以及论文的研究计划。利哈伊大学物理系提供的课程可导致获得天文学学士学位，获得天体物理学学士学位
String theory, quantum field theory and cosmology. Areas of interest include the connection between gravitational theories and quantum field theories, holographic gauge/gravity dualities, the behavior of strongly correlated quantum phases of matter, and the evolution of the early universe. The Ph D program includes a set of core courses, including some at the advanced graduate level that provide the broad background in physics that is so important in the long run, specialized courses relevant to the research area of the student, and the research for the Ph D dissertation. Students entering with graduate level work at other institutions may include relevant courses taken at the other institutions in their proposal for candidacy, which includes all their course preparation as well as the research proposal for the dissertation. The Department of Physics at Lehigh University offers programs leading to the B.A. in astronomy, the B.S. in astrophysics, and to the B.A., B.S., M.S., and Ph.D. degrees in physics, as well as a summer research program for undergraduates. Research areas include astronomy and astrophysics, atomic, molecular, and optical physics, biophysics, computational physics, condensed-matter physics, general relativity, cosmology, and string theory, high-energy and accelerator physics, nano science, non-linear optics and photonics, plasma physics, soft-condensed matter and complex fluids, and statistical physics.