Quantum Field Theory and Cosmology

PI将研究在加速膨胀阶段发生的一类量子效应，称为“原始膨胀”。“这些效应做了许多有趣的事情，例如改变基本粒子的质量和场强，以及改变宇宙膨胀的速度。 这些效应的一个重要特性是，它们会随着时间的推移而增长，直到传统的近似技术失效。 PI将完成一种新技术的开发，通过这种技术，这类量子效应可以进化到任意的晚期。 这项工作将包括与Nikolaos Tsamis教授（希腊克里特大学）和Tomislav Proklav教授（荷兰乌得勒支大学）进行互访合作。 重要的项目也将涉及PI的研究生：苗顺培小姐和埃姆雷·卡亚先生。其中一些效应可能会引起目前可观察到的后果，如原始扰动光谱的扭曲，非常长波长粒子的大量存在，以及引力定律的修改。 这些效应中的某些甚至完全有可能主导着当前宇宙的大尺度演化。除了决定这些问题外，该项目还将导致膨胀宇宙量子场论的坚实进展。

The PI will study a class of quantum effects which take place during the phase of accelerated expansion known as "primordial inflation." These effects do many fascinating things such as changing the masses and field strengths of fundamental particles, and changing the rate at which the universe expands. An important property of these effects is that they grow with time until conventional approximation techniques break down. The PI will complete the development of a new technique with which this class of quantum effects can be evolved to arbitrarily late times. The work will involve reciprocal visits to collaborate with Professor Nikolaos Tsamis (University of Crete, Greece) and Professor Tomislav Prokopec (University of Utrecht, The Netherlands). Important projects will also involve the PI's graduate students: Miss Shun-Pei Miao and Mr.Emre Kahya.Some of these effects may give rise to currently observable consequences such as distortions in the spectrum of primordial perturbations, anomalously large populations of very long wavelength particles, and modifications of the gravitational force law. It seems entirely possible that certain of these effects are even dominating the current large scale evolution of the universe. In addition to deciding these issues, this project will lead to solid advances in quantum field theory on an expanding universe.