Much of his work bears on the concept of parallel universes : evaluating evidence for infinite space and cosmological inflation ; developing insights into quantum decoherence ; and studying the possibility that the amplitude of microwave background fluctuations , the dimensionality of spacetime and the fundamental laws of physics can vary from place to place 许多他的工作都含有平行宇宙的概念：评估无限大空间与宇宙暴胀的证据，发展对量子去相干现象的洞察，以及研究诸如微波背景辐射涨落的振幅、时空的维度以及物理的基本定律可随位置而变化的可能性。
The big bang model , which states that almost 14 billion years ago the universe started expanding from a state of extremely high density and temperature , is able to explain galaxy motions , the abundance of hydrogen and helium , and the properties of the cosmic microwave background ( cmb ) , the remnant heat from the expanding and cooling gas 大霹雳模型指出，宇宙于约140亿年前自极度高温、高密度的状态开始扩张，这理论不但可以解释星系运动以及宇宙中氢与氦的含量，而且还预测了宇宙扩张时，冷却中气体的残馀热辐射，也就是宇宙微波背景的各项性质。
