The KITP Public Lecture Series
Do I have to draw you a diagram? A tale of quantum gravity
sponsored by Friends of KITP
Almost all theoretical physicists believe that quantum field theories based on Einstein’s general relativity must necessarily be ill-defined. In technical parlance this is known as the “ultraviolet problem” of quantum gravity. But, is there really a problem? New insights and calculations based on the concept that gravity can be expressed in terms of two copies of standard particle theories suggest that quantum gravity may be much, much tamer. It may even be what is called “ultraviolet finite”. The relationship between gravity and gauge theories (which I will explain) also offers the hope of simplifying Einstein’s theory, as will be illustrated using black holes.