# Analysis Seminar

#### Field Theory for Four Fundamental Interactions

**Speaker:**
Shouhong Wang, University of Indiana

**Location:**
Warren Weaver Hall 1302

**Date:**
Thursday, October 9, 2014, 11 a.m.

**Synopsis:**

First, we present two basic principles, the principle of interaction dynamics (PID) and the principle of representation invariance (PRI). Intuitively, PID takes the variation of the action functional under energy-momentum conservation constraint. PID offers a completely different and natural way of introducing Higgs fields. For gravity, we show that PID is the direct consequence of Einstein's principle of general relativity and the presence of dark matter and dark energy. PRI requires that the SU(N) gauge theory be independent of representations of SU(N). PRI has remarkably rich physical consequences.

Second, we briefly introduce a field theory coupling the four fundamental interactions, based only on a few fundamental principles and symmetries. This theory leads to insights to the understanding of such challenging problems as the dark matter and dark energy and quark confinement. This is joint work with Tian Ma.