  The existence of a finite electric dipole moment (EDM) d_a of the
closed-shell atom Yb implies parity and time reversal violations involving the
nuclear sector. An important effect which can contribute to the Yb EDM is the
tensor-pseudotensor electron-nucleus interaction characterized by the coupling
constant C_T. Within the Standard Model (SM) of particle physics C_T=0, as this
form of interaction is not allowed. If a finite d_a of Yb is observed in
experiments, then an estimate of C_T can be obtained by combining with the
theoretical calculations. A non-zero C_T implies physics beyond the standard
model. In this paper we present the result of our ab initio calculation of the
EDM Yb using different many-body methods.
