Title: The Constrained State of Minimum Energy and the Effective Equation of Motion

Presenter: Amin Akhavan (IPM)

Time & Date: Wednesday, June 18th, 2025 (Khordad 28st, 1404), *14:00* (IRST)

Place: Room 17

Abstract: We define the state of minimum energy while the expectation values of the field operators and their time derivatives in a determined moment in such a state are constrained. As an axiom, we consider such a state as the background of the quantum field theory. As an example, we consider the scalar field with λ/4! Φ4 interaction. To the third order of perturbation, we obtain the equation of motion of the dynamic expectation value of the scalar field in the defined state.