The finite temperature field theory have two formalisms imaginary time and real time formalisms.
有限温度场论包括虚时和实时两种理论形式。
2
The universal gravitation field is described by imaginary number in the paper. It's energy density is negative real number. And it accord with conservation of energy.
采用虚数场描述万有引力场，其场能密度是负实数，满足能量守恒定律。
3
In the majority of applications either the force field or the displacement field is imaginary.