  We construct and study the simplest universal dissipative Lindblad master
equation for many-body systems with the purpose of a new dissipative extension
of existing nonrelativistic theories of fundamental spontaneous decoherence and
spontaneous wave function collapse in nature. It is universal as it is written
in terms of second-quantized mass density $\hat \rho$ and current $\hat J$,
thus making it independent of the material structure and its parameters.
Assuming linear friction in the current, we find that the dissipative structure
is strictly constrained. Following the general structure of our dissipative
Lindblad equation, we derive and analyze the dissipative extensions of the two
most known spontaneous wave function collapse models, the Di\'osi-Penrose and
the continuous spontaneous localization models.
