What is the QM description of a macroscopic event?

[physika]

Approaches to solving the measurement problem; Bohmian mechanics and the Many-Worlds Interpretation(s).

and Objective Collapse Models..

 

[AlexCaledin]

... Objective Collapse Models.

- why invent models? If the Collapse is truly Objective, then it itself might be causing the whole avalanche of measurements (including our brain events), the quantum state being reduced making (together with the Born rule) all the measurements to describe a consistent physical reality.

(it's like the least action principle which was used without models explaining it)