Gravity-related wave-function collapse models

Synopsis

The physical origin of quantum wave-function collapse is still a debate topic of quantum theory. Its universality suggests that it should be possible to observe macroscopic objects in a superposition of two indistinguishable positions. However, at the human scale, macroscopic objects obey classical mechanics, and no signature of superposition of states has been observed. This raises the possibility that we should take wave-function collapse as a problem of quantum mechanics and find a way to describe how a collapse occurs before a measurement. Collapse models provide a well phenomenology to answer these questions. In this seminar, I will focus on the Diósi-Penrose collapse model, which attempts to provide a connection of the wave-function collapse to gravity, and I'll talk about one of the last experiments that tried to test this model.