You’re thinking according what pragmatist calls the “old version” of MWI. In the modern understanding, it’s not that an universe splits into several when a quantum measurement is performed—more like the ‘universes’ were ‘there’ all along but the differences between them used to be in degrees of freedom you don’t care about (such as the thermal noise in the measurement apparatus).
You’re thinking according what pragmatist calls the “old version” of MWI. In the modern understanding, it’s not that an universe splits into several when a quantum measurement is performed—more like the ‘universes’ were ‘there’ all along but the differences between them used to be in degrees of freedom you don’t care about (such as the thermal noise in the measurement apparatus).