Joe Rogan Experience #1352 - Sean Carroll

Wave Functions

Sean Carroll unpacks the enigmatic concept of wave functions in quantum mechanics, emphasizing their role in describing probabilities rather than certainties. He explains that wave functions allow particles like electrons to exist in multiple states simultaneously, a phenomenon known as superposition 1. This is a fundamental aspect of quantum mechanics, where the wave function squared represents the probability of finding a particle in a particular state 2.

The wave function squared is the probabilities.

--- Sean Carroll

Joe Rogan finds this concept perplexing, noting the challenge of understanding quantum mechanics without a physics background 3.

   

Many Worlds

The many worlds interpretation of quantum mechanics suggests that every possible outcome of a quantum event exists in its own separate universe. Sean describes how this interpretation posits that the wave function does not collapse but instead branches into multiple realities 4. This means that there are countless versions of ourselves experiencing different outcomes simultaneously, a concept that challenges our traditional understanding of reality 5.

It's not that your choices create different universes. Different universes get created, and maybe you're different in them by a little bit.

--- Sean Carroll

Joe is fascinated yet bewildered by this idea, questioning how it applies to everyday life 6.

   

Measurement

The measurement problem in quantum mechanics raises questions about the nature of reality and how we perceive it. Sean argues that while physicists can make precise predictions using quantum mechanics, they often avoid addressing the deeper questions of what is truly happening at a fundamental level 7. This reluctance stems from the complexity and counterintuitive nature of quantum phenomena, where the act of measurement itself can alter the state of what is being observed 8.

Physicists understand quantum mechanics in the same way that someone who owns a smartphone understands the smartphone.

--- Sean Carroll

He believes that understanding the true nature of reality should be a central goal of physics, beyond just making predictions 9.