Is there a difference between Many Worlds Interpretation and Relational QM?

In summary, the Many Worlds Interpretation (MWI) suggests that the entire universe evolves according to the Schrodinger Equation, with no quantum collapse. However, when a subsystem interacts with another subsystem, it appears as though quantum collapse occurs. On the other hand, Relational Quantum Mechanics (RQM) proposes that every measurement of a system by another system is an interaction between the two, causing quantum collapse. These two interpretations have no connection and are not competing theories. They address different aspects of quantum mechanics and can coexist. The topic was discussed in depth in a forum thread.
  • #1
the_pulp
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Whats the difference between Many Worlds Interpretation and Relational QM. Here is what I understand in few words:

MWI: The whole universe system evolves with Schrodinger Equation without Quantum Collapse, but when a subsystem interacts with other subsystem, it seems like Quantum Collapse.

RQM: Every measurement of a system by another system is like an interaction of the second system over the first one. So it breaks the quantum evolution and so happens quantum collapse.

These ideas seem identical to me. Do you know if there is any diference between these two approaches.

Ps: I am concerned with this two interpretation because I think I am a Many World or a Relational "fan".
 
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  • #2

1. What is the Many Worlds Interpretation (MWI) of quantum mechanics?

The Many Worlds Interpretation is a theory in quantum mechanics that suggests that multiple parallel universes exist, each with its own version of reality. This means that every time a quantum event occurs, the universe splits into multiple branches, with each branch representing a different outcome. This interpretation was proposed by Hugh Everett III in the 1950s.

2. How does the Many Worlds Interpretation differ from other interpretations of quantum mechanics?

The Many Worlds Interpretation differs from other interpretations, such as the Copenhagen Interpretation, in that it suggests that all possible outcomes of a quantum event exist simultaneously in different universes, rather than a single outcome being chosen by an observer. It also eliminates the concept of wavefunction collapse, which is a central aspect of the Copenhagen Interpretation.

3. What is Relational Quantum Mechanics (RQM)?

Relational Quantum Mechanics is a theory that proposes a new way of understanding quantum mechanics by focusing on the relationships between objects rather than the objects themselves. This means that instead of describing objects as isolated entities, RQM takes into account the interactions and relationships between objects and how they affect each other.

4. How does Relational Quantum Mechanics address the measurement problem?

The measurement problem in quantum mechanics refers to the inconsistency between the probabilistic nature of quantum mechanics and the deterministic nature of classical mechanics. RQM addresses this problem by suggesting that the probabilities in quantum mechanics arise from the relationships between objects, rather than being inherent properties of individual objects. This allows for a more consistent and unified understanding of the physical world.

5. Can the Many Worlds Interpretation and Relational Quantum Mechanics be combined?

Some scientists have proposed combining the Many Worlds Interpretation and Relational Quantum Mechanics to create a more complete and coherent theory. This combination suggests that the multiple parallel universes of MWI are interconnected through the relationships between objects in RQM. However, this is still a topic of ongoing debate and research in the scientific community.

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