TL;DR
This paper proposes that a relational approach to quantum mechanics offers a coherent framework for addressing conceptual issues in quantum cosmology, such as the role of observers and the absence of a global time variable.
Contribution
It introduces a relational formulation of quantum mechanics as a solution to conceptual problems in quantum cosmology.
Findings
Relational quantum mechanics clarifies the role of observers in cosmology.
The relational approach resolves the problem of time in the Wheeler-DeWitt equation.
Evolution in quantum cosmology is inherently relational, not absolute.
Abstract
The application of quantum theory to cosmology raises a number of conceptual questions, such as the role of the quantum-mechanical notion of "observer" or the absence of a time variable in the Wheeler-DeWitt equation. I point out that a relational formulation of quantum mechanics, and more in general the observation that evolution is always relational, provides a coherent solution to this tangle of problems.
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