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The Observer Paradigm in Semiclassical Gravity: A Postmodern Perspective

Sean McBride

Abstract

Recent advances in semiclassical gravity, both in our understanding of the gravitational path integral and the algebraic structure of a gravitating subregion, rely on the presence of an observer to obtain a nontrivial Hilbert space for closed universe backgrounds. Here I examine this proposal from a postmodern lens, identifying attempts to define ``observer rules'' as manifestations of metanarrative breakdown: the observer both supplies and undermines the perturbative gravitational Hilbert space. Rather than resolving this tension, I advocate for a post-postmodern acceptance of the incompatibility between observer-dependent and observer-free descriptions of closed universes, treating the ambiguity as a feature of quantum gravity's fundamental degrees of freedom. To my knowledge, this is the first reference to post-postmodernism in concert with physics.

The Observer Paradigm in Semiclassical Gravity: A Postmodern Perspective

Abstract

Recent advances in semiclassical gravity, both in our understanding of the gravitational path integral and the algebraic structure of a gravitating subregion, rely on the presence of an observer to obtain a nontrivial Hilbert space for closed universe backgrounds. Here I examine this proposal from a postmodern lens, identifying attempts to define ``observer rules'' as manifestations of metanarrative breakdown: the observer both supplies and undermines the perturbative gravitational Hilbert space. Rather than resolving this tension, I advocate for a post-postmodern acceptance of the incompatibility between observer-dependent and observer-free descriptions of closed universes, treating the ambiguity as a feature of quantum gravity's fundamental degrees of freedom. To my knowledge, this is the first reference to post-postmodernism in concert with physics.

Paper Structure

This paper contains 5 sections, 2 equations, 1 figure.

Table of Contents

  1. A Postmodern Primer
  2. Postmodern Physics
  3. The Observer Paradigm
  4. The Observer-Narrator
  5. A Post-Postmodern Physics?

Figures (1)

  • Figure 1: The two fundamental Hilbert spaces that result from the inclusion or exclusion of an observer. The Hilbert space in the observer-laden closed universe is an approximate description capped off by the observer's intrinsic entropy. The Hilbert space of the observer-free closed universe is nonperturbatively trivial.