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Can we "effectivize" spacetime?

Lu Chen1

  • 1Koc University, Department of Philosophy, SOS 156, Istanbul 34450, Turkey.

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|August 19, 2022
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Summary
This summary is machine-generated.

Effective realism suggests scientific theories offer limited knowledge of the unobservable. This paper challenges effective quantum gravity (EQG) and effective field theories (EFTs), arguing they do not provide realistic spacetime theories.

Keywords:
Effective field theoryEffective quantum gravityEffective realismRenormalizationScientific realismSpacetime

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Area of Science:

  • Physics
  • Philosophy of Science

Background:

  • Effective realism posits that scientific theories provide knowledge of the unobservable world, but not at a fundamental level.
  • The effective field-theory (EFT) approach in high-energy physics supports this, suggesting theories have limited applicability.
  • EFTs are expected to break down beyond a certain energy scale.

Purpose of the Study:

  • To present new challenges to effective realism and the EFT approach.
  • To argue that effective quantum gravity (EQG) does not yield a realistic theory of spacetime.
  • To highlight an interpretative dilemma concerning EFTs' reliance on classical spacetime.

Main Methods:

  • Philosophical analysis of effective realism.
  • Examination of the conceptual underpinnings of effective field theories (EFTs).
  • Critique of effective quantum gravity (EQG) as a realistic theory.

Main Results:

  • Effective quantum gravity (EQG) fails to provide a realistic theory of spacetime, even within its domain of validity.
  • All EFTs face an interpretative challenge regarding their use of classical spacetime beyond their scope.
  • The fundamental limitations of EFTs challenge the scope of knowledge they provide about reality.

Conclusions:

  • Effective realism and the EFT approach face significant challenges.
  • EQG does not offer a realistic depiction of spacetime.
  • A general interpretative issue exists for all EFTs concerning their relationship with classical spacetime.