Quantum Damping of Cosmological Shear: A New Prediction from Loop Quantum Cosmologies

Wen-Cong Gan; Leila L. Graef; Rudnei O. Ramos; Gustavo S. Vicente; Anzhong Wang

doi:10.1103/f8tr-bq61

Quantum Damping of Cosmological Shear: A New Prediction from Loop Quantum Cosmologies

Wen-Cong Gan ^1,*, Leila L. Graef ^2,†, Rudnei O. Ramos ^3,‡, Gustavo S. Vicente ^4,§, and Anzhong Wang ^5,∥

¹School of Physics, Jiangxi Normal University, Nanchang, 330022, China
²Instituto de Física, Universidade Federal Fluminense, 24210-346 Niteroi, RJ, Brazil
³Departamento de Física Teórica, Universidade do Estado do Rio de Janeiro, 20550-013 Rio de Janeiro, RJ, Brazil
⁴Faculdade de Tecnologia, Universidade do Estado do Rio de Janeiro, 27537-000 Resende, RJ, Brazil
⁵GCAP-CASPER, Department of Physics and Astronomy, Baylor University, Waco, Texas 76798-7316, USA

^*Contact author: ganwencong@jxnu.edu.cn
^†Contact author: leilagraef@id.uff.br
^‡Contact author: rudnei@uerj.br
^§Contact author: gustavo@fat.uerj.br
^∥Contact author: Anzhong_Wang@baylor.edu

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Phys. Rev. Lett. 136, 251501 – Published 23 June, 2026

DOI: https://doi.org/10.1103/f8tr-bq61

Abstract

We study the dynamics of the Bianchi I universe in modified loop quantum cosmology (mLQC-I) and uncover a robust mechanism for isotropization: the shear is dynamically suppressed after the bounce and decays rapidly in the quantum postbounce regime, independently of the equation of state of standard matter sources. This naturally drives the Universe toward a homogeneous and isotropic expanding phase without fine-tuning. Our results show that mLQC-I provides a new quantum-gravitational mechanism for suppressing anisotropies, absent in other bounce models.

Physical Review Letters

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Quantum Damping of Cosmological Shear: A New Prediction from Loop Quantum Cosmologies

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Quantum Damping of Cosmological Shear: A New Prediction from Loop Quantum Cosmologies

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