For genuine 3D collapsing Bianchi I initial conditions in mLQC-I, quantum effects damp shear exponentially after the bounce, yielding an isotropic attractor independent of matter content under the weak energy condition.
Cancellation of one-parameter graviton gauge dependence in the effective scalar field equation in de Sitter
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abstract
We investigate gauge dependence of one-graviton-loop corrections to the effective field equation of the massless, minimally coupled scalar in de Sitter, obtained by including source and observer corrections to the effective self-mass correcting the equation. Using the $\Delta\alpha$ variation of the de Sitter-breaking graviton propagator in a one-parameter family of gauges, we compute the gauge-dependent contributions to the effective self-mass of a massless minimally coupled scalar mediating interactions between heavy scalars. We show that gauge dependence cancels provided the contributions from all diagram classes are collected, including one-loop corrections to external mode functions, which play a qualitatively new role relative to flat space. The resulting cancellation supports the construction of graviton gauge-independent cosmological quantum-gravitational observables from quantum-corrected effective equations.
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gr-qc 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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Genericness of quantum damping of cosmological shear in modified loop quantum cosmology
For genuine 3D collapsing Bianchi I initial conditions in mLQC-I, quantum effects damp shear exponentially after the bounce, yielding an isotropic attractor independent of matter content under the weak energy condition.