Alleviating the Tension in the Cosmic Microwave Background using Planck-Scale Physics

Abstract

Certain anomalies in the CMB bring out a tension between the six-parameter flat $\Lambda$CDM model and the CMB data. We revisit the PLANCK analysis with loop quantum cosmology (LQC) predictions and show that LQC alleviates both the large-scale power anomaly and the tension in the lensing amplitude. These differences arise because, in LQC, the primordial power spectrum is scale dependent for small $k$, with a specific power suppression. We conclude with a prediction of larger optical depth and power suppression in the $B$-mode polarization power spectrum on large scales.

arXiv comment6 pages, 5 figures, 1 table. The version that appeared in PRL. A few clarifications and several references added

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Cited by in corpus (41)

• A Short Review of Loop Quantum Gravity
• Hybrid Loop Quantum Cosmology: An Overview
• Early dark energy in $k$-essence
• Hubble tension bounds the GUP and EUP parameters
• Hubble tension as a guide for refining the early Universe: Cosmologies with explicit local Lorentz and diffeomorphism violation
• Phenomenological implications of modified loop cosmologies: an overview
• Quantum dynamics of the black hole interior in LQC
• States of Low Energy in bouncing inflationary scenarios in Loop Quantum Cosmology
• A possible common explanation for several cosmic microwave background (CMB) anomalies: A strong impact of nearby galaxies on observed large-scale CMB fluctuations
• Non-oscillating power spectra in Loop Quantum Cosmology
• Hamiltonian formulation and loop quantization of a recent extension of the Kruskal spacetime
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• Probing loop quantum effects through solar system experiments: observational signatures and parameter constraints
• Scalar Cosmological Perturbations from Quantum Entanglement within Lorentzian Quantum Gravity
• The time-dependent mass of cosmological perturbations in loop quantum cosmology: Dapor-Liegener regularization
• Choice of vacuum state and the relation between inflationary and Planck scales
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• Emergent universe revisited through the CSL theory
• Estimation of imprints of the bounce in loop quantum cosmology on the bispectra of cosmic microwave background
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• Quantum isotropy and the reduction of dynamics in Bianchi I
• Computing the graph-changing dynamics of loop quantum gravity
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