2015/07/16 by Ivan Agullo, Iván Agulló · 5 citations
Physics and Astronomy · #Astrophysics #Asymmetry #Big Bang (financial markets) #Big Bounce #Black Holes and Theoretical Physics #Cosmic background radiation #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Inflation (cosmology) #Initial singularity #Loop quantum cosmology #Non-Gaussianity #Noncommutative and Quantum Gravity Theories #Observable #Physics #Primordial fluctuations #Quantum #Quantum cosmology #Quantum electrodynamics #Quantum gravity #Quantum mechanics #Spectral density #Universe #astro-ph.CO #gr-qc
paper · pdf · doi:10.1103/physrevd.92.064038
published as Phys. Rev. D 92, 064038 (2015) · 7 pages, 3 figure
arxiv created 2015/07/16 · openalex publication_date 2015/09/22 · arxiv updated 2015/09/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We argue that the anomalous power asymmetry observed in the cosmic microwave background (CMB) may have originated in a cosmic bounce preceding inflation. In loop quantum cosmology (LQC), the big bang singularity is generically replaced by a bounce due to quantum gravitational effects. We compute the spectrum of inflationary non-Gaussianity and show that strong correlation between observable scales and modes with longer (superhorizon) wavelength arise as a consequence of the evolution of perturbations across the LQC bounce. These correlations are strongly scale dependent and induce a dipole-dominated modulation on large angular scales in the CMB, in agreement with observations.