A signature of quantum gravity at the source of the seeds of cosmic structure?
Daniel Sudarsky

TL;DR
This paper critiques standard inflationary models for cosmic structure origin, proposing a quantum gravity-inspired wave function collapse mechanism to better explain the emergence of inhomogeneity and anisotropy.
Contribution
It introduces a novel approach based on Penrose's ideas, addressing the symmetry-breaking issue in the quantum origin of cosmic structures.
Findings
Highlights shortcomings of standard models
Proposes a quantum gravity-induced collapse mechanism
Suggests a new pathway for understanding cosmic inhomogeneities
Abstract
This article reviews a recent work by a couple of colleagues and myself about the shortcomings of the standard explanations of the quantum origin of cosmic structure in the inflationary scenario, and a proposal to address them. The point it that in the usual accounts the inhomogeneity and anisotropy of our universe seem to emerge from an exactly homogeneous and isotropic initial state through processes that do not break those symmetries. We argued that some novel aspect of physics must be called upon to able to address the problem in a fully satisfactory way. The proposed approach is inspired on Penrose's ideas regarding an quantum gravity induced, real and dynamical collapse of the wave function.
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