# Primordial quantum nonequilibrium and large-scale cosmic anomalies

@article{Colin2015PrimordialQN, title={Primordial quantum nonequilibrium and large-scale cosmic anomalies}, author={Samuel Colin and Antony Valentini}, journal={Physical Review D}, year={2015}, volume={92}, pages={043520} }

We study incomplete relaxation to quantum equilibrium at long wavelengths, during a pre-inflationary phase, as a possible explanation for the reported large-scale anomalies in the cosmic microwave background (CMB). Our scenario makes use of the de Broglie-Bohm pilot-wave formulation of quantum theory, in which the Born probability rule has a dynamical origin. The large-scale power deficit could arise from incomplete relaxation for the amplitudes of the primordial perturbations. We show, by…

## 27 Citations

### Robust predictions for the large-scale cosmological power deficit from primordial quantum nonequilibrium

- Physics
- 2015

The de Broglie-Bohm pilot-wave formulation of quantum theory allows the existence of physical states that violate the Born probability rule. Recent work has shown that in pilot-wave field theory on…

### Statistical anisotropy and cosmological quantum relaxation

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We show that cosmological quantum relaxation predicts an anisotropic primordial power spectrum with a specific dependence on wavenumber k. We explore some of the consequences for precision…

### Trans-Planckian fluctuations and the stability of quantum mechanics

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- 2014

We present arguments suggesting that deviations from the Born probability rule could be generated for trans-Planckian field modes during inflation. Such deviations are theoretically possible in the…

### Quantum Effects in Cosmology

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- 2020

Quantum effects play an essential role in modern cosmology. Perhaps the most striking example comes from large-scale structures, generally assumed to originate from vacuum quantum fluctuations and…

### Modeling the large-scale power deficit with smooth and discontinuous primordial spectra

- PhysicsPhysical Review D
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We investigate a set of cosmological models for which the primordial power spectrum has a large-scale power deficit. The standard power-law spectrum is subject to long-wavelength modifications…

### Anisotropic non-gaussianity from rotational symmetry breaking excited initial states

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- 2016

If the initial quantum state of the primordial perturbations broke rotational invariance, that would be seen as a statistical anisotropy in the angular correlations of the cosmic microwave background…

### Anomalous spectral lines and relic quantum nonequilibrium

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We describe features that could be observed in the line spectra of relic cosmological particles should quantum nonequilibrium be preserved in their statistics. According to our arguments, these…

### Quantum gravity and quantum probability

- Physics
- 2021

We argue that in quantum gravity there is no Born rule. The quantumgravity regime, described by a non-normalisable Wheeler-DeWitt wave functional Ψ, must be in quantum nonequilibrium with a…

### The de Broglie–Bohm Quantum Theory and Its Application to Quantum Cosmology

- PhysicsUniverse
- 2021

We review the de Broglie–Bohm quantum theory. It is an alternative description of quantum phenomena in accordance with all the quantum experiments already performed. Essentially, it is a dynamical…

### Gravitation and cosmology with York time

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[Shortened abstract:] In this thesis we investigate a solution to the `problem of time' in canonical quantum gravity by splitting spacetime into surfaces of constant mean curvature parameterised by…

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