Chaos in a tunneling universe

Article Astronomy & Astrophysics

Tunneling dynamics of an oscillating universe model

Martin Bojowald et al.

Summary: Quasiclassical methods are applied to an oscillating universe model, revealing that the oscillating dynamics is much less regular than in the classical description, even when the parameters do not change.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2022)

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Article Mathematics, Interdisciplinary Applications

Bohmian quantum potential and chaos

A. C. Tzemos et al.

Summary: We study the quantum potential Q in a system of 2 degrees of freedom with a focus on the regions where chaos is generated. We find that Q approaches negative infinity at the nodal points, where the wave function disappears. However, near each nodal point, there is an unstable stagnant point, the X-point, which scatters the incoming trajectories and leads to chaos. We analyze the quantum potential of wavefunctions with a single nodal point, infinitely many nodal points along a straight line, and a finite number of scattered nodal points in the configuration space. In all cases, we observe that the X-points are closely associated with the local maxima of Q, which form spikes when the nodal points acquire large velocities in the inertial frame of reference (x, y).

CHAOS SOLITONS & FRACTALS (2022)

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Article Astronomy & Astrophysics

Quantum Higgs inflation

Martin Bojowald et al.

Summary: The Higgs field is a potential candidate for the inflaton due to its observational confirmation as a fundamental scalar field, but using the classical Higgs potential in inflation models has been ruled out. A new approach using non-adiabatic quantum dynamics in cosmological models leads to a multi-field Higgs-like potential, consistent with observations and avoiding non-standard ingredients. By applying uncertainty relations to estimate quantum fluctuations in the early universe, novel effects are introduced at the beginning of inflation, addressing common fine-tuning issues.

PHYSICS LETTERS B (2021)

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Article Astronomy & Astrophysics

Multi-field inflation from single-field models

Martin Bojowald et al.

Summary: This passage discusses the concept of quantization and its systematic derivation in a cosmological application. It explains how a multi-field model can make single-field Higgs inflation observationally viable, and the role of non-adiabatic methods in setting suitable initial conditions and ending inflation after a preferred number of e-folds. It also highlights how new parameters in the interaction potential are derived from background states, showing the impact of background non-Gaussianity on observational features of inflation.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

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Article Physics, Multidisciplinary