Inflationary Dynamics and Reheating Mechanisms
Summary
The theory of cosmic inflation describes an early epoch of accelerated expansion driven by a scalar field called the inflaton. During this phase, quantum fluctuations are stretched to macroscopic scales, providing the seeds for the anisotropies observed in the cosmic microwave background and the large-scale structure of the universe. Inflationary dynamics hinge on the slow-roll evolution of the inflaton down a nearly flat potential, ensuring sufficient expansion and nearly scale-invariant perturbations. Once the inflaton reaches the potential minimum, the universe transitions to reheating, the process by which the inflaton’s coherent energy is converted into a thermal bath of particles. Reheating may begin with a non-perturbative preheating stage, characterised by parametric resonance and explosive particle production, and proceeds through perturbative decays that lead to full thermalisation. The details of these stages determine the reheating temperature, influence subsequent processes such as baryogenesis and dark matter genesis, and leave imprints on observables like the spectral index of primordial fluctuations. A comprehensive understanding of inflationary dynamics and reheating mechanisms thus forges a vital link between fundamental particle physics and precision cosmology.
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Inflationary Dynamics and Reheating Mechanisms publication trend
The graph below shows the total number of articles in inflationary dynamics and reheating mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Inflaton: The scalar field responsible for driving the accelerated expansion during cosmic inflation.
Reheating: The phase following inflation in which the inflaton’s energy decays into a hot plasma of standard and possibly non-standard particles.
Preheating: An initial, non-perturbative stage of reheating marked by rapid, resonant particle production from coherent inflaton oscillations.
Spectral index: A parameter (ns) that quantifies the scale dependence of the primordial density perturbation spectrum.
α-attractor models: A class of inflationary scenarios characterised by a universal, plateau-like potential structure controlled by a parameter α.
Squeezed state: A quantum state in which fluctuations in one field variable are reduced at the expense of increased fluctuations in its conjugate variable.
Out-of-time-order correlator (OTOC): A diagnostic of quantum chaos and information scrambling, measuring non-trivial commutators of operators at different times.
References
- Connecting Cosmic Inflation to Particle Physics with LiteBIRD, CMB-S4, EUCLID, and SKA. Physical Review Letters (2024).
- Squeezing, chaos and thermalization in periodically driven quantum systems: the case of bosonic preheating. Journal of High Energy Physics (2024).
- Constraints on the reheating phase after Higgs inflation in the hybrid metric-Palatini approach. Physics Letters B (2024).
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