Mimicking two field inflationary features with a single field
arXiv:2310.17619 · doi:10.1016/j.dark.2023.101343
Abstract
It is well known that damped superimposed oscillations at large scales in the primordial power spectrum can be generated in both single field and two field models. In single field inflationary models, these features typically arise due to deviations from the slow roll regime. On the other hand, in two field models, these features are generated due to a turn in the background trajectory in the field space. In this work, we demonstrate that both single field and two field models can produce identical features at large scales in the primordial power spectrum. To achieve this, we utilize the generalized slow roll approximation and successfully reconstruct single field models based on the featured power spectrum typically generated in two field models. To validate our methodology, we numerically calculate the power spectrum from the reconstructed potential and find a remarkable agreement with the power spectrum which is obtained from the two field model.
arXiv comment11 pages, 2 figures
References in corpus (31)
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
- Planck 2018 results. X. Constraints on inflation
- Primordial black holes from single field models of inflation
- Massive Primordial Black Holes from Hybrid Inflation as Dark Matter and the seeds of Galaxies
- Features of heavy physics in the CMB power spectrum
- Inflationary perturbations from a potential with a step
- Metric perturbations in two-field inflation
- Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
- Perturbations in generalized multi-field inflation
- Curvature and isocurvature perturbations in two-field inflation
- Generating PBHs and small-scale GWs in two-field models of inflation
- Seeding primordial black holes in multifield inflation
- Inflation and WMAP three year data: Features have a Future!
- PBHs and secondary GWs from ultra slow roll and punctuated inflation
- On the importance of heavy fields during inflation
- The Spectrum of Density Perturbations produced during Inflation to Leading Order in a General Slow-Roll Approximation
- Primordial features due to a step in the inflaton potential
- Influence of heavy modes on perturbations in multiple field inflation
- Second Order General Slow-Roll Power Spectrum
- Generalized Slow Roll for Large Power Spectrum Features
- Inflationary Steps in the Planck Data
- Searching for Standard Clocks in the Primordial Universe
- Generating primordial features at large scales in two field models of inflation
- Observational imprints of enhanced scalar power on small scales in ultra slow roll inflation and associated non-Gaussianities
- Enhanced power on small scales and evolution of quantum state of perturbations in single and two field inflationary models
- From the Spectrum to Inflation : An Inverse Formula for the General Slow-Roll Spectrum
- Reconstruction of potentials of the hybrid inflation in the light of primordial black hole formation
- Distinguishing cosmological models through quantum signatures of primordial perturbations
- From the Spectrum to Inflation: A Second Order Inverse Formula for the General Slow-Roll Spectrum
- Potential reconstruction from general power spectrum in single-field inflation