Probing primordial non-Gaussianity with 21 cm fluctuations from minihalos

Abstract

We investigate future constraints on primordial local-type non-Gaussianity from 21 cm angular power spectrum from minihalos. We particularly focus on the trispectrum of primordial curvature perturbations which are characterized by the non-linearity parameters ${\tau }_{\mathrm{NL}}$ and $g_{\mathrm{NL}}$. We show that future measurements of minihalo 21 cm angular power spectrum can probe these non-linearity parameters with an unprecedented precision of ${\tau }_{\mathrm{NL}}\sim 30$ and $g_{\mathrm{NL}}\sim 2\times 10^3$ for Square Kilometre Array (SKA) and ${\tau }_{\mathrm{NL}}\sim 0.6$ and $g_{\mathrm{NL}}\sim 8\times 10^2$ for Fast Fourier Transform Telescope (FFTT). These levels of sensitivity would give significant implications for models of the inflationary Universe and the origin of cosmic density fluctuations.

6 pages, 2 figures, 4 tables

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• Measuring the Inflaton Coupling in the CMB
• Primordial trispectrum from kSZ tomography
• LiteBIRD and CMB-S4 Sensitivities to Reheating in Plateau Models of Inflation
• The 21-cm signals from ultracompact minihalos as a probe of primordial small-scale fluctuations
• Physics Beyond The Standard Model with Circular Polarization in the CMB and CMB-21cm Cross-Correlation
• Cosmology from the kinetic polarized Sunyaev Zel'dovich effect
• Extracting the Signal of Cosmic String Wakes from 21-cm Observations
• Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization
• Probing axion dark matter with 21cm fluctuations from minihalos
• Nonminimally Assisted Inflation: A General Analysis
• Double inflation via non-minimally coupled spectator
• Probing the Inflaton Potential with SKA