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Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn
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Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn
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Upcoming measurements of the 21-cm line of neutral hydrogen will open a new observational window into the early stages of structure growth, providing a unique opportunity for probing large-scale cosmological signatures using the small-scale signals from the first stars. In this paper we evaluate the detection significance of compensated isocurvature perturbations (CIPs) from observations of the 21-cm hydrogen-line during the cosmic-dawn era. CIPs are modulations of the relative baryon and dark-matter density that leave the total matter density unchanged. We find that, under different assumptions for feedback and foregrounds, the ongoing HERA and upcoming SKA1-low experiments will provide constraints on uncorrelated CIPs at the level of $\sigma(A_{\rm CIP})= 10^{-3}-10^{-4}$, comparable to the sensitivity of upcoming CMB experiments, and potentially exceeding the constraints from cosmic-variance limited BAO surveys.
Forward citations
Cited by 3 Pith papers
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The Rise and Fall of Acoustic Oscillations at Cosmic Dawn
Ignoring the percent-level phase offset between BAO and VAO features in the cosmic-dawn 21-cm power spectrum biases H(z) by ~2%; joint BAO–VAO templates are required for standard-ruler inference.
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Reviving the Affleck-Dine Curvaton Scenario with Compensated Isocurvature Perturbations
The Affleck-Dine field can act as both baryogenesis engine and curvaton if gravitino dark matter, produced before curvaton decay, supplies the compensating isocurvature perturbation that hides the baryon isocurvature ...
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Tracing the Neutrino-Induced Phase Shift in the 21-cm Spectrum
The neutrino-induced phase shift in the 21-cm power spectrum is a redshift- and scale-dependent weighted average of two distinct templates: the known BAO phase shift and a newly computed, larger VAO phase shift.
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