The COSmic Monopole Observer (COSMO)

Masi, S.; Battistelli, E. S.; Bernardis, P. de; Coppolecchia, A.; Columbro, F.; D’Alessandro, G.; Petris, M. De; Lamagna, L.; Marchitelli, E.; Mele, L.; Paiella, A.; Pisano, G.; Bersanelli, M.; Franceschet, C.; Manzan, E.; Mennella, D.; Realini, S.; Cibella, Sara; Martini, F. De; Pettinari, G.; Coppi, Gabriele; Gervasi, M.; Limonta, A.; Zannoni, M.; Piccirillo, L.; Tucker, C.

doi:10.48550/arxiv.2110.12254

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…A 3 mbar residual atmosphere at 40 km altitude will still create a large photon noise contribution with respect to the extremely faint signal that we are trying to observe. For instance, atmospheric effects at ground level and even at balloon altitudes are shown in Masi et al 17 with respect to spectral distortion signals. The signal level due to the atmosphere is 2 to 3 orders of magnitude higher that the non-relativistic y-distortion signal depending on the frequency.…”

Section: Residual Atmospherementioning

confidence: 99%

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BISOU: a balloon project for spectral observations of the early universe

Maffei

Aghanim

Aumont³

et al. 2022

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI

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The BISOU (Balloon Interferometer for Spectral Observations of the Universe) project studies the viability and prospects of a balloon-borne spectrometer, pathfinder of a future space mission dedicated to the measurements of the CMB spectral distortions, while consolidating the instrumental concept and improving the readiness of some of its key sub-systems. A balloon concept based on a Fourier Transform Spectrometer, covering a spectral range from about 90 GHz to 2 THz, adapted from previous mission proposals such as PIXIE and FOSSIL, is being studied and modelled. Taking into account the requirements and conditions of balloon flights (i.e. residual atmosphere, observation strategy for instance), we present here the instrument concept together with the results

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Section: Residual Atmospherementioning

confidence: 99%

“…This cannot be modelled and will therefore need a way to modulate/monitor the atmosphere at a high enough frequency to be compatible with the variation timescale. Such a modulator is already used for COSMO 17 . However this would be too big and heavy for BISOU.…”

Section: Residual Atmospherementioning

confidence: 99%

BISOU: a balloon project for spectral observations of the early universe

Maffei

Aghanim

Aumont³

et al. 2022

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI

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The role of soft photon injection and heating in 21 cm cosmology

Acharya

Cyr

Chluba

2023

Monthly Notices of the Royal Astronomical Society

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The ARCADE radio excess and EDGES measurement remain puzzling. A link between the two has been previously considered, however, in this work we highlight an important related effect that was not analyzed in detail before. By performing cosmological thermalization calculations with soft photon injection using CosmoTherm, we show that for the 21 cm signal generation the interplay between enhanced radio spectral distortions and the associated heating can hide a significant radio excess before the reionzation era. We illustrate this effect for a simple power-law soft photon source in decaying particle scenarios. Even if simplistic, the uncovered link between CMB spectral distortions and 21 cm cosmology should apply to a much broader range of scenarios. This could significantly affect the constraints derived from existing and future 21 cm observations on the evolution of the ambient radio background. In particular, scenarios that would be ruled out by existing data without heating could become viable solutions once the heating is accounted for in the modelling. Our calculations furthermore highlight the importance of global 21 cm observations reaching into the dark ages, where various scenarios can potentially be distinguished.

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Revisiting dark photon constraints from CMB spectral distortions

Chluba,

Cyr,

Johnson

2024

Monthly Notices of the Royal Astronomical Society

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Spectral distortions of the cosmic microwave background (CMB) provide stringent constraints on energy and entropy production in the post-BBN (Big Bang Nucleosynthesis) era. This has been used to constrain dark photon models with COBE/FIRAS and forecast the potential gains with future CMB spectrometers. Here, we revisit these constraints by carefully considering the photon to dark photon conversion process and evolution of the distortion signal. Previous works only included the effect of CMB energy density changes but neglected the change to the photon number density. We clearly define the dark photon distortion signal and show that in contrast to previous analytic estimates the distortion has an opposite sign and a ≃ 1.5 times larger amplitude. We furthermore extend the treatment into the large distortion regime to also cover the redshift range ≃ 2 × 106 − 4 × 107 between the μ-era and the end of BBN using CosmoTherm. This shows that the CMB distortion constraints for dark photon masses in the range 10−4 eV ≲ md ≲ 10−3 eV were significantly underestimated. We demonstrate that in the small distortion regime the distortion caused by photon to dark photon conversion is extremely close to a μ-type distortion independent of the conversion redshift. This opens the possibility to study dark photon models using CMB distortion anisotropies and the correlations with CMB temperature anisotropies as we highlight here.

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The COSmic Monopole Observer (COSMO)

Cited by 3 publications

References 23 publications

BISOU: a balloon project for spectral observations of the early universe

BISOU: a balloon project for spectral observations of the early universe

The role of soft photon injection and heating in 21 cm cosmology

Revisiting dark photon constraints from CMB spectral distortions

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