Physical Cosmology from the 21 cm Line

Furlanetto, Steven R.

doi:10.1088/2514-3433/ab4a73ch3

Cited by 3 publications

(3 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ref. [8], which provides a general review of 21cm cosmology). We will later briefly discuss a claim of detection of primordial 21cm radiation by the EDGES experiment, which if confirmed could suggest an even lower gas temperature.…”

Section: Simple Estimates For Dark Matter Annihilation Over the Histo...mentioning

confidence: 99%

“…If the radiation temperature exceeds the spin temperature, there will be net absorption; in the opposite case, net emission. More generally, the 21cm brightness temperature (governing the intensity of the line) is proportional to 1 − T R /T s , as well as to the fraction of hydrogen that is ionized [8]. EDGES's detection of a deep absorption trough thus suggested T s < T R at z ∼ 15 − 20, and set an upper limit on T s /T R (z = 17.2) < 0.105 at 99% confidence.…”

Section: CM Absorptionmentioning

confidence: 99%

See 1 more Smart Citation

Les Houches Lectures on Indirect Detection of Dark Matter

Slatyer

2021

Preprint

View full text Add to dashboard Cite

These lectures, presented at the 2021 Les Houches Summer School on Dark Matter, provide an introduction to key methods and tools of indirect dark matter searches, as well as a status report on the field circa summer 2021. Topics covered include the possible effects of energy injection from dark matter on the early universe, methods to calculate both the expected energy distribution and spatial distribution of particles produced by dark matter interactions, an outline of theoretical models that predict diverse signals in indirect detection, and a discussion of current constraints and some claimed anomalies. These notes are intended as an introduction to indirect dark matter searches for graduate students, focusing primarily on intuition-building estimates and useful concepts and tools.

show abstract

Section: Simple Estimates For Dark Matter Annihilation Over the Histo...mentioning

confidence: 99%

Section: CM Absorptionmentioning

confidence: 99%

Les Houches Lectures on Indirect Detection of Dark Matter

Slatyer

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Fig. 1 in [32] for a demonstration of models invoking extra cooling). New exotic physics have been proposed to explain the gap between the EDGES detection and standard cosmology.…”

Section: Discussionmentioning

confidence: 99%

Reaching small scales with low-frequency imaging: applications to the Dark Ages

Morabito

Silk

2020

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

The initial conditions for the density perturbations in the early Universe, which dictate the large-scale structure and distribution of galaxies we see today, are set during inflation. Measurements of primordial non-Gaussianity are crucial for distinguishing between different inflationary models. Current measurements of the matter power spectrum from the cosmic microwave background only constrain this on scales up to k ∼ 0.1 Mpc −1 . Reaching smaller angular scales (higher values of k ) can provide new constraints on non-Gaussianity. A powerful way to do this is by measuring the HI matter power spectrum at z ≳ 30 . In this paper, we investigate what values of k can be reached for the Low-Frequency Array (LOFAR), which can achieve ≲ 1″ resolution at approximately 50 MHz. Combining this with a technique to isolate the spectrally smooth foregrounds to a wedge in k ∥ – k ⊥ space, we demonstrate what values of k we can feasibly reach within observational constraints. We find that LOFAR is approximately five orders of magnitude away from the desired sensitivity, for 10 years of integration time. This article is part of a discussion meeting issue ‘Astronomy from the Moon: the next decades’.

show abstract

Dark ages, a window on the dark sector. Hunting for ultra-light axions

Vanzan,

Raccanelli,

Bartolo

2024

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Measurements of 21 cm intensity mapping (IM) during the dark ages can potentially provide us with an unprecedented window on high redshifts and small scales. One of the main advantages this can bring involves the possibility to probe the nature of dark matter. Tests of dark matter models with the large-scale structure of the Universe are limited by non-linearities and astrophysical effects, which are not present for IM measurements during the dark ages. In this paper we focus on constraining the model in which dark matter is comprised, totally or in part, by ultra-light axion-like particles around the 10-18– 10-22 eV mass scale. For this model, the angular power spectrum of 21 cm brightness temperature fluctuations will exhibit a small-scale suppression. However, this effect is intertwined with the imprint of baryon-dark matter relative velocity at recombination, causing at the same time an enhancement at large-scales, which is affected by the mass and abundance of axion dark matter. In this work we forecast how future radio arrays will be able to constrain ultra-light axion mass through both these effects on the angular power spectrum.

show abstract

Physical Cosmology from the 21 cm Line

Cited by 3 publications

References 65 publications

Les Houches Lectures on Indirect Detection of Dark Matter

Les Houches Lectures on Indirect Detection of Dark Matter

Reaching small scales with low-frequency imaging: applications to the Dark Ages

Dark ages, a window on the dark sector. Hunting for ultra-light axions

Contact Info

Product

Resources

About