Future cosmological sensitivity for hot dark matter axions

Archidiacono, Maria; Basse, Tobias; Hamann, Jan; Hannestad, Steen; Raffelt, Georg G.; Wong, Yvonne Y. Y.

doi:10.1088/1475-7516/2015/05/050

Cited by 48 publications

(41 citation statements)

References 117 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The phenomenology of axions and ALPs is determined by their low mass and very weak interactions. ALPs (and other WISPs) could affect stellar evolution [25,26] and cosmology [27] in a similar way to thermal neutrinos. These effects are responsible for the constraint f A 10 7 GeV mentioned above.…”

Section: Introductionmentioning

confidence: 99%

New experimental approaches in the search for axion-like particles

Irastorza

Redondo

2018

Progress in Particle and Nuclear Physics

754

726

View full text Add to dashboard Cite

Axions and other very light axion-like particles appear in many extensions of the Standard Model, and are leading candidates to compose part or all of the missing matter of the Universe. They also appear in models of inflation, dark radiation, or even dark energy, and could solve some long-standing astrophysical anomalies. The physics case of these particles has been considerably developed in recent years, and there are now useful guidelines and powerful motivations to attempt experimental detection. Admittedly, the lack of a positive signal of new physics at the high energy frontier, and in underground detectors searching for weakly interacting massive particles, is also contributing to the increase of interest in axion searches. The experimental landscape is rapidly evolving, with many novel detection concepts and new experimental proposals. An updated account of those initiatives is lacking in the literature. In this review we attempt to provide such an update. We will focus on the new experimental approaches and their complementarity, but will also review the most relevant recent results from the consolidated strategies and the prospects of new generation experiments under consideration in the field. We will also briefly review the latest developments of the theory, cosmology and astrophysics of axions and we will discuss the prospects to probe a large fraction of relevant parameter space in the coming decade.

show abstract

Section: Introductionmentioning

confidence: 99%

New experimental approaches in the search for axion-like particles

Irastorza

Redondo

2018

Progress in Particle and Nuclear Physics

754

726

View full text Add to dashboard Cite

show abstract

“…This regime is probed by measurements of N eff for m φ ≤ T rec and by warm dark matter constraints for m φ > T rec (see e.g. [34,35]), where T rec ≈ 0.26 eV is the temperature at recombination. We will discuss in turn the couplings to gauge bosons ( §2), to fermions ( §3) and to neutrinos ( §4).…”

Section: Introductionmentioning

confidence: 99%

New Target for Cosmic Axion Searches

2016

View full text Add to dashboard Cite

Future cosmic microwave background experiments have the potential to probe the density of relativistic species at the subpercent level. This sensitivity allows light thermal relics to be detected up to arbitrarily high decoupling temperatures. Conversely, the absence of a detection would require extra light species never to have been in equilibrium with the Standard Model. In this paper, we exploit this feature to demonstrate the sensitivity of future cosmological observations to the couplings of axions to all of the Standard Model degrees of freedom. In many cases, the constraints achievable from cosmology will surpass existing bounds from laboratory experiments and astrophysical observations by orders of magnitude.

show abstract

“…with R = 0.553 ± 0.043, the up-to-down quark masses ratio, and f π = 93 MeV, the pion decay constant. Considering other values of R within the range 0.38 − 0.58 [73] does not affect in a significant way this relationship [74].…”

Section: Thermal Axionmentioning

confidence: 85%

Dark radiation and inflationary freedom after Planck 2015

et al. 2016

View full text Add to dashboard Cite

The simplest inflationary models predict a primordial power spectrum (PPS) of the curvature fluctuations that can be described by a power-law function that is nearly scale-invariant. It has been shown, however, that the low-multipole spectrum of the CMB anisotropies may hint the presence of some features in the shape of the scalar PPS, which could deviate from its canonical powerlaw form. We study the possible degeneracies of this non-standard PPS with the active neutrino masses, the effective number of relativistic species and a sterile neutrino or a thermal axion mass. The limits on these additional parameters are less constraining in a model with a non-standard PPS when including only the temperature auto-correlation spectrum measurements in the data analyses. The inclusion of the polarization spectra noticeably helps in reducing the degeneracies, leading to results that typically show no deviation from the ΛCDM model with a standard power-law PPS. These findings are robust against changes in the function describing the non-canonical PPS. Albeit current cosmological measurements seem to prefer the simple power-law PPS description, the statistical significance to rule out other possible parameterizations is still very poor. Future cosmological measurements are crucial to improve the present PPS uncertainties.

show abstract

Future cosmological sensitivity for hot dark matter axions

Cited by 48 publications

References 117 publications

New experimental approaches in the search for axion-like particles

New experimental approaches in the search for axion-like particles

New Target for Cosmic Axion Searches

Dark radiation and inflationary freedom after Planck 2015

Contact Info

Product

Resources

About