WISPy cold dark matter

Arias, Paola; Cadamuro, Davide; Goodsell, Mark D.; Jaeckel, Joerg; Redondo, Javier; Ringwald, Andreas

doi:10.1088/1475-7516/2012/06/013

Cited by 817 publications

(878 citation statements)

References 178 publications

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“…Assuming that the ALP makes up all of the dark matter [10] the photon fluxes found in [1,2] correspond to lifetimes in the range 1 τ ϕ ∼ ð4 × 10 27 -4 × 10 28 Þ s: (2.3) Combining this with the energy of the photon line, we find the following parameters,…”

Section: A Simple Alp Explanationmentioning

confidence: 98%

3.55 keV hint for decaying axionlike particle dark matter

Jaeckel¹,

2014

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Recently, indications for an emission line at 3.55 keV have been found in the combined spectra of a large number of galaxy clusters and also in Andromeda. This line could not be identified with any known spectral line. It is tempting to speculate that it has its origin in the decay of a particle contributing all or part of the dark matter. In this paper we want to point out that axionlike particles being all or part of the dark matter are an ideal candidate to produce such a feature. More importantly the parameter values necessary are quite feasible in extensions of the Standard Model based on string theory and could be linked up to a variety of other intriguing phenomena, which also potentially allow for new tests of this speculation.

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Section: A Simple Alp Explanationmentioning

confidence: 98%

3.55 keV hint for decaying axionlike particle dark matter

Jaeckel¹,

2014

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“…The interest in homogeneous vector fields as cosmological fluids has been growing in the last years, see [58][59][60][61][62][63] for dark energy examples and [64,65] for inflation models based on vector fields. The possibility that a condensate of very light vector particles could play the role of DM was explored in [66] and a wide phenomenological study of this model was made in [67]. Such a condensate could be produced during inflation and its small mass could be generated by the Stückelberg mechanism.…”

Section: Jhep02(2017)064mentioning

confidence: 99%

“…Thus, our perturbative approach does not allow to explore this region. Fortunately, for the masses usually considered [67] this range is out of the cosmologically observable band. Notice for example that assuming for the preferred mass m = 10 −22 eV the limiting wave-number results k 10 −9 Mpc −1 h much smaller than the lowest wave number accessible today k > ∼ 2π/H 0 10 −4 Mpc −1 h, see figure 1.…”

Section: Jhep02(2017)064mentioning

confidence: 99%

Perturbations of ultralight vector field dark matter

Cembranos

Maroto

Jareño

2017

J. High Energ. Phys.

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Abstract:We study the dynamics of cosmological perturbations in models of dark matter based on ultralight coherent vector fields. Very much as for scalar field dark matter, we find two different regimes in the evolution: for modes with k 2 Hma, we have a particle-like behaviour indistinguishable from cold dark matter, whereas for modes with k 2Hma, we get a wave-like behaviour in which the sound speed is non-vanishing and of order c 2 s k 2 /m 2 a 2 . This implies that, also in these models, structure formation could be suppressed on small scales. However, unlike the scalar case, the fact that the background evolution contains a non-vanishing homogeneous vector field implies that, in general, the evolution of the three kinds of perturbations (scalar, vector and tensor) can no longer be decoupled at the linear level. More specifically, in the particle regime, the three types of perturbations are actually decoupled, whereas in the wave regime, the three vector field perturbations generate one scalar-tensor and two vector-tensor perturbations in the metric. Also in the wave regime, we find that a non-vanishing anisotropic stress is present in the perturbed energy-momentum tensor giving rise to a gravitational slip of order (Φ − Ψ)/Φ ∼ c 2 s . Moreover in this regime the amplitude of the tensor to scalar ratio of the scalar-tensor modes is also h/Φ ∼ c 2 s . This implies that small-scale density perturbations are necessarily associated to the presence of gravity waves in this model. We compare their spectrum with the sensitivity of present and future gravity waves detectors.

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“…(4.5) would give a negligible contribution to the dark matter density. Indeed the relics abundance is given by [40],…”

Section: Jhep05(2016)104mentioning

confidence: 99%

Composite accidental axions

Redi

Sato

2016

J. High Energ. Phys.

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Abstract:We present several models where the QCD axion arises accidentally. Confining gauge theories can generate axion candidates whose properties are uniquely determined by the quantum numbers of the new fermions under the Standard Model. The Peccei-Quinn symmetry can emerge accidentally if the gauge theory is chiral. We generalise previous constructions in a unified framework. In some cases these models can be understood as the deconstruction of 5-dimensional gauge theories where the Peccei-Quinn symmetry is protected by locality but more general constructions are possible.

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WISPy cold dark matter

Cited by 817 publications

References 178 publications

3.55 keV hint for decaying axionlike particle dark matter

3.55 keV hint for decaying axionlike particle dark matter

Perturbations of ultralight vector field dark matter

Composite accidental axions

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