On the wondrous stability of ALP dark matter

Alonso-Álvarez, Gonzalo; Gupta, Rick S.; Jaeckel, Joerg; Spannowsky, Michael

doi:10.1088/1475-7516/2020/03/052

Cited by 48 publications

(57 citation statements)

References 78 publications

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“…Axion-like particles (ALPs, see e.g. [3,4]), which are hypothetical light particles predicted by the superstring and superbrane theories [5][6][7][8][9][10][11][12][13][14] and nowadays the best candidates to constitute the dark matter [15][16][17][18][19], have been invoked to solve several issues. ALPs are a generalization of the axion, which is the pseudo-Goldsone boson arising from the breakdown of the global Peccei-Quinn symmetry U PC (1), which was proposed in order to solve the strong CP problem [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

ALP induced polarization effects on photons from galaxy clusters

Galanti¹,

Roncadelli²,

Tavecchio³

2022

Preprint

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Many extensions of the Standard Model of particle physics such as superstring and superbrane theories predict the existence of axion-like particles (ALPs). ALPs are very elusive particles, which primarily interact with photons and in the presence of an external magnetic field two effects are produced: (i) photon-ALP oscillations, (ii) change of the polarization state of photons. The astrophysical context represents the best possibility to obtain indirect evidence for the ALP existence thanks to the various effects that photon-ALP interaction produces. Great attention has been paid so far to the former effect: photon-ALP interaction modifies the transparency of the crossed media and final spectra are altered presenting either a flux excess or irregularities or both these features. Two hints at ALP existence have also been discovered. However, less interest has been attracted by the latter main ALP effect: the modification of photon polarization. In this paper we want to address it both in the X-ray and in the high-energy (HE) bands. In particular, we analyze the photon degree of linear polarization and the polarization angle when photon-ALP interaction is present concerning photons generated in the central region of galaxy clusters: we study Perseus and Coma. We observe that photon-ALP interaction substantially changes the photon polarization expected from standard physics and that it shows interesting features both in the X-ray and in the HE band. We conclude that the ALP-induced polarization effects are more likely detectable from the proposed missions like COSI, e-ASTROGAM and AMEGO in the HE range.

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Section: Introductionmentioning

confidence: 99%

ALP induced polarization effects on photons from galaxy clusters

Galanti¹,

Roncadelli²,

Tavecchio³

2022

Preprint

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“…Although the spontaneous decay time of ALPs is tremendously larger than the age of the universe, the decay time obtained in [23] from the classical equation of motion is just about ∼ 10 −7 s, which is dramatically small comparing to the first value. Theoretically, ALPs are expected to be created in the very early universe era, and according to this scenario they have an extremely short lifetime and they supposed to decay so rapidly.…”

Section: Stimulated Decay Of Alpsmentioning

confidence: 84%

“…To be more specific, the plasma generates an effective mass for the photons and modifies the dispersion relation of photons. Taking this effect into account would lead to several impacts on the current status of ALPs decay [24]. Therefore we need to resolve the classical equation of motion for photon propagation in an ALP background with the consideration of the plasma effects.…”

Section: Stimulated Decay Of Alpsmentioning

confidence: 99%

Potential of SKA to Detect CDM ALPs with Radio Astronomy

Ayad¹,

Beck²

2020

Proceedings of the International Conference on Neutrinos and Dark Matter (NDM-2020)

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Axions and Axion-like particles (ALPs) are light pseudo-scalar particles predicted in many theoretically well-motivated extensions to the standard model of particle physics (SM). The search for cold dark matter (CDM) ALPs has gained tremendous ground over the last few years. Essentially, ALPs are characterized by their coupling with two photons which allows axions to decay into pairs of photons. In this work, we explore the potential of the Square Kilometer Array (SKA) to detect CDM ALPs with radio astronomy in an attempt to detect an observational signature of ALPs conversion onto photons in astrophysical field.

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“…s → a's since there could be a Bose-enhancement effect [39,40,[69][70][71][72][73][74][75][76][77][78][79][80][81]. The resonance q-parameter [74] for the s-a system soon after the PT is evaluated as…”

Section: A R K S E C T O R T H E R M a L I Z E D O R I N V A L I D E S T I M A T I O Nmentioning

confidence: 99%

Hidden photon and axion dark matter from symmetry breaking

Nakayama

Yin

2021

J. High Energ. Phys.

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A light hidden photon or axion-like particle is a good dark matter candidate and they are often associated with the spontaneous breaking of dark global or gauged U(1) symmetry. We consider the dark Higgs dynamics around the phase transition in detail taking account of the portal coupling between the dark Higgs and the Standard Model Higgs as well as various thermal effects. We show that the (would-be) Nambu-Goldstone bosons are efficiently produced via a parametric resonance with the resonance parameter q ∼ 1 at the hidden symmetry breaking. In the simplest setup, which predicts a second order phase transition, this can explain the dark matter abundance for the axion or hidden photon as light as sub eV. Even lighter mass, as predicted by the QCD axion model, can be consistent with dark matter abundance in the case of first order phase transition, in which case the gravitational wave signals may be detectable by future experiments such as LISA and DECIGO.

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On the wondrous stability of ALP dark matter

Cited by 48 publications

References 78 publications

ALP induced polarization effects on photons from galaxy clusters

ALP induced polarization effects on photons from galaxy clusters

Potential of SKA to Detect CDM ALPs with Radio Astronomy

Hidden photon and axion dark matter from symmetry breaking

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