Axions: From Magnetars and Neutron Star Mergers to Beam Dumps and BECs

Fortin, Jean-François; Guo, Huai-Ke; Harris, Steven P.; Kim, Doojin; Sinha, Kuver; Sun, Chen

doi:10.48550/arxiv.2102.12503

Cited by 4 publications

(4 citation statements)

References 464 publications

(744 reference statements)

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“…For heavier ALP, D s and B pseudo-scalar meson decays provide much softer bounds with c e /f a 10 6 TeV −1 . Present bounds on ALP-electron couplings can be complementary to those obtained from ALP-DM searches [59].…”

Section: Discussionmentioning

confidence: 81%

Leptonic Meson Decays into Invisible ALP

Gallo,

Guerrera,

Peñaranda

et al. 2021

Preprint

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The theoretical calculation of pseudo-scalar leptonic decay widths into an invisible ALP, M → ν a, is reviewed. Assuming generic flavour-conserving ALP couplings to SM fermions and a generic ALP mass, m a , the latest experimental results for pseudo-scalar leptonic decays are used to provide updated bounds on the ALPfermion Lagrangian sector. Constrains on the ALP-quark couplings obtained from these channels are not yet competitive with the ones derived from FCNC processes, like M → P a decays. These leptonic decays can, however, provide the most stringent model-independent upper bounds on ALP-leptons couplings for m a in the (sub)-GeV range.

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Section: Discussionmentioning

confidence: 81%

Leptonic Meson Decays into Invisible ALP

Gallo,

Guerrera,

Peñaranda

et al. 2021

Preprint

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“…One way to search for axion dark matter is by observing its decay into two photons [10][11][12][13][14][15][16][17][18][19]. However, compact objects have long been known to offer a useful avenue in which to probe axions and ALPs in a variety of ways [20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Radio Line Properties of Axion Dark Matter Conversion in Neutron Stars

Battye,

Garbrecht,

McDonald

et al. 2021

Preprint

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Axions are well-motivated candidates for dark matter. Recently, much interest has focused on the detection of photons produced by the resonant conversion of axion dark matter in neutron star magnetospheres. Various groups have begun to obtain radio data to search for the signal, however, more work is needed to obtain a robust theory prediction for the corresponding radio lines. In this work we derive detailed properties for the signal, obtaining both the line shape and time-dependence. The principal physical effects are from refraction in the plasma as well as from gravitation which together lead to substantial lensing which varies over the pulse period. The timedependence from the co-rotation of the plasma with the pulsar distorts the frequencies leading to a Doppler broadened signal whose width varies in time. For our predictions, we trace curvilinear rays to the line of sight using the full set of equations from Hamiltonian optics for a dispersive medium in curved spacetime. Thus, for the first time, we describe the detailed shape of the line signal as well as its time dependence, which is more pronounced compared to earlier results. Our prediction of the features of the signal will be essential for this kind of dark matter search.

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“…The various prospects for axion searches with Advanced LIGO through binary mergers are discussed in detail [31]; see refs. [32,33] for review.…”

Section: Introductionmentioning

confidence: 99%

Field excitation in fuzzy dark matter near a strong gravitational wave source

Dave,

Digal

2021

Preprint

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The axion-like particles with ultralight mass (∼ 10 −22 eV) can be a possibile candidate of dark matter, known as the fuzzy dark matter (FDM). These particles form Bose-Einstein condensate in the early universe which can explain the dark matter density distribution in galaxies at the present time. We study the time evolution of ultralight axion-like field in the near region of a strong gravitational wave (GW) source, such as binary black hole merger. We show that GWs can lead to the generation of field excitations in a spherical shell about the source that eventually propagate out of the shell to minimize the energy density of the field configuration. These excitations are generated towards the end of the merger and in some cases even in the ringdown phase of the merger, therefore it can provide a qualitatively distinct prediction for changes in the GW waveform observed on Earth. This would be helpful in investigating the existence of FDM in galaxies.

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Axions: From Magnetars and Neutron Star Mergers to Beam Dumps and BECs

Cited by 4 publications

References 464 publications

Leptonic Meson Decays into Invisible ALP

Leptonic Meson Decays into Invisible ALP

Radio Line Properties of Axion Dark Matter Conversion in Neutron Stars

Field excitation in fuzzy dark matter near a strong gravitational wave source

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