Astrophysical Axion Bounds

Raffelt, Georg G.

doi:10.1007/978-3-540-73518-2_3

Cited by 552 publications

(728 citation statements)

References 113 publications

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“…The ALP coupling to photons is the primary parameter through which cosmological and astrophysical bounds are set on these objects [34]. In particular, Helioscope experiments such as CAST constrain this coupling up to a certain ALP mass by trying to convert ALPs that may have been produced by the sun into photons via the Primakoff process.…”

Section: Testing the Coupling To Photonsmentioning

confidence: 99%

ALPs at colliders

Mimasu

Sanz

2015

J. High Energ. Phys.

191

205

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New pseudo-scalars, often called axion-like particles (ALPs), abound in modelbuilding and are often associated with the breaking of a new symmetry. Traditional searches and indirect bounds are limited to light axions, typically in or below the KeV range for ALPs coupled to photons. We present collider bounds on ALPs from mono-γ, tri-γ and mono-jet searches in a model independent fashion, as well as the prospects for the LHC and future machines. We find that they are complementary to existing searches, as they are sensitive to heavier ALPs and have the capability to cover an otherwise inaccessible region of parameter space. We also show that, assuming certain model dependent correlations between the ALP coupling to photons and gluons as well as considering the validity of the effective description of ALP interactions, mono-jet searches are in fact more suitable and effective in indirectly constraining ALP scenarios.

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Section: Testing the Coupling To Photonsmentioning

confidence: 99%

ALPs at colliders

Mimasu

Sanz

2015

J. High Energ. Phys.

191

205

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“…For a recent review of the astrophysical constraints on ALPs see Ref. [38] and reference therein. In all cases, these constraints only apply when the ALP mass, m φ , lies within a certain range e.g m low < m φ < m high .…”

Section: Constraints On Axion-like-particlesmentioning

confidence: 99%

Detecting chameleons: The astronomical polarization produced by chameleonlike scalar fields

2009

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We show that a coupling between chameleon-like scalar fields and photons induces linear and circular polarization in the light from astrophysical sources. In this context chameleon-like scalar fields includes those of the Olive-Pospelov (OP) model, which describes a varying fine structure constant. We determine the form of this polarization numerically and give analytic expressions in two useful limits. By comparing the predicted signal with current observations we are able to improve the constraints on the chameleon-photon coupling and the coupling in the OP model by over two orders of magnitude. It is argued that, if observed, the distinctive form of the chameleon induced circular polarization would represent a smoking gun for the presence of a chameleon. We also report a tentative statistical detection of a chameleon-like scalar field from observations of starlight polarization in our galaxy.

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“…using the DFSZ [97] or the KSVZ [98,99] model. The strongest lower bound is coming from the SN 1987A supernova event, suggesting f a 10 −9 GeV [96]. An upper bound is set by the known abundance of the cold dark matter.…”

Section: Topological Susceptibility At High Temperaturesmentioning

confidence: 99%

“…For this several cosmological constraints exist [96]. To derive these model dependent assumptions for the axion couplings have to be made, e.g.…”

Section: Topological Susceptibility At High Temperaturesmentioning

confidence: 99%