Updated bounds on milli-charged particles

Davidson, Sacha; Hannestad, Steen; Raffelt, Georg G.

doi:10.1088/1126-6708/2000/05/003

Cited by 479 publications

(685 citation statements)

References 39 publications

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“…Currently, the record for the most stringent bounds on MCPs parameters [e. g., relative charge parameter ǫ 10 −14 for masses below a few keV] result from arguments related to stellar cooling [43] which are not observed in Horizontal Branch stars. This exclusion limit is, nonetheless, somewhat arguable since the inclusion of macroscopic parameters such as the density and the temperature of the star might attenuate it significantly [44,45].…”

Section: Jhep06(2015)177mentioning

confidence: 99%

“…For MCPs, the most stringent limits have been set from the absence of anomalous stellar evolutions, presumably induced by the energy loss accompanied by their emissions from the star. When considering this idea in the helium-burning phase of Horizontal-Branch (HB) stars, the coupling strengh turns out to be bounded by [43] ǫ ≤ 2 × 10 −14 for m ǫ keV. Less stringent limits have been found from the solar monitoring of neutrino flux.…”

Section: Jhep06(2015)177mentioning

confidence: 99%

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Light dark matter candidates in intense laser pulses I: paraphotons and fermionic minicharged particles

Villalba-Chávez

Müller

2015

J. High Energ. Phys.

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Polarimetric experiments driven by the strong field of a circularly polarized laser wave can become a powerful tool to limit the parameter space of not yet detected hidden-photons and minicharged particles associated with extra U(1) gauge symmetries. We show how the absorption and dispersion of probe electromagnetic waves in the vacuum polarized by such a background are modified due to the coupling between the visible U(1)-gauge sector and these hypothetical degrees of freedom. The results of this analysis reveal that the regime close to the two-photon reaction threshold can be a sensititive probe of these hidden particles. Parameters of modern laser systems are used to estimate the projected sensitivities on the corresponding coupling constants in regions where experiments driven by dipole magnets are less constricted. The role played by a paraphoton field is analyzed via a comparison with a model in which the existence of minicharges is assumed only. For both scenarios is found that the most stringent exclusion limit occurs at the lowest threshold mass; this one being determined by a certain combination of the field frequencies and dictated by energy momentum balance of the photo-production of a pair of minicharged particles. The dependencies of the observables on the laser attributes as well as on the unknown particle parameters are also analyzed.

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Section: Jhep06(2015)177mentioning

confidence: 99%

Section: Jhep06(2015)177mentioning

confidence: 99%

Light dark matter candidates in intense laser pulses I: paraphotons and fermionic minicharged particles

Villalba-Chávez

Müller

2015

J. High Energ. Phys.

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“…Therefore, to determine the upper bounds existing on the photon over cosmic rays ratios, we will need to know (in some cases) what are the bounds which hold on the millicharge of a metastable particle within the mass range we consider, m DM = O(100 − few 10 4 ) GeV. In this mass range, there are no relevant accelerator constraints [16][17][18][19]. There are nevertheless stringent constraints from cosmology as well as from direct detection data.…”

Section: Jhep08(2014)133mentioning

confidence: 99%

Can a millicharged dark matter particle emit an observable γ-ray line?

Aisati

Hambye

Scarna

2014

J. High Energ. Phys.

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If a γ-ray line is observed in the near future, it will be important to determine what kind of dark matter (DM) particle could be at its origin. We investigate the possibility that the γ-ray line would be induced by a slow DM particle decay associated to the fact that the DM particle would not be absolutely neutral. A "millicharge" for the DM particle can be induced in various ways, in particular from a kinetic mixing interaction or through the Stueckelberg mechanism. We show that such a scenario could lead in specific cases to an observable γ-ray line. This possibility can be considered in a systematic modelindependent way, by writing down the corresponding effective theory. This allows for a multi-channel analysis, giving in particular upper bounds on the intensity of the associated γ-ray line from cosmic rays emission. Our analysis includes the possibility that in the twobody decay the photon is accompanied with a neutrino. We show that, given the stringent constraints which hold on the millicharge of the neutrinos, this is not an option, except if the DM particle mass lies in the very light KeV-MeV range, allowing for a possibility of explanation of the recently claimed, yet to be confirmed, ∼ 3.5 KeV X-ray line.

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“…It is generally argued that the astrophysical limits on epsilon are very stringent, ǫ < ∼ 10 −14 , arising from energy loss considerations in stars [9,10]. Interestingly though, the published limits apply only in the millicharged mass region above about 1 eV (see e.g.…”

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confidence: 99%

“…figure 1 of ref. [10]). For masses significantly above around 1 eV, the number density of millicharged particles in stars can become Boltzman suppressed (exp(−m e ′ /T )).…”

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confidence: 99%

A simple explanation of the PVLAS anomaly in spontaneously broken mirror models

Foot

Kobakhidze

2007

Physics Letters B

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The PVLAS anomaly can be explained if there exist millicharged particles of mass < ∼ 0.1 eV and electric charge ǫ ∼ 10 −6 e. We point out that such particles occur naturally in spontaneously broken mirror models. We argue that this interpretation of the PVLAS anomaly is not in conflict with astrophysical constraints due to the self interactions of the millicharged particles which lead them to be trapped within stars. This conclusion also holds for a generic paraphoton model.

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Updated bounds on milli-charged particles

Cited by 479 publications

References 39 publications

Light dark matter candidates in intense laser pulses I: paraphotons and fermionic minicharged particles

Light dark matter candidates in intense laser pulses I: paraphotons and fermionic minicharged particles

Can a millicharged dark matter particle emit an observable γ-ray line?

A simple explanation of the PVLAS anomaly in spontaneously broken mirror models

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