WISP Dark Matter Experiments

There are several experiments, which are searching for WISPs in the region, similar to the ALPS using different experimental techniques. A short summary of the several searches, performed at different experiments are shown in the sensitivity plots for ALPs. Sensitivity plots show the kinematic plane with coupling constant and particle mass at the axis. Exclusion limits set by several performed experiments are compared with exclusion limit of ALPS I and expected sensibility of ALPS II.


Using data of the measurements and observations explained below it is possible to interactively.

Designed sinsitivity of the ALPS II experiment was discussed in details in the technical design report (JINST 8 (2013) T09001). The improvement of about 3 orders of magnitute is well shown on the plot.

The OSQAR experiment is another implementation of the "light-shining-through-a-wall" (LSW) strategy. The last results reached ALPS I sensitivity (Phys.Rev. D92 (2015) no.9, 092002).

PVLAS experiment is mostly focused on the measurement of vacuum birefringence using optical cavities and magnets. However their experimental setup is similar to LSW experiments and therefore also sensitive to ALPs. Exclusion limits are based on results published in 2016 (Eur. Phys. J. C (2016) 76:24).

The CAST experiment uses the sun as a source of ALPs flow and covers wide range for masses of expected ALPs. Exclusion limits are based on many observations (http://cast.web.cern.ch/CAST/cast_pub.php).

Another experiment, which is similarly to CAST uses ALPs flow from the sun is IAXO. This experiment is currently in design phase and possible exclusion limits are base on design sensitivity (CERN-SPSC-2013-022; SPSC-I-242)

Several exclusion limits as well as hints are based on the observation of distant space objects. These exclusion limits depends on implied models, such as models of star evolution and distribution of matter and magnetic field in universe.

Bounds on a coupling of ALPs was calculated based on observation of supernova SN1987A.

Observation of supernova SN1987A shown lack of a gamma-ray signal in the GRS instrument of the SMM satellite in coincidence with the observation of the neutrinos emitted from this object. In a core-collapse supernova, ALPs would be emitted via the Primakoff process, and eventually convert into gamma rays in the magnetic field of the Milky Way. The lack of a gamma-ray signal in the GRS instrument of the SMM satellite in coincidence with the observation of the neutrinos emitted from SN1987A therefore provides a bound on their coupling to photons (JCAP 1502 (2015) no.02, 006).

The Fermi-LAT (Fermi Large Area Telescope) collaboration reports a search for spectral irregularities induced by oscillations between photons and ALPs in the gamma-ray spectrum of NGC 1275. The lower limit on ALPs coupling is based on 6 years of observations (PRL 116, 161101 (2016)). They also estimate a sensitivity to ALPs coupling in case if a SN order of 10 solar masses explodes in our Galaxy (arXiv:1609.02350).

The observations of very high energy gamma-rays give a hits for ALPs search (Phys.Rev. D87 (2013) no.3, 035027).

ADMX uses a large microwave cavity within a superconducting magnet to search for cold dark matter axions in the local galactic dark matter halo. In a contrast to LSW experiments the axions are coming from the universe. The results on ALPs limits from ADMX covers narrow range of invariant masses, but goes down to very low coupling constant (https://indico.cern.ch/event/300768/session/0/contribution/30/attachments/566901/780884/Rosenberg-Patras_30jun14.pdf).

High precision spectroscopy, which tests the Coulomb's law was used as a probe of the hidden sector (http://journals.aps.org/prd/pdf/10.1103/PhysRevD.82.125020).

There are many experiments, which are setting limits on hidden sector by looking for solar hidden photons (http://arxiv.org/pdf/1210.1043v3.pdf, http://arxiv.org/pdf/0801.1527v2.pdf), or by observation HB-stars behavoir.

Hidden Photon Dark Matter Search with a Large Metallic Mirror demonstrates their preliminary results (http://arxiv.org/pdf/1509.02386v2.pdf). Compared to ALPS II they are more sensitivity to hidden photons with large masses (maximum sensitivity at 100eV).

Other experimental concept suggests to search for WISPs in radio regime (WISPers from the Dark Side: Radio Probes of Axions and Hidden Photons (D. Horns, A. Lindner, A.Lobanov, A. Ringwald), 2013 http://arxiv.org/pdf/1309.4170v1.pdf). This would allow to exploit lower mass region up to 10^-18 eV.

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