Placing direct limits on the mass of earth-bound dark matter

Adler, Stephen L.

doi:10.1088/1751-8113/41/41/412002

Cited by 30 publications

(33 citation statements)

References 21 publications

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“…We focus on the relaxion halo hosted by the Sun and by the Earth. In this case, M ext is either the mass of the Sun [50], or (left side, assuming a Solar halo) planetary ephemerides [51]. We also require M ≤ M ext /2 (boundary of gray shaded region), as explained in the Supplementary Material S2.…”

Section: Relaxion Halomentioning

confidence: 99%

“…One can determine an upper bound on the mass M of a relaxion halo through gravitational observations. In the case of an Earth-based halo, the strongest constraint arises from lunar laser ranging [50], and for a Solar-based halo, from planetary ephemerides [51]; both are described in the Supplementary Material S2. 2 We show the derived constraint on the mass of a relaxion halo as a function of the scalar particle mass m φ in Fig.…”

Section: Relaxion Halomentioning

confidence: 99%

“…We consider other possible constraints on an Earth halo in Supplementary Material S3, but conclude that[50] represents the strongest constraint.…”

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confidence: 99%

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Relaxion stars and their detection via atomic physics

et al. 2020

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The cosmological relaxion can address the hierarchy problem, while its coherent oscillations can constitute dark matter in the present universe. We consider the possibility that the relaxion forms gravitationally bound objects that we denote as relaxion stars. The density of these stars would be higher than that of the local dark matter density, resulting in enhanced signals in table-top detectors, among others. Furthermore, we raise the possibility that these objects may be trapped by an external gravitational potential, such as that of the Earth or the Sun. This leads to formation of relaxion halos of even greater density. We discuss several interesting implications of relaxion halos, as well as detection strategies to probe them. I. INTRODUCTIONResolving the nature of the dark matter (DM) is one of the most fundamental questions in modern physics [1]. Although particle DM at the electroweak scale is a highly motivated solution [2], no discovery of such DM was made to date, either directly [3-5], indirectly [6] or at the LHC [7]. Another intriguing possibility is that of a cold, ultra-light, DM field, coherently oscillating to account for the observed DM density. We consider a class of models where a light scalar particle composes the DM. A well-motivated example is the relaxion, where even a minimal model that addresses the hierarchy problem [8] may lead to the right relic abundance in a manner similar to axion models, however geared with a dynamical misalignment mechanism [9] for relaxion masses roughly above 10 −11 eV. Due to spontaneous CP violation, the relaxion mixes with the Higgs, and, as a result, acquires both pseudoscalar and scalar couplings to the Standard Model (SM) fields [10,11] (this effect could be suppressed in particle-production-based models [12]). The latter distinguishes the relaxion from axion dark matter, which has only pseudoscalar couplings, and where the same property of generation of CP violation was shown to lead to a solution of the strong CP problem [13] as well as potentially generating the cosmological baryon asymmetry [14].A striking consequence of the relaxion-Higgs mixing is that, as the relaxion forms a classical oscillating DM background, all basic constants of nature effectively vary with time since they all depend on the Higgs vacuum expectation value [9]. (For earlier discussion in the context of dilaton DM see [15][16][17].) There are active experimental efforts searching for this form of scalar DM (e.g. [18][19][20][21][22][23][24]). Despite the unprecedented accuracy achieved by the various searches, none of the current experiments reach the sensitivity required to probe physically motivated models. Furthermore, the resulting sensitivity in the region of our main interest, characterised by oscillation frequencies above the Hz level, is weaker than that of the probes related to fifth-force searches and equivalence-principle tests (see e.g. [10, 15-17, 20, 21, 24-27]).In this paper, we demonstrate that if the scalar DM forms a self-gravitating compact object, usually ...

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Section: Relaxion Halomentioning

confidence: 99%

Section: Relaxion Halomentioning

confidence: 99%

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Relaxion stars and their detection via atomic physics

et al. 2020

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“…There are several limits obtained studying the motion of celestial body in the solar system. For example Adler [45] obtains a direct upper limit of the mass of Earth-bound dark matter lying between the radius of the moon orbit and the geodetic satellite orbit. The value obtained is 0.13 kg/km 3 , larger than our limit shown in fig.16.…”

Section: Newtoritesmentioning

confidence: 99%

Dark matter searches using gravitational wave bar detectors: Quark nuggets and newtorites

Bassan

Coccia

D’Antonio

et al. 2016

Astroparticle Physics

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Many experiments have searched for supersymmetric WIMP dark matter, with null results. This may suggest to look for more exotic possibilities, for example compact ultra-dense quark nuggets, widely discussed in literature with several different names. Nuclearites are an example of candidate compact objects with atomic size cross section. After a short discussion on nuclearites, the result of a nuclearite search with the gravitational wave bar detectors Nautilus and Explorer is reported. The geometrical acceptance of the bar detectors is 19.5 m(2) sr, that is smaller than that of other detectors used for similar searches. However, the detection mechanism is completely different and is more straightforward than in other detectors. The experimental limits we obtain are of interest because, for nuclearites of mass less than 10(-5) g, we find a flux smaller than that one predicted considering nuclearites as dark matter candidates. Particles with gravitational only interactions (newtorites) are another example. In this case the sensitivity is quite poor and a short discussion is reported on possible improvements. (C) 2016 Elsevier B.V. All rights reserved

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“…As the mass increases the limit reaches a plateau. Adler [6] obtains a direct upper limit of the mass of Earth-bound dark matter lying between the radius of the moon orbit and the geodetic satellite orbit…”

Section: Newtorite and Macro Limits And Possible Improvementsmentioning

confidence: 99%

Newtorites in bar detectors of gravitational wave

Ronga

2016

J. Phys.: Conf. Ser.

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The detection of particles with only gravitational interactions (Newtorites) in gravitational bar detectors was studied in 1984 by Bernard, De Rujula and Lautrup. The negative results of dark matter searches suggest to look to exotic possibilities like Newtorites. The limits obtained with the Nautilus bar detector will be presented and the possible improvements will be discussed. Since the gravitational coupling is very weak, the possible limits are very far from what is needed for dark matter, but for large masses are the best limits obtained on the Earth. An update of limits for MACRO particles will be given.

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Placing direct limits on the mass of earth-bound dark matter

Cited by 30 publications

References 21 publications

Relaxion stars and their detection via atomic physics

Relaxion stars and their detection via atomic physics

Dark matter searches using gravitational wave bar detectors: Quark nuggets and newtorites

Newtorites in bar detectors of gravitational wave

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