Testing the neutrality of matter by acoustic means in a spherical resonator

Bressi, G.; Carugno, G.; Valle, F. Della; Galeazzi, G.; Ruoso, G.; Sartori, G.

doi:10.1103/physreva.83.052101

Cited by 44 publications

(52 citation statements)

References 51 publications

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“…The above constraint on the value of y is consistent with the result obtained in lab experiments if we take λ A ∼ d H ∼ 10 28 cm [31].…”

Section: B Statistical Mechanics Of Massive Photonssupporting

confidence: 89%

“…In fact, a nonzero total charge can arise from several possibilities, including difference in the magnitude of electron and proton charges, nonvanishing charge of neutrons and neutrinos, and asymmetry of matter and antimatter. Observational and experimental tests of the charge difference and asymmetry are being persistently carried on by researchers, although positive results have not been obtained yet [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Electrodynamics on cosmological scales

2016

Gen Relativ Gravit

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Maxwell's equations cannot describe a homogeneous and isotropic universe with a uniformly distributed net charge, because the electromagnetic field tensor in such a universe must be vanishing everywhere. For a closed universe with a nonzero net charge, Maxwell's equations always fail regardless of the spacetime symmetry and the charge distribution. The two paradoxes indicate that Maxwell's equations need be modified to be applicable to the universe as a whole. We consider two types of modified Maxwell equations, both can address the paradoxes. One is the Proca-type equation which contains a photon mass term. This type of electromagnetic field equations can naturally arise from spontaneous symmetry breaking and the Higgs mechanism in quantum field theory, where photons acquire a mass by eating massless Goldstone bosons. However, photons loose their mass again when the symmetry is restored, and the paradoxes reappear. The other type of modified Maxwell equations, which are more attractive in our opinions, contain a term with the electromagnetic field potential vector coupled to the spacetime curvature tensor. This type of electromagnetic field equations do not introduce a new dimensional parameter and return to Maxwell's equations in a flat or Ricci-flat spacetime. We show that the curvature-coupled term can naturally arise from the ambiguity in extending Maxwell's equations from a flat spacetime to a curved spacetime through the "minimal substitution rule". Some consequences of the modified Maxwell equations are investigated. The results show that for reasonable parameters the modification does not affect existing experiments and observations. However, we argue that, the field equations with a curvature-coupled term can be testable in astrophysical environments where the mass density is high or the gravity of electromagnetic radiations plays a dominant role in dynamics, e.g., the interior of neutron stars and the early universe.

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“…The above constraint on the value of y is consistent with the result obtained in lab experiments if we take λ A ∼ d H ∼ 10 28 cm [31].…”

Section: B Statistical Mechanics Of Massive Photonssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Electrodynamics on cosmological scales

2016

Gen Relativ Gravit

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“…[29], but the authors of that reference derive q ν = (−0.6 ± 3.2) × 10 −21 e from the (non)neutrality of matter in Ref. [32]. We find that neutrino charges of this order of magnitude make a negligible contribution to the stimulated νν emission cross section.…”

Section: B Neutrino Magnetic and Electric Dipole Momentsmentioning

confidence: 59%

Shining light on the mass scale and nature of neutrinos with eγ→eνν¯

et al. 2018

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The discovery of neutrino oscillations invites many fundamental physics questions that have yet to be answered. Two of these questions are simple, easy to state, and essential: What are the values of the neutrino masses? Are neutrinos Majorana fermions? The reason we don't know the answer to those questions is that it is difficult to measure neutrino properties outside of the ultrarelativistic regime. We discuss the physics of eγ → eνν near threshold, where one has access to nonrelativistic neutrinos and only nonrelativistic neutrinos. Near threshold, eγ → eνν is a rich phenomenon and its cross section is sensitive to the individual values of the neutrino masses and the nature of the neutrinos. We show that if one could scan the threshold region, it would be simple to identify the mass of the lightest neutrino, the neutrino mass ordering, and whether the neutrinos are Majorana fermions. In practice, however, event rates are tiny and backgrounds are huge; the observation of eγ → eνν in the sub-eV regime appears to be utterly inaccessible in the laboratory. Our results, nonetheless, effectively illustrate the discriminatory power of nonrelativistic neutrino observables.

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“…Assuming that atomic hydrogen (H) is itself charge neutral, CPT demands that antihydrogen also be charge neutral. While there do not appear to be extraordinarily precise measurements on H itself, other normal-matter atoms and molecules are known to be neutral to remarkable precision [13]: to about e 10 21 − for diverse species such as He, H 2 , and SF 6 , where e is the elementary charge. The methods used in these studies are unsuitable for antihydrogen as they require macroscopic quantities of atoms or molecules; to date, only about 500 antihydrogen atoms have been trapped and detected, and there are no prospects for trapping macroscopic quantities.…”

Section: Introductionmentioning

confidence: 99%

Using stochastic acceleration to place experimental limits on the charge of antihydrogen

et al. 2014

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Assuming hydrogen is charge neutral, CPT invariance demands that antihydrogen also be charge neutral. Quantum anomaly cancellation also demands that antihydrogen be charge neutral. Standard techniques based on measurements of macroscopic quantities of atoms cannot be used to measure the charge of antihydrogen. In this paper, we describe how the application of randomly oscillating electric fields to a sample of trapped antihydrogen atoms, a form of stochastic acceleration, can be used to place experimental limits on this charge.

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Testing the neutrality of matter by acoustic means in a spherical resonator

Cited by 44 publications

References 51 publications

Electrodynamics on cosmological scales

Electrodynamics on cosmological scales

Shining light on the mass scale and nature of neutrinos with eγ→eνν¯

Using stochastic acceleration to place experimental limits on the charge of antihydrogen

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