Cosmology with a very light Lμ − Lτ gauge boson

  title={Cosmology with a very light L$\mu$ − L$\tau$ gauge boson},
  author={M. Escudero and D. Hooper and G. Krnjaic and M. Pierre},
  journal={Journal of High Energy Physics},
A bstractIn this paper, we explore in detail the cosmological implications of an abelian Lμ − Lτ gauge extension of the Standard Model featuring a light and weakly coupled Z′. Such a scenario is motivated by the longstanding ∼ 4σ discrepancy between the measured and predicted values of the muon’s anomalous magnetic moment, (g − 2)μ, as well as the tension between late and early time determinations of the Hubble constant. If sufficiently light, the Z′ population will decay to neutrinos… Expand
Resolving the Hubble tension in a U(1)Lμ−Lτ model with Majoron
In this paper, we explore possibilities of resolving the Hubble tension and (g − 2)μ anomaly simultaneously in a U(1)Lμ−Lτ model with Majoron. We only focus on a case where the Majoron φ does notExpand
Solar neutrino probes of the muon anomalous magnetic moment in the gauged U(1)Lμ−Lτ
Models of gauged U(1)Lμ−Lτ can provide a solution to the long-standing discrepancy between the theoretical prediction for the muon anomalous magnetic moment and its measured value. The extraExpand
New physics in light of the H0 tension: An alternative view
The strong discrepancy between local and early-time (inverse distance ladder) estimates of the Hubble constant H0 could be pointing towards new physics beyond the concordance ΛCDM model. SeveralExpand
Precision early universe thermodynamics made simple: Neff and neutrino decoupling in the Standard Model and beyond
Precision measurements of the number of effective relativistic neutrino species and the primordial element abundances require accurate theoretical predictions for early Universe observables in theExpand
Constraining the Self-Interacting Neutrino Interpretation of the Hubble Tension.
It is demonstrated that interactions of the necessary size imply the existence of a force carrier with a large neutrino coupling (>10^{-4}) and mass in the keV-100 MeV range, and that a UV-complete model requires a nonminimal mechanism to simultaneously generate neutrinos masses and appreciable self-interactions. Expand
A CMB search for the neutrino mass mechanism and its relation to the Hubble tension
The majoron, a pseudo-Goldstone boson arising from the spontaneous breaking of global lepton number, is a generic feature of many models intended to explain the origin of the small neutrino masses.Expand
$U(1)_{L_\mu-L_\tau}$ for Light Dark Matter, $g_\mu-2$, the $511$ keV excess and the Hubble Tension
In this paper we introduce a light Dirac particle ψ as thermal dark matter candidate in a U(1)Lμ−Lτ model. Together with the new gauge boson X, we find a possible parameter space with mX ' 20 MeV,Expand
A testable hidden-sector model for Dark Matter and neutrino masses
We consider a minimal extension of the Standard Model with a hidden sector charged under a dark local U(1) ′ gauge group, accounting simultaneously for light neutrino masses and the observed DarkExpand
Probing the muon $g-2$ with future beam dump experiments
We consider the light Z ′ explanation of the muon g − 2 anomaly. Even if such a Z ′ has no tree-level coupling to electrons, in general one will be induced at looplevel. We show that future beam dumpExpand
Low scale seesaw models for low scale U(1)Lμ−Lτ symmetry
We propose models for neutrino masses and mixing in the framework of low scale $U(1)_{L_\mu-L_\tau}$ gauge extension of the standard model. The models are designed to spontaneously breakExpand


Self-interacting dark matter and muon ( g − 2 ) in a gauged U ( 1 ) L μ − L τ model
We construct a self-interacting dark matter model that could simultaneously explain the observed muon anomalous magnetic moment. It is based on a gauged U(1)Lμ−Lτ extension of the standard model,Expand
Explaining dark matter and B decay anomalies with an Lμ − Lτ model
A bstractWe present a dark sector model based on gauging the Lμ − Lτ symmetry that addresses anomalies in b → sμ+μ− decays and that features a particle dark matter candidate. The dark matter particleExpand
Searching for MeV-scale gauge bosons with IceCube
Light gauge bosons can lead to resonant interactions between high-energy astrophysical neutrinos and the cosmic neutrino background. We study this possibility in detail, considering the ability ofExpand
Early Dark Energy can Resolve the Hubble Tension.
This work considers two physical models for this early dark energy EDE, one involving an oscillating scalar field and another a slowly rolling field, and performs a detailed calculation of the evolution of perturbations in these models. Expand
MeV-scale reheating temperature and thermalization of the neutrino background
The late-time entropy production by the massive particle decay induces the various cosmological effects in the early epoch and modify the standard scenario. We investigate the thermalization processExpand
Detecting the $L_{\mu}-L_{\tau}$ gauge boson at Belle II
We discuss the feasibility of detecting the gauge boson of the U(1)Lμ-Lτ symmetry, which possesses a mass in the range between MeV and GeV, at the Belle-II experiment. The kinetic mixing between theExpand
Neutrino trident production: a powerful probe of new physics with neutrino beams.
The production of a μ+ μ- pair from the scattering of a muon neutrino off the Coulomb field of a nucleus is shown to be an exquisitely sensitive probe in the search for new neutral currents among leptons, putting the strongest constraints on well-motivated and well-hidden extensions of the standard model gauge group. Expand
Probing the muon $g_\mu-2$ anomaly, $L_{\mu} - L_{\tau}$ gauge boson and Dark Matter in dark photon experiments
Abstract In the L μ − L τ model the 3.6 σ discrepancy between the predicted and measured values of the anomalous magnetic moment of positive muons can be explained by the existence of a new darkExpand
Cosmological bounds on neutrino degeneracy improved by flavor oscillations
Abstract We study three-flavor neutrino oscillations in the early universe in the presence of neutrino chemical potentials. We take into account all effects from the background medium, i.e.,Expand
Converting nonrelativistic dark matter to radiation
Dark matter in the cosmological concordance model is parameterised by a single number, describing the covariantly conserved energy density of a non-relativistic fluid. Here we test this assumption inExpand