Search Results for author: Georg Raffelt

Found 4 papers, 1 papers with code

Axion and neutrino bounds improved with new calibrations of the tip of the red-giant branch using geometric distance determinations

no code implementations7 Jul 2020 Francesco Capozzi, Georg Raffelt

The brightness of the tip of the red-giant branch (TRGB) allows one to constrain novel energy losses that would lead to a larger core mass at helium ignition and thus to a brighter TRGB than expected by standard stellar models.

Solar and Stellar Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology

Grand Unified Neutrino Spectrum at Earth: Sources and Spectral Components

no code implementations25 Oct 2019 Edoardo Vitagliano, Irene Tamborra, Georg Raffelt

We briefly review the dominant neutrino fluxes at Earth from different sources and present the Grand Unified Neutrino Spectrum ranging from meV to PeV energies.

High Energy Astrophysical Phenomena High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Theory

Distinguishing Dirac and Majorana neutrinos by their gravi-majoron decays

1 code implementation3 May 2019 Lena Funcke, Georg Raffelt, Edoardo Vitagliano

Neutrinos may acquire small Dirac or Majorana masses by new low-energy physics in terms of the chiral gravitational anomaly, as proposed by Dvali and Funcke (2016).

High Energy Physics - Phenomenology

Solar neutrino limit on axions and keV-mass bosons

no code implementations18 Jul 2008 Paolo Gondolo, Georg Raffelt

The all-flavor solar neutrino flux measured by the Sudbury Neutrino Observatory (SNO) constrains nonstandard energy losses to less than about 10% of the Sun's photon luminosity, superseding a helioseismological argument and providing new limits on the interaction strength of low-mass particles.

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