INVESTIGADORES
HANSEN Patricia Maria
artículos
Título:
Testing effects of Lorentz invariance violation in the propagation of astroparticles with the Pierre Auger Observatory
Autor/es:
THE PIERRE AUGER COLLABORATION (P HANSEN PERTENECE A LA COLABORACIÓN AUGER)
Revista:
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2022
ISSN:
1475-7516
Resumen:
Lorentz invariance violation (LIV) is often described by dispersion relations of theform Ei 2 = m2 i + p2 i + δi,nE 2+n with delta different based on particle type i, with energy E,momentum p and rest mass m. Kinematics and energy thresholds of interactions are modifiedonce the LIV terms become comparable to the squared masses of the particles involved. Thus,the strongest constraints on the LIV coefficients δi,n tend to come from the highest energies.At sufficiently high energies, photons produced by cosmic ray interactions as they propagatethrough the Universe could be subluminal and unattenuated over cosmological distances.Cosmic ray interactions can also be modified and lead to detectable fingerprints in the energyspectrum and mass composition observed on Earth. The data collected at the Pierre AugerObservatory are therefore possibly sensitive to both the electromagnetic and hadronic sectorsof LIV. In this article, we explore these two sectors by comparing the energy spectrum andthe composition of cosmic rays and the upper limits on the photon flux from the Pierre AugerObservatory with simulations including LIV. Constraints on LIV parameters depend stronglyon the mass composition of cosmic rays at the highest energies. For the electromagnetic sector,while no constraints can be obtained in the absence of protons beyond 1019 eV, we obtainδγ,0 > −10−21 , δγ,1 > −10−40 eV −1 and δγ,2 > −10−58 eV−2 in the case of a subdominantproton component up to 1020 eV. For the hadronic sector, we study the best description ofthe data as a function of LIV coefficients and we derive constraints in the hadronic sectorsuch as δhad,0 < 10−19 , δhad,1 < 10−38 eV−1 and δhad,2 < 10−57 eV−2 at 5σ CL.