arXiv subjects

E. G. J. van Campenhout

Publications and source records attributed to E. G. J. van Campenhout.

3 recordsLinked to original sources

arXiv2026

Searches for coincident Gravitational Waves and High-Energy Neutrinos from the KM3NeT and ANTARES telescopes during O3

Various models predict that gravitational-wave sources produce high-energy neutrinos. Among them are compact binary coalescences with at least one neutron star, but also core-collapse supernovae or accretion disk instabilities. Two different analyses are presented, combining data from the LIGO and Virgo gravitational-wave detectors with those from the ANTARES and ORCA neutrino telescopes observed during the third observing run of LIGO-Virgo. In the first analysis, selected high-energy neutrino candidates were used as triggers to search for gravitational-wave candidates. In the second analysis, a search was conducted for potential spatial and temporal coincidences between subthreshold high-energy neutrino candidate events and subthreshold gravitational-wave candidates emitted by compact binary coalescence systems. In both searches, no significant coincidences were found. Upper limits on the rate of sources emitting both high-energy neutrinos and gravitational waves are presented. In particular, with the joint search, a joint source rate density upper limit of $8.8\times10^2~\mathrm{ Gpc^{-3}yr^{-1}}$ was found for a typical binary neutron star coalescence with a GW emitted energy of $10^{-1}~\rm M_\odot c^2$ and an isotropic energy emitted in neutrinos of $10^{51}~$erg.

astro-ph.HE↗

arXiv2026

Testing Heavy Dark Matter Decay as the Origin of KM3-230213A

This work explores the hypothesis that the ultra-high-energy neutrino event KM3-230213A originates from the decay of a heavy dark matter particle with a mass above PeV scale. The analysis exploits the deposited energy and arrival direction of the event as well as a complete detector Monte Carlo simulation to compute the expected signal distributions for different decay channels and assesses the relative contributions from Galactic and extragalactic dark matter. Assuming a dark matter origin of the event, we find that the preferred mass at 95% C.L. is larger than about 100 PeV in all scenarios considered, with best-fit lifetimes in the range $10^{26}$-$10^{27}$ s. These preferred regions are in tension with existing bounds from other neutrino telescopes and gamma-ray observations.

hep-ex↗

arXiv2026

Atmospheric neutrino constraints on Lorentz invariance violation with the first six detection units of KM3NeT/ORCA

Lorentz invariance is a fundamental symmetry underlying both the Standard Model of particle physics and General Relativity. Testing its validity provides a direct means of searching for new physics emerging near the Planck scale. A search for isotropic Lorentz invariance violation with 1.4 years of atmospheric neutrino data collected by a partial configuration of the KM3NeT/ORCA detector comprising six detection units is presented. No evidence for such violation is found; thus, competitive limits are set on a subset of isotropic Lorentz invariance violating coefficients, which complement and extend existing experimental constraints.

hep-ex↗