ASTRONUS · Neutrinos in Astrophysics
6РП — Действия „Мария Кюри“
- Период
- 2005-10-01 → 2007-09-30
- Финансиране от ЕС
- 148 559 €
- Участници
- 1
- Схема
- IIF
Линиите свързват координатора с партньорите. За проекти отпреди 2014 г. CORDIS не винаги дава точни координати. Тези точки са на ниво град или държава.
Накратко на български
Турбулентността на материята при експлозиите на свръхнови влияе върху поведението на неутриното. Тези данни помагат за по-доброто разбиране на спектрите на неутриното и ускоряването на космическите лъчи.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - ASTRONUS (Neutrinos in Astrophysics)
The project aim was to study properties of turbulent matter density fluctuations and its influence on supernovae neutrino oscillations. The turbulent motion of matter behind the shock wave is created during the supernova explosion. The scales and strength of turbulent matter density fluctuations were extracted from the numerical simulations of supernova dynamics. The obtained results on matter density fluctuations in supernova were relevant not only for the analyses of supernova neutrino data but also for various astrophysical phenomena and, in particular, for the acceleration of cosmic rays. These results were used later in numerical calculations of supernova neutrino spectra accounting for matter density fluctuations generated during explosions. They demonstrated a significant dependence of neutrino spectra for some ranges of neutrino parameters. Additional tasks were also studied, with some of them being related to the main topic of the project. As such, a new method to probe non-standard neutrino-quark interactions using coherent neutrino scattering off nuclei was proposed. Relevant results had an important impact on the neutrino flavour conversion in supernovae. We also showed that future neutrino experiments searching for diffuse supernovae neutrino flux could not distinguish diffuse and solar antineutrino flux in the energy range below 15 MeV. A significant statistics of neutrino events of energies above 15 MeV was needed. Furthermore, the influence of stellar, or solar, magnetic fields on the spectra of stellar (solar) gravity modes was considered. Observed displacements of spectra of solar g-mode candidates were explained in the framework of the model with a central solar magnetic field. Finally, the possibility to detect a signal of gamma-ray source located behind the Sun using gamma-ray observatory in the models with axion-like particles was proposed. It was shown that next generation gamma-ray observatories would be able to test such a phenomenon.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The intriguing phenomenon of neutrino flavour oscillations is now firmly believed to explain the solar neutrino deficit and the atmospheric neutrino anomaly. New experiments in Europe and elsewhere will further delimit the neutrino mixing parameters, the absolute neutrino masses, and their Majorana nature.On the other hand, neutrino masses and oscillations can play an important role in astrophysics and cosmology that allows one to constrain the properties of these elusive particles in ways that are complementary to laboratory experiments, and conversely affect the interpretation of astrophysical neutrino data.The proposed Marie Curie project is devoted to neutrino oscillations in the astrophysical context, and particularly in the context of supernova physics. The main goal is to investigate how supernova neutrinos are affected by small-scale density fluctuations generated during the early explosion phase. The spatial scales of these fluctuations can be of the same order as a typical neutrino oscillation length and thus strongly affect the oscillations.The recent progress in numerical supernova research, notably in the Munich area, has led to three-dimensional simulations that should allow one to gain new insights into these questions. The oscillations in the presence of matter density fluctuations would modify both the neutrino flavour content and the energy spectra observable in neutrino detectors.The supernova small-scale density fluctuations will be modelled, numerical methods describing neutrino osillations in the fluctuating supernova interior will be developed, and the experimental sensitivities of current and proposed neutrino detectors will be estimated.This work will be crucial for the analysis of the neutrino signal from a future galactic supernova and for tuning the models. Moreover, the expected results will shed light on the understanding of the supernova shock reheating, the r-process nucleosynthesis, and the neutron-star kick phenomenon.
Оригинален текст от CORDIS (на английски).
Участници
- MAX PLANCK SOCIETY FO THE ADVANCEMENT OF SCIENCE · MUNCHENКоординаторНиво градГермания
Връзки
Данни: CORDIS, © Европейски съюз