Eur Phys J C (2004) 33: s862-s864
https://doi.org/10.1140/epjcd/s2003-03-919-8

PS09 Neutrino Properties and Oscillations

Random matter density perturbations and LMA

¹ Centro de Ciências Exatas, Ambientais e de Tecnologias, Pontifícia Universidade Católica de Campinas, Caixa Postal 317, 13020-970 Campinas, SP, Brasil
² Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas - UNICAMP, 13083-970 Campinas, SP, Brasil

Received: 15 October 2003
Accepted: 24 October 2003
Published online: 30 October 2003

Abstract

There are reasons to believe that mechanisms exist in the solar interior which lead to random density perturbations in the resonant region of the Large Mixing Angle solution to the solar neutrino problem. We find that, in the presence of these density perturbations, the best fit point in the () parameter space moves to smaller values, compared with the values obtained for the standard LMA solution. Combining solar data with KamLAND results, we find a new compatibility region, which we call VERY-LOW LMA, where and Δ m ²≈ 2× 10^–5 eV², for random density fluctuations of order . We argue that such values of density fluctuations are still allowed by helioseismological observations at small scales of order 10 - 1000 km deep inside the solar core.

PACS: 26.65 – 90.60J – 96.60.H