Recent X-ray observations in the central compact remnant of Puppis A and other young pulsars have provided convincing evidence about the anti-magnetar nature of the so-called central compact objects ( CCOs ) .
The measured period derivative , corrected by the proper movement , provides exceptionally low superficial magnetic fields for such sources .
Using the dipole radiation canonical model , the superficial magnetic field of the CCO ( RX J0822-4300 ) in Puppis A was estimated to be B \simeq 2.9 \times 10 ^ { 10 } G. In this paper , we present a numerical model to interpret the unusual magnetic-field behavior in RX J0822-4300 .
Using the magnetohydrodynamic simulations during the hypercritical accretion phase , we propose that a variety of MeV neutrinos is created given evidence about the submergence of the magnetic field in the pulsar .
We investigate the production , propagation , oscillations , and detection of MeV neutrinos from this source .
The detection of neutrino events with their flavor ratios would be a compelling signature of the decreasing evolution of the magnetic field not only in RX J0822-4300 but also in CCO candidates .