We present here a scenario , based on a low reheating temperature T _ { R } \ll 100 MeV at the end of ( the last episode of ) inflation , in which the coupling of sterile neutrinos to active neutrinos can be as large as experimental bounds permit ( thus making this neutrino “ visible ” in future experiments ) .
In previous models this coupling was forced to be very small to prevent a cosmological overabundance of sterile neutrinos .
Here the abundance depends on how low the reheating temperature is .
For example , the sterile neutrino required by the LSND result does not have any cosmological problem within our scenario .