Comments on the paper ``Bare Quark Surfacees of Strange Stars and Electron-Positron Pair Emission''

摘要

In a recent paper (Ushov, PRL, 80, 230, 1998), it has been claimed that thebare surface of a strange star can emit electron-positron pairs of luminosity\~10^{51} ergs/s for about 10s. If true, obviously, this mechanism may explainthe origin of cosmic Gamma Ray Bursts. However, we point out that such amechanism is does not work because (i) if pair production really occurs thesupposed pre-existing supercritical electric field will be quenched and thisdischarge process may at best release ~10^{24} ergs of electromagnetic energy,and (ii) there is no way by which the trapped core thermal energy of few10^{52} ergs can be transmitted electromagnetically on a time scale of ~10s oreven on a much larger time scale. The only way the hot core can cool on a timescale of ~10 s or much shorter is by the well known process of emission ofnu-antinu pairs.