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We show that the Coulomb barrier at the quark surface of a hot strange starmay be a powerful source of $e^+e^-$ pairs which are created in an extremelystrong electric field of the barrier and flow away from the star. Theluminosity in the outflowing pair plasma depends on the surface temperature$T_{_S}$ and may be very high, up to $\sim 3\times 10^{51} ergs/s$ at$T_{_S}\sim 10^{11}$ K. The effect of pair creation by the Coulomb barrier maybe a good observational signature of strange stars which can give an answer tothe question of whether a compact object is a neutron or strange star.Comment: 5 pages, 1 figure, LATEX, accepted for publication in the Physical  Review Letter

physical review letters

Bare Quark Matter Surfaces of Strange Stars and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Emission

Bare Quark Matter Surfaces of Strange Stars ande+e−Emission