EFFECTS OF PAIR CREATION ON THE EXPANSION OF VACUUM BUBBLESfct
نویسنده
چکیده
The real-time behavior of true-vacuum bubbles nucleated in the false-vacuum background is studied in a Q4 -theory. Classically, the bubble expansion rate has been known to approach the velocity of light asymptotically. A quantum effect, creation of Higgs and fermion pairs, is studied by a semiclassical method, and is shown to lead to a slower expansion rate. Within the thin-wall approximation, several possible asymptotic behaviors are examined. A solution that behaves like the classical one but with different coefficients is shown to be stable, The first order corrections to the coefficients are calculated approximately. The created Higgs pairs are found to remain inside the bubble and carry an energy of approximately 10B3 X of the energy released from the false vacuum. The fermions that are massless in the false vacuum go out of the bubble and have energy N 10 -3 g2 , where g is the Yukawa coupling constant. It is shown that the resulting asymptotic state is Lorentz-invariant. Submitted to Nuclear Physics B * Work supported in part by the Department of Energy, under contracts DE-AC03-81-ER40050 (Caltech) and DE-ACO3-76SFOO515 (SLAC). 'Revised version for CALT-68-925.
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