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We discuss a possible scenario to induce a bubble universe using buildablebubbles. First, we observe that if there is no violation of the null energycondition, all bubbles are buildable and do not have inflation if their initialconditions are assigned along the in-going null surface in an almost flatbackground. However, if the null energy condition is sufficiently violated,then the generation of a bubble universe is possible. Second, the author willobserve that a sufficient violation of the null energy condition may bepossible using a buildable bubble due to the Hawking radiation of a de Sitterspace. Note that buildable bubbles seem surely to be allowed in quantumgravity. Therefore, if this scenario is correct, the generation of a bubbleuniverse and the violation of unitarity should be allowed in quantum gravity.

Generation of a bubble universe and the information loss problem