In quantum cosmology, one has to select a specific wave function solution of the quantum state equations under consideration in order to obtain concrete results. The simplest choices have been already explored, in different frameworks, yielding, in many cases, quantum bounces. As there is no consensually established boundary condition proposal in quantum cosmology, we investigate the consequences of enlarging known sets of initial wave functions of the universe, in the specific framework of the Wheeler-DeWitt equation interpreted along the lines of the de Broglie-Bohm quantum theory, on the possible quantum bounce solutions which emerge from them. In particular, we show that many asymmetric quantum bounces are obtained, which may incorporate non-trivial back-reaction mechanisms, as quantum particle production around the bounce, in the quantum background itself. In particular, the old hypothesis that our expanding universe might have arisen from quantum fluctuations of a fundamental quantum flat space-time is recovered, within a different and yet unexplored perspective.

中文翻译：

---

具有非对称量子反弹的宇宙学模型

在量子宇宙学中，必须选择所考虑的量子态方程的特定波函数解才能获得具体结果。已经在不同的框架中探索了最简单的选择，在许多情况下会产生量子反弹。由于在量子宇宙学中没有一致建立的边界条件提议，我们在沿着德布罗意-玻姆量子线解释的惠勒-德威特方程的特定框架中研究了扩大宇宙的已知初始波函数集的后果理论，关于从中产生的可能的量子反弹解决方案。特别是，我们表明获得了许多不对称的量子反弹，这可能包含非平凡的反向反应机制，因为反弹周围的量子粒子产生，在量子背景本身。特别是，我们从一个不同但尚未探索的角度恢复了我们膨胀的宇宙可能源于基本量子平面时空的量子涨落的旧假设。