Quantizing a dust-filled universe with positive cosmological constant yields a unitary wave packet whose expectation value bounces, avoiding the classical Big Bang singularity.
For physically well-behaved solutions (analogous to normalizable bound states), the cosmological con- stant Λ becomes quantized
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Unitary quantum matter-bounce in a universe with a positive cosmological constant
Quantizing a dust-filled universe with positive cosmological constant yields a unitary wave packet whose expectation value bounces, avoiding the classical Big Bang singularity.