Cosmological "constant" in a universe born in the metastable false vacuum state
Krzysztof Urbanowski

TL;DR
This paper investigates how the energy of a quantum system in a metastable vacuum state evolves over time, suggesting that the cosmological constant could start very large and then rapidly decrease due to quantum decay processes.
Contribution
It introduces a quantum decay mechanism that explains the dynamic evolution of the cosmological constant from large initial values to very small ones.
Findings
Energy in metastable states decreases rapidly after initial decay
The cosmological constant can be initially large and then diminish over time
Quantum decay processes can explain the small observed value of Λ today
Abstract
The cosmological constant is a measure of the energy density of the vacuum. Therefore properties of the energy of the system in the metastable vacuum state reflect properties of . We analyze properties of the energy, , of a general quantum system in the metastable state in various phases of the decay process: In the exponential phase, in the transition phase between the exponential decay and the later phase, where decay law as a function of time is in the form of powers of , and also in this last phase. We found that this energy having an approximate value resulting from the Weisskopf--Wigner theory in the exponential decay phase is reduced very fast in the transition phase to its asymptotic value in the late last phase of the decay process. (Here is the minimal energy of the…
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