Natural solution to the naturalness problem -- Universe does fine-tuning
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana

TL;DR
This paper introduces a novel mechanism involving multi-local actions and a parameter integral to naturally explain fine-tuning issues like the cosmological constant, strong CP problem, and multiple point criticality, unifying these phenomena under one framework.
Contribution
The paper proposes a new dynamical tuning mechanism using multi-local actions and parameter integrals to address several fine-tuning problems simultaneously.
Findings
Demonstrates the mechanism's applicability to the strong CP problem.
Explains the multiple point criticality principle.
Provides a unified approach to the cosmological constant problem.
Abstract
We propose a new mechanism to solve the fine-tuning problem. We start from a multi-local action , where 's are ordinary local actions. Then, the partition function of this system is given by \begin{equation} Z=\int d\overrightarrow{\lambda} f(\overrightarrow{\lambda})\langle f|T\exp\left(-i\int_{0}^{+\infty}dt\hat{H}(\overrightarrow{\lambda};a_{cl}(t))\right)|i\rangle,\nonumber\end{equation} where represents the parameters of the system whose Hamiltonian is given by , is the radius of the universe determined by the Friedman equation, and , which is determined by , is a smooth function of . If a value of ,…
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