A Small Cosmological Constant and Backreaction of Non-Finetuned Parameters

TL;DR

This paper proposes a mechanism where backreaction effects from non-finetuned parameters in a warped geometry setup lead to an exponentially small cosmological constant, reducing the need for quantum fine-tuning.

Contribution

It introduces a classical fine-tuning approach in a two domain-wall model to achieve a small cosmological constant, contrasting with quantum fine-tuning in standard field theories.

Findings

Backreaction induces an exponentially small $\

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Abstract

We include the backreaction on the warped geometry induced by non-finetuned parameters in a two domain-wall set-up to obtain an exponentially small Cosmological Constant $\Lambda_4$. The mechanism to suppress the Cosmological Constant involves one classical fine-tuning as compared to an infinity of finetunings at the quantum level in standard D=4 field theory.