Comment on "Braneworld Effective Field Theories -- Holography, Consistency and Conformal Effects"

TL;DR

This paper critically reviews arguments against strict brane localization in effective models, proposing loopholes and discussing the role of form factors in UV-completion to better understand the Swampland constraints.

Contribution

It challenges previous claims by identifying potential loopholes and emphasizing the importance of effective form factors in braneworld models.

Findings

Loopholes in the argument against strict brane localization.

The significance of form factors in UV-completion.

Critical assessment of Swampland criteria for braneworlds.

Abstract

Several arguments given in arXiv:1912.12316 suggest that braneworld effective models with fields strictly localized on $\delta$-like branes cannot be UV-completed by a fundamental theory including gravity, i.e. they belong to the Swampland. It is concluded that one should instead only consider models with quasilocalized zero-modes of higher-dimensional fields. In this comment, the arguments are critically reviewed, and various loopholes are proposed. Beyond that, the main point that is discussed is the notion of effective brane form factors, which are required when the singular behavior of the branes is softened in the UV-completion.