Effective Dynamics of Inflationary End-of-the-World Branes in AdS3
Abstract
We develop an effective description of a two-dimensional cosmological end-of-the-world brane embedded in AdS3, with a scalar field localized on the brane. Integrating out bulk degrees of freedom, especially in the small-gradient regime, the effective action reduces to a Liouville-like theory coupled to the brane scalar. We then construct brane trajectories whose induced geometry realizes slow-roll inflation and reconstruct the associated scalar profile and potential. We also study regular Euclidean brane geometries that admit a smooth continuation to Lorentzian de Sitter and inflationary universes, and evaluate the semiclassical on-shell action for the de Sitter solution. Finally, we analyze linearized inhomogeneous perturbations and find no exponentially growing mode within the regime of validity of the approximation.
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BibTeX
@misc{fujiki2026effective,
title = {{Effective Dynamics of Inflationary End-of-the-World Branes in AdS$_3$}},
author = {Kosei Fujiki and Michitaka Kohara and Jason Kristiano and Yu-ki Suzuki and Tadashi Takayanagi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.11643},
eprint = {2609.11643},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.11643},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Effective Dynamics of Inflationary End-of-the-World Branes in AdS_3
AU - Kosei Fujiki
AU - Michitaka Kohara
AU - Jason Kristiano
AU - Yu-ki Suzuki
AU - Tadashi Takayanagi
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.11643
UR - https://arxiv.org/abs/2609.11643
AB - We develop an effective description of a two-dimensional cosmological end-of-the-world brane embedded in AdS_3, with a scalar field localized on the brane. Integrating out bulk degrees of freedom, especially in the small-gradient regime, the effective action reduces to a Liouville-like theory coupled to the brane scalar. We then construct brane trajectories whose induced geometry realizes slow-roll inflation and reconstruct the associated scalar profile and potential. We also study regular Euclidean brane geometries that admit a smooth continuation to Lorentzian de Sitter and inflationary universes, and evaluate the semiclassical on-shell action for the de Sitter solution. Finally, we analyze linearized inhomogeneous perturbations and find no exponentially growing mode within the regime of validity of the approximation.
ER -