TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.14.4.061
TI  - Cost of holographic path integrals
PY  - 2023/04/05
UR  - https://scipost.org/SciPostPhys.14.4.061
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 14
IS  - 4
SP  - 061
A1  - Chandra, A. Ramesh
AU  - de Boer, Jan
AU  - Flory, Mario
AU  - Heller, Michal P.
AU  - Hörtner, Sergio
AU  - Rolph, Andrew
AB  - We consider proposals for the cost of holographic path integrals. Gravitational path integrals within finite radial cutoff surfaces have a precise map to path integrals in $T\overline{T}$ deformed holographic CFTs. In Nielsen's geometric formulation cost is the length of a not-necessarily-geodesic path in a metric space of operators. Our cost proposals differ from holographic state complexity proposals in that (1) the boundary dual is cost, a quantity that can be 'optimised' to state complexity, (2) the set of proposals is large: all functions on all bulk subregions of any co-dimension which satisfy the physical properties of cost, and (3) the proposals are by construction UV-finite. The optimal path integral that prepares a given state is that with minimal cost, and cost proposals which reduce to the CV and CV2.0 complexity conjectures when the path integral is optimised are found, while bounded cost proposals based on gravitational action are not found. Related to our analysis of gravitational action-based proposals, we study bulk hypersurfaces with a constant intrinsic curvature of a specific value and give a Lorentzian version of the Gauss-Bonnet theorem valid in the presence of conical singularities.
ER  -

@Article{10.21468/SciPostPhys.14.4.061,
	title={{Cost of holographic path integrals}},
	author={Ammanamanchi Ramesh Chandra and Jan de Boer and Mario Flory and Michal P. Heller and Sergio Hörtner and Andrew Rolph},
	journal={SciPost Phys.},
	volume={14},
	pages={061},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.14.4.061},
	url={https://scipost.org/10.21468/SciPostPhys.14.4.061},
}