Tootfinder

Ladder operators of the de Sitter algebra
Manizheh Botshekananfard, Elif B\"u\c{s}ra G\"uraks{\i}n, Gizem \c{S}eng\"or
https://arxiv.org/abs/2510.05735 https://…

Ladder operators of the de Sitter algebra
We identify raising and lowering operators of the de Sitter algebra with focus on their action on states in particular in 4 spacetime dimensions. There isn't a unique solution to the question of how the de Sitter ladder operators act on states. By fixing the action of certain generators one can conclude on the action of the rest. Our main aim is to be able to identify highest and lowest weight states such that we can recognize them for quantized fields on a rigid de Sitter background.

Unveiling the evolution of the CO excitation ladder through cross-correlation of CONCERTO-like experiments and galaxy redshift surveys
Mathilde Van Cuyck, Matthieu Bethermin, Guilaine Lagache, Alexandre Beelen
https://arxiv.org/abs/2510.07596

Unveiling the evolution of the CO excitation ladder through cross-correlation of CONCERTO-like experiments and galaxy redshift surveys
Context: Rotational CO transitions, while acting as a foreground for [C II] line-intensity mapping (LIM) experiments, trace the physical conditions of cold gas in galaxies at lower redshifts. Studying these transitions is also crucial for improving component-separation methods as LIM sensitivity increases. Aims: Galaxy-evolution models have so far predicted only the total CO LIM signal. We explore the potential of cross-correlating millimeter-wave LIM data with spectroscopic galaxy surveys to c…