Vision transformer models segment proto-halo regions in initial cosmological density fields by final mass at z=0, outperforming both CNNs and the PINOCCHIO perturbation-theory code.
Cosmic Shear from Galaxy Spins
2 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We discuss the origin of galactic angular momentum, and the statistics of the present day spin distribution. It is expected that the galaxy spin axes are correlated with the intermediate principal axis of the gravitational shear tensor. This allows one to reconstruct the shear field and thereby the full gravitational potential from the observed galaxy spin fields. We use the direction of the angular momentum vector without any information of its magnitude, which requires a measurement of the position angle and inclination on the sky of each disk galaxy. We present the maximum likelihood shear inversion procedure, which involves a constrained linear minimization. The theory is tested against numerical simulations. We find the correlation strength of nonlinear structures with the initial shear field, and show that accurate large scale density reconstructions are possible at the expected noise level.
fields
astro-ph.CO 2representative citing papers
A closed-form Shannon entropy for the tidal-eigenvalue distribution of the cosmic web is derived, but the advertised growth-rate probe is the standard σ8D growth estimator in new notation.
citing papers explorer
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Segmenting proto-halos with vision transformers
Vision transformer models segment proto-halo regions in initial cosmological density fields by final mass at z=0, outperforming both CNNs and the PINOCCHIO perturbation-theory code.
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Information Content of the Cosmic Web
A closed-form Shannon entropy for the tidal-eigenvalue distribution of the cosmic web is derived, but the advertised growth-rate probe is the standard σ8D growth estimator in new notation.