Tootfinder

Optical images of the Kerr-Sen black hole and thin accretion disk
Pei Wang, Sen Guo, Li-Fang Li, Zhan-Feng Mai, Bo-Feng Wu, Wen-Hao Deng, Qing-Quan Jiang
https://arxiv.org/abs/2507.17217

Optical images of the Kerr-Sen black hole and thin accretion disk
This paper investigates the observable properties of a Kerr-Sen black hole surrounded by a thin accretion disk, focusing on the impact of the black hole's spin and charge on the image. Using ray-tracing techniques, we conduct a detailed analysis of the black hole's image, redshift distribution, and intensity distributions at different observation frequencies. The results demonstrate that spin has a more significant effect on the distortion of the inner shadow than charge, and the observer's inc…

Visualising relativistic effects in redshift space distortions of large scale structure
Pritha Paul, Chris Clarkson
https://arxiv.org/abs/2508.03249 https://

Visualising relativistic effects in redshift space distortions of large scale structure
Observing large scale structure in redshift space gives rise to the well known redshift space distortions whereby a spherical distribution of galaxies is distorted into an ellipsoid along the line of sight of the observer. This effect is important on linear scales and so can be thought of as a Newtonian correction to the density perturbation even though their physical origin is in the Doppler effect. On larger scales subtler aspects of the Doppler and gravitational redshift effects give rise to…