Tag: Perturbation (astronomy)
Periodic solutions may continue under small electromagnetic perturbations
What the study found The paper shows that non-circular periodic solutions of an unperturbed central force problem may be continued to periodic solutions when small electromagnetic perturbations are introduced. The authors consider both fixed-period problems and, when the perturbation does not depend on time, fixed-energy problems. Why the authors say this matters The authors state…
Non-Gaussian redshift-space Minkowski tensors show qualified perturbation-theory success
What the study found The study found that perturbation-theory predictions for Minkowski tensors in redshift space are a qualified success when compared with dark matter simulation measurements. It also found that nonperturbative Finger-of-God effects remain significant at relatively large scales, especially in components parallel to the line of sight. Why the authors say this matters…