Contrary to some "Afro-Centric" educators, Egypt is darker skinned and has more sub-Saharan ancestry (as confirmed by modern and ancient DNA) now than it did in the classical era and in earlier times.
What happened?
A lot of sub-Saharan Africans were forced into slavery and delivered to the Middle East and North Africa (including Egypt) during the Middle Ages.
2 comments:
A MOND model applied to the rotation curve of galaxies
Authors: Ana C. M. Ciqueira, Geanderson A. Carvalho, Paulo H. Faccin, FabrÃcio T. Dalmolin
Abstract: In this work, we propose a modified Newton dynamics (MOND) model to study the rotation curves of galaxies. The model is described by an arctangent interpolating function and it fits the rotation curves of several galaxies without invoking the presence of dark matter. We took from the literature the rotation curve data of fifteen spiral galaxies, and used it to constrain the model parameter, a0, as around 5×10−10 m/s2. This parameter is also called the acceleration constant once it gives the acceleration scale where Newton's dynamics fails. The model can be further tested in different astrophysical scenarios, such as, the missing mass problem of galaxy clusters and the accelerated expansion of the Universe, thus leading to a more robust and well constrained model. △ Less
Submitted 27 February, 2025; originally announced February 2025.
Comments: published in IJMPD
Journal ref: International Journal of Modern Physics D (2025) 2550001
Deur is reference
Saw it. Surprised that it was significant enough to publish. Nothing in it breaks any new ground.
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