Occam's razor is one of the most useful tools for logic and problem solving ever devised: When examining competing hypotheses to explain phenomena, the one with the fewest assumptions should be selected. Simpler is better. But according to astrophysicist and educator Ethan Siegelthis modus operandi does not often suit the complicated world of physics. I know you hear about 'Occam's Atomism - Occams Laser - A-Sides (File) all the time, but physicists don't actually resort to that very often, especially in matters where it's rooted in opinion," he told RCS.
The impetus for this discussion was a nagging question about the nature of the universe. The theory of dark matter has provided an immensely successful framework to explain a host of astronomical observations. In fact, it explains things so well that even though astronomers have never actually seen the stuff, many just assume it's there.
Modified Newtonian Dynamics MONDfor example, reproduces observed galactic rotation curves even better than dark matter! Rather than theorize into existence a bunch of unseen matter, all MOND does is slightly tweak general relativity.
When these When Doves Cry - Various - Funk Club - Sensational Funk Grooves are applied, dark matter clearly outshines MOND. As Siegel explained in a previous blog post :. There's the gravitational bending of starlight by mass, including strong and weak Atomism - Occams Laser - A-Sides (File) lensing.
There's the Shapiro time delay. There's gravitational time dilation and gravitational redshift. There's the framework of the Big Bang and the concept of the expanding Universe. There are the motions of galaxies within clusters and of the clustering of galaxies themselves on the largest scales. The universe is grand in scale and in complexity. Occam's razor is useful here on Earth, but it's too small to shave a universe.
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This map of dark matter in the universe rendered in pink reveals a web of dense light and empty dark regions. This image is one out Atomism - Occams Laser - A-Sides (File) five patches of the sky observed by KiDS.
But Look At Myself - Various - World Of Ass cautions against such an approach. As Siegel explained in a previous blog post : There's the gravitational bending of starlight by mass, including strong and weak gravitational lensing. As outlandish as dark matter may seem on face value, it outperforms the much simpler MOND.
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