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Before Newton's law of gravity, there were many theories explaining gravity. Philoshophers made observations about things falling down − and developed theories why they do – as early as Aristotle who thought that rocks fall to the ground because seeking the ground was an essential part of their nature. [6]
Neil deGrasse Tyson (US: / d ə ˈ ɡ r æ s / də-GRASS or UK: / d ə ˈ ɡ r ɑː s / də-GRAHSS; born October 5, 1958) is an American astrophysicist, author, and science communicator. Tyson studied at Harvard University, the University of Texas at Austin, and Columbia University. From 1991 to 1994, he was a postdoctoral research associate at ...
To describe the coupling between gravity and particles of arbitrary spin, it is useful to use the vielbein formalism of general relativity. [4] This replaces the metric by a set of vector fields e a = e a μ ∂ μ {\displaystyle e_{a}=e_{a}^{\mu }\partial _{\mu }} indexed by flat indices a {\displaystyle a} such that
The Ramond–Ramond fields are sourced by odd-dimensional D(2k + 1)-branes, which host supersymmetric U(1) gauge theories. As in IIA supergravity, the fundamental string is an electric source for the Kalb–Ramond B-field and the NS5-brane is a magnetic source.
In general relativity, the metric tensor (in this context often abbreviated to simply the metric) is the fundamental object of study.The metric captures all the geometric and causal structure of spacetime, being used to define notions such as time, distance, volume, curvature, angle, and separation of the future and the past.
Space is about to get more crowded for Elon Musk. The billionaire's Starlink communications network is facing increasingly stiff challenges to its dominance of high-speed satellite internet ...
Le Sage's theory of gravitation is a kinetic theory of gravity originally proposed by Nicolas Fatio de Duillier in 1690 and later by Georges-Louis Le Sage in 1748. The theory proposed a mechanical explanation for Newton's gravitational force in terms of streams of tiny unseen particles (which Le Sage called ultra-mundane corpuscles) impacting all material objects from all directions.
Arizona men's basketball and BYU found themselves in a tightly-knit, tense game Saturday at the McKale Center, as the two Big 12 opponents fought for March Madness seedings. The tensions escalated ...