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3 days ago · At the time it was published in the 17th century, Isaac Newton's theory of gravity was the most accurate theory of gravity. Since then, a number of alternatives were proposed. The theories which predate the formulation of general relativity in 1915 are discussed in history of gravitational theory .
3 days ago · Vitruvius (fl. 1st century BCE) understood that objects fall based on their specific gravity. In the 6th century CE, Byzantine Alexandrian scholar John Philoponus modified the Aristotelian concept of gravity with the theory of impetus.
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3 days ago · For them, a quantum theory of gravity, in which space-time would be an emergent property of more fundamental constituents of the universe, might necessarily lack the definite one-way causality of ...
1 day ago · 1959 – Robert Pound and Glen Rebka propose the Pound–Rebka experiment, first precision test of gravitational redshift. The experiment relies on the Mössbauer effect. [113] 1959 – Lluís Bel introduces Bel–Robinson tensor and the Bel decomposition of the Riemann tensor. 1959 – Arthur Komar introduces the Komar mass.
19 hours ago · During the 60s and the 70s, the field of astronomy was blooming with lots of new discoveries that could not be understood with the scientific knowledge of the time. In the search for a satisfactory explanation to the newly observed phenomena, two main hypothesis arose: the dark matter model and the modified gravity model. Given…
1 day ago · With the present paper I maintain that the group field theory (GFT) approach to quantum gravity can help us clarify and distinguish the problems of spacetime emergence from the questions about the nature of the quanta of space. I will show that the use of approximation methods can suggest a form of indifference between scales (or phases) and that such an indifference allows us to black-box ...
5 days ago · published 18 May 2024. Black hole singularities defy the laws of physics. New research presents a bold solution to this puzzle: Black holes may actually be a theoretical type of star called a...
