Fundamental constants | Physical constants
The term physical constant expresses the notion of a physical quantity subject to experimental measurement which is independent of the time or location of the experiment. The constancy (immutability) of any "physical constant" is thus subject to experimental verification. Paul Dirac in 1937 speculated that physical constants such as the gravitational constant or the fine-structure constant might be subject to change over time in proportion of the age of the universe.Experiments conducted since then have put upper bounds on their time-dependence. This concerns the fine-structure constant, the gravitational constant and the proton-to-electron mass ratio specifically, for all of which there are ongoing efforts to improve tests on their time-dependence. The immutability of these fundamental constants is an important cornerstone of the laws of physics as currently known; the postulate of the time-independence of physical laws is tied to that of the conservation of energy (Noether theorem), so that the discovery of any variation would imply the discovery of a previously unknown law of force. In a more philosophical context, the conclusion that these quantities are constant raises the question of why they have the specific value they do in what appears to be a "fine-tuned universe", while their being variable would mean that their known values are merely an accident of the current time at which we happen to measure them. (Wikipedia).
Teach Astronomy - Fundamental Constants
http://www.teachastronomy.com/ There are several important fundamental constants of nature in astronomy. The first is the speed of light; 3*109 meters per second, or 300 thousand kilometers per second, or 186 thousand miles per second. A huge number, this reflects the fact that light and
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Huw Price - Is Time Fundamental?
Click here for more video interviews about whether time is fundamental http://bit.ly/1emCR64 Click here for more interviews with Huw Price http://bit.ly/1GRsoGD To buy episodes and seasons of Closer To Truth click here http://bit.ly/1LUPlQS For more video interviews please visit us at w
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Time-Independent Schrödinger Equation | Quantum Mechanics
In this video, we will talk about the time-independent Schrödinger equation in quantum mechanics. If we start with the time-dependent Schrödinger equation, we can get to the time-independent one by performing a separation of variables on the wave function, where we claim that the time depe
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Are the Fundamental Constants Changing?
Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE Recent findings suggest that the fundamental constants might not be as stable as we assumed. And be sure to signup for your free trial of The Great Courses Plus at htt
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