The Lagrangian in scalar-tensor theory can be expressed in the Jordan frame in which the scalar field or some function of it multiplies the Ricci scalar, or in the Einstein frame in which Ricci scalar is not multiplied by the scalar field. There exist various transformations between these frames. Despite the fact that these frames have been around for some time there is has been debate about whether either, both, or neither frame is a 'physical' frame which can be compared to observations and experiment. Christopher Hill and Graham Ross have shown that there exist ``gravitational contact terms" in the Jordan frame, whereby the action is modified by graviton exchange. This modification leads back to the Einstein frame as the effective theory. Contact interactions arise in Feynman diagrams when a vertex contains a power of the exchanged momentum, , which then cancels against the Feynman propagator, , leading to a point-like interaction. This must be included as part of the effective action of the theory. When the contact term is included results for amplitudes in the Jordan frame will be equivalent to those in the Einstein frame, andresults of physical calculations in the Jordan frame that omit the contact terms will generally be incorrect. This implies that the Jordan frame action is misleading, and the Einstein frame is uniquely correct for fully representing the physics. (Wikipedia).
Einstein's Theory Of Relativity Made Easy
http://facebook.com/ScienceReason ... Albert Einstein's Theory of Relativity (Chapter 1): Introduction. The theory of relativity, or simply relativity, encompasses two theories of Albert Einstein: special relativity and general relativity. However, the word "relativity" is sometimes used
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In the latest campaign to reconcile Einstein’s theory of gravity with quantum mechanics, many physicists are studying how a higher dimensional space that includes gravity arises like a hologram from a lower dimensional particle theory. Read about the second episode of the new season here:
From playlist In Theory
An introduction to the physics concept of frames of reference. The first in a series of videos on special and general relativity Let us know what you think of these videos by filling out our short survey at http://tinyurl.com/astronomy-pulsar. Thank you!
From playlist Special Relativity
Einstein’s theory of special relativity is one of the fascinating scientific advances of the 20th century. Fermilab’s Dr. Don Lincoln has decided to make a series of videos describing this amazing idea. In this video, he lays out what relativity is all about… what is the entire point. A
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An in-depth look at the ground-breaking discoveries of Albert Einstein and the implications within our physical world. (6 chapters total!)
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From playlist Physics - Special Relativity
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From playlist The Life and Work of Albert Einstein
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From playlist Relativity
Dark Energy and Modified Gravity (Lecture 2) by Alessandra Silvestri
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From playlist WSU Live Sessions
PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE ↓ More info below ↓ Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Today we’re going to delve into a couple of the most fam
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From playlist Noncommutative Geometry
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Download a free audiobook version of "A Brief History of Time" and support TED-Ed's nonprofit mission: https://adbl.co/2NWYjAh Check out our full book recommendation: https://shop.ed.ted.com/collections/ted-ed-book-recommendations/products/a-brief-history-of-time View full lesson: https:
From playlist New TED-Ed Originals
The Phantom Singularity | Space Time
Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/DonateSPACE Be sure to check out the Infinite Series episode Singularities Explained https://youtu.be/0pIRibivolA or How I Learned to Stop Worrying and Divide by Zero. Support us
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From playlist 2018 - T3 - Analytics, Inference, and Computation in Cosmology