“The suggestion was that a positive energy proof for general relativity could be gotten by restricting supergravity to its bosonic sector, which is general relativity.”

— Lee Smolin

"Positive energy in quantum gravity" arXiv (Jun 10, 2014)

Adopted from Wikiquote. Last update June 3, 2021. History

Help us to complete the source, original and additional information

Do you have more details about the quote "The suggestion was that a positive energy proof for general relativity could be gotten by restricting supergravity to i…" by Lee Smolin?

Lee Smolin 52

American cosmologist 1955

Related quotes

“Some of the effects predicted by the theory [of loop quantum gravity] appear to be in conflict with one of the principles of Einstein's special theory of relativity… that the speed of light is a universal constant. …Photons of higher energy travel slightly slower than low-energy photons. …the principle of [general] relativity is preserved but Einstein's special theory of relativity requires modification. …A photon can have an energy-dependent speed without violating the principle of [general] relativity!”

Lee Smolin (1955) American cosmologist

"Loop Quantum Gravity," The New Humanists: Science at the Edge (2003)

“One of the evident facts about the world is the stability of empty space-time. In classical general relativity we can explain this as a consequence of the positive energy theorem… the positive energy theorem must extend in some suitable form to any viable quantum theory of gravity.”

Lee Smolin (1955) American cosmologist

"Positive energy in quantum gravity" arXiv (Jun 10, 2014)

“It is absurd in general relativity to speak of a universe in which nothing happens.”

Lee Smolin book Three Roads to Quantum Gravity

Three Roads to Quantum Gravity (2000)

“General relativity has changed our understanding of space and time. ...The spacetime of general relativity ...is likely to be just a classical approximation that loses its meaning in the quantum theory, for the same reason the trajectory of a particle does.”

Carlo Rovelli (1956) Italian physicist

"Forget time" (Aug, 2008)

“Each generation must discover its mission, fulfill it or betray it, in relative opacity.”

Frantz Fanon book The Wretched of the Earth

Variant: Each generation must, out of relative obscurity, discover its mission, fulfill it, or betray it.
Source: The Wretched of the Earth

“The miracle of physics that I'm talking about here is something that was actually known since the time of Einstein's general relativity; that gravity is not always attractive. Gravity can act repulsively. Einstein introduced this in 1916… in the form of the cosmological constant, and the original motivation of modifying the equations of general relativity to allow this was because Einstein thought that the universe was static, and he realized that ordinary gravity would cause the universe to collapse if it was static. …The fact that general relativity can support this gravitational repulsion, still being consistent with all the principles that general relativity incorporates, is the important thing which Einstein himself did discover..”

Alan Guth (1947) American theoretical physicist and cosmologist

Lecture 1: Inflationary Cosmology: Is Our Universe Part of a Multiverse? Part I.
The Early Universe (2012)

“General relativity is certainly a very beautiful theory, but how does one judge the elegance of physical theories generally?”

Roger Penrose book Fashion, Faith, and Fantasy in the New Physics of the Universe

Ch. 1, Mathematical Elegance as a Driving Force, p. 7 https://books.google.com/books?id=T09kCwAAQBAJ&pg=PA7.
Fashion, Faith, and Fantasy in the New Physics of the Universe (2016)

“The problem with general relativity is that the principles are pretty simple and the computations are always ugly.”

Leonard Susskind (1940) American physicist

General Relativity Lecture 5, YouTube, published 30 October 2012 https://www.youtube.com/watch?v=quWN1V9jOf0 (quote at 1:21:46 of 1:39:06)

“It is almost impossible to have a baseless snobbish opinion of the General Theory of Relativity.”

Michael Moorcock (1939) English writer, editor, critic

Fantastic Metropolis, Christmas Editorial (http://www.fantasticmetropolis.com/i/20011209/3/)

“I do not see any reason to assume that the heuristic significance of the principle of general relativity is restricted to gravitation and that the rest of physics can be dealt with separately on the basis of special relativity, with the hope that later on the whole may be fitted consistently into a general relativistic scheme. I do not think that such an attitude, although historically understandable, can be objectively justified. The comparative smallness of what we know today as gravitational effects is not a conclusive reason for ignoring the principle of general relativity in theoretical investigations of a fundamental character. In other words, I do not believe that it is justifiable to ask: What would physics look like without gravitation?”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

1950s, On the Generalized Theory of Gravitation (1950)

“The suggestion was that a positive energy proof for general relativity could be gotten by restricting supergravity to its bosonic sector, which is general relativity.”

Help us to complete the source, original and additional information

Lee Smolin 52

Related quotes

Related topics