General Relativity Quotes (12 quotes)
A duel of theories: quantum mechanics, general relativity — or both?
Quantum gravity QG is a field of theoretical physics that seeks to describe gravity according to the principles of quantum mechanics , and where quantum effects cannot be ignored,  such as near compact astrophysical objects where the effects of gravity are strong. The current understanding of gravity is based on Albert Einstein 's general theory of relativity , which is formulated within the framework of classical physics. On the other hand, the other three fundamental forces of physics are described within the framework of quantum mechanics and quantum field theory , radically different formalisms for describing physical phenomena. While a quantum theory of gravity may be needed to reconcile general relativity with the principles of quantum mechanics, difficulties arise when applying the usual prescriptions of quantum field theory to the force of gravity via graviton bosons. As a result, theorists have taken up more radical approaches to the problem of quantum gravity, the most popular approaches being string theory and loop quantum gravity.
As far as I know quantum physics and relativity theory will never get along. Does that mean one of them is basically wrong? Answer by Viktor T. Toth , IT pro, part-time physicist, on Quora :. Quantum physics and relativity theory get along just fine in most respects.
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Talks by researchers during Science Rendezvous festival illuminate theories of physics. By Rojan Shaeri. By Rojan Shaeri Published: pm, 1 June Quantum mechanics, on the other hand, is the physics relating to extremely small particles. From the Department of Physics, Professor A. Peet and post-doctoral fellow Aharon Brodutch delivered two related yet different talks about crucial theories of physics to a wide range of attendees of the May 11 Science Rendezvous street festival on the St.
I t is the biggest of problems, it is the smallest of problems. At present physicists have two separate rulebooks explaining how nature works. There is general relativity , which beautifully accounts for gravity and all of the things it dominates: orbiting planets, colliding galaxies, the dynamics of the expanding universe as a whole. Then there is quantum mechanics , which handles the other three forces — electromagnetism and the two nuclear forces. Quantum theory is extremely adept at describing what happens when a uranium atom decays, or when individual particles of light hit a solar cell. Now for the problem: relativity and quantum mechanics are fundamentally different theories that have different formulations.
Despite our successes at describing the inner workings of the universe Higgs, anyone? Why should we want to unify them anyway? In this week's " Ask a Physicist, " we'll find out. Virtually everything we know about the laws of physics falls into one of two piles. In one, there's quantum mechanics, from which we've developed the " Standard Model, " including all of the fundamental particles we've yet detected, and three of the four interactions: electromagnetism, and the weak and strong nuclear forces. In the other pile, there's Einstein's theory of General Relativity, which describes the fourth force, gravity, and gives us black holes , the expansion of the universe , and the potential for time travel.