What does general relativity say about gravity?
What does general relativity say about gravity?
GETTING A GRIP ON GRAVITY Einstein’s general theory of relativity explains gravity as a distortion of space (or more precisely, spacetime) caused by the presence of matter or energy. A massive object generates a gravitational field by warping the geometry of the surrounding spacetime.
Does relativity disprove gravity?
“We can absolutely rule out Newton’s law of gravity. Our observations are consistent with Einstein’s theory of general relativity. Einstein’s 1915 theory of general relativity holds that what we perceive as the force of gravity arises from the curvature of space and time.
How does general relativity predict black holes?
The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of no escape is called the event horizon. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe directly.
What replaced general relativity?
Alternatives to general relativity are physical theories that attempt to describe the phenomenon of gravitation in competition to Einstein’s theory of general relativity. Other theories which do attempt to construct a theory using the principles of quantum mechanics are known as theories of quantized gravity.
Why is general relativity wrong?
Reasons for criticism of the theory of relativity have included alternative theories, rejection of the abstract-mathematical method, and alleged errors of the theory. According to some authors, antisemitic objections to Einstein’s Jewish heritage also occasionally played a role in these objections.
How difficult is general relativity?
While relativity has a reputation for being intimidatingly difficult, it’s a peculiar kind of difficulty. Coming at the subject without any preparation, you hear all kinds of crazy things about time dilating and space stretching, and it seems all very recondite and baffling.
What is the essence of the theory of general relativity?
General relativity is the theory of space and time and gravity. The essence of the theory is simple: gravity is geometry. The e\ects that we attribute to the force of gravity are due to the bending and warping of spacetime, from falling cats, to orbiting spinning planets, to the motion of the cosmos on the grandest scale.
Which is the best book for general relativity?
Steven Weinberg, \\Gravitation and Cosmology” The go-to relativity book for particle physicists. Misner, Thorne and Wheeler, \\Gravitation” Extraordinary and ridiculous in equal measure, this book covers an insane amount of material but with genuinely excellent explanations.
What is the essence of the theory of gravity?
The essence of the theory is simple: gravity is geometry. The e\ects that we attribute to the force of gravity are due to the bending and warping of spacetime, from falling cats, to orbiting spinning planets, to the motion of the cosmos on the grandest scale. The purpose of these lectures is to explain this.
Is there a good theory of quantum gravity?
Quantum gravity is the theory that deals with particle exchange of gravitons as the mechanism for the force, and with extreme conditions where quantum mechanics and general relativity must both be used. A good theory of quantum gravity does not yet exist, but one will be needed to understand how all four forces may be unified.
