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sciboudy
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what is the difference between general theory and special theory of relativity ?
sciboudy said:so general theory discuses the relation between space time and gravity
and special discuses the space time relation
so G theory more difficult than special
so i will focus special
atyy said:The general theory simply says spacetime is gravity. Since mass generates gravity, gravity is changed by moving masses, which means that spacetime is curved.
Yes, it's good to start with the special theory. There spacetime is flat and unchanging, since there is no gravity.
sciboudy said:before i start in spatial Explain how mass generates gravity ? how are you Concluded that mean
spacetime curved by moving masses?
atyy said:Gravity is the force of attraction between masses. We think of a mass generating the gravitational field, which acts on another mass, attracting it to the first mass.
Now, what do we mean by spacetime? We mean something that we measure by rulers and clocks. If our ruler has mass, it will be attracted by other masses, and will be bent, so spacetime will appear curved in the presence of gravity.
sciboudy said:good i think i will begin by special theory ? although i think general theory is more interesting
sciboudy said:i heard that michlson experiment helps Einstien to begin in the theory of special
what is this Experiment ? and HOw it helped him ?
bcrowell said:This is the stage where you really want to get a book. You're not going to be able to learn SR by asking people questions on web forums. Some special relativity books that I like are (from easiest to hardest):
Takeuchi, An Illustrated Guide to Relativity
Mermin, It's About Time: Understanding Einstein's Relativity
Taylor and Wheeler, Spacetime Physics
bcrowell said:This is the stage where you really want to get a book. You're not going to be able to learn SR by asking people questions on web forums. Some special relativity books that I like are (from easiest to hardest):
Takeuchi, An Illustrated Guide to Relativity
Mermin, It's About Time: Understanding Einstein's Relativity
Taylor and Wheeler, Spacetime Physics
sciboudy said:and I love discuses with people now i thin k they will help me ..
phinds said:I suggest that you look up the books Ben listed on-line (Amazon will probably have reviews of them) and see if one of them would be right for your level of understanding of math. Doing that will lead you to other titles that you might want to explore to see if they are right for you.
thank you very much very good websatyy said:Usually, I need many, many books, since one book will explain somethings well and other things not so well (at least for my background). So it's good to buy maybe one or two cheap books, but otherwise visit a good library, or have some free stuff on the web to download, otherwise it'll be pretty expensive. Here are some things from the web, ordered roughly according to difficulty, though there's no reason not to jump around and cross-check that they all say the same thing. Tatsu Tekeuchi's and Michael Fowler's materials are probably the ones to sit down with and work through carefully.
Nabeshin said:Just for completeness, it doesn't look like anyone actually defined the term Lorentzian (in reference to a manifold) for you? Essentially, it means that the metric has a signature (- + + +) or (+ - - -) if you like. The crucial point is that it is a (3,1) spacetime, as opposed to something like (- - + +) or (+ + - -) which would be a (2,2) spacetime. When we break the space/time symmetry, we can identify a (3,1) spacetime by saying there are 3 spatial dimensions and 1 time dimension, which is, for practicality, the definition of a Lorentzian spacetime. In contrast, a (2,2) spacetime would have two time-like dimensions and two space-like dimensions.
The special theory of relativity, proposed by Albert Einstein in 1905, is a theory that describes the relationship between space and time for objects moving at constant speeds. It is based on two postulates: the laws of physics are the same for all observers in uniform motion, and the speed of light is constant for all observers regardless of their relative motion. On the other hand, the general theory of relativity, proposed by Einstein in 1915, is a more comprehensive theory that explains the effects of gravity on the structure of space and time. It expands on the principles of the special theory to include non-uniform motion and acceleration.
The special theory of relativity does not account for the effects of gravity, while the general theory explains gravity as the curvature of space-time caused by the presence of mass and energy. In the special theory, gravity is treated as a fictitious force, while in the general theory it is a fundamental property of space and time.
The general theory of relativity is more widely applicable in real-world scenarios as it can account for gravity and non-uniform motion, while the special theory is limited to objects moving at constant speeds in a straight line.
The special theory of relativity revolutionized our understanding of space and time, challenging the Newtonian concepts of absolute space and time. The general theory expanded on this by providing a framework for understanding the effects of gravity and the behavior of massive objects on the structure of space-time. Both theories have had a significant impact on our understanding of the universe and have been validated through numerous experiments and observations.
Theories of relativity have been widely accepted and confirmed through experiments and observations, but there are still some ongoing debates and controversies. For example, there are ongoing discussions about the exact nature of gravity and its relationship to other fundamental forces, and attempts to reconcile the theories of relativity with quantum mechanics. Additionally, some scientists are exploring alternative theories of gravity that could potentially challenge the principles of special and general relativity.