条街道往前推
发表于 2025-3-25 04:29:35
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Proponent
发表于 2025-3-25 10:42:00
Minkowski Geometry,erval, which physically is just the time measured by a free particle travelling between the two events, is very different from the Euclidean distance: the length of one side of a triangle is always larger than the sum of the lengths of the other two (twin paradox), and lines are the curves with maximum length (generalized twin paradox).
他姓手中拿着
发表于 2025-3-25 13:15:54
Cosmology,sequences of the Einstein equation, which in the FLRW models reduces to the Friedmann equations for the density and radius of the Universe. We see how these equations imply that the Universe originated in a Big Bang, and will, according to the currently accepted cosmological parameters, expand forever.
外观
发表于 2025-3-25 17:47:31
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托人看管
发表于 2025-3-25 23:16:04
Gravity,he gravitational field of a spherically symmetric body, and explain how these equations determine the motion given initial conditions. As an example, we compute the speed of a circular orbit, and use it to estimate the conditions under which we should expect relativistic corrections to Newtonian gravity.
Neuralgia
发表于 2025-3-26 00:29:27
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休息
发表于 2025-3-26 05:26:44
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Albinism
发表于 2025-3-26 11:31:47
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Promotion
发表于 2025-3-26 16:41:53
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dermatomyositis
发表于 2025-3-26 18:15:44
General Relativity,e observation that curved space–time is locally flat, and implies that free-falling particles must move along geodesics (and light rays along null geodesics) just like in flat Minkowski space–time. Given the matter distribution, the space–time metric can be found by solving the Einstein equation, whose nature we describe.