The standard answer to that question in GR is that the source of gravity is the stress-energy tensor, the thing that appears on the RHS of the Einstein Field Equation. So anything that appears in the stress-energy tensor is a source of gravity. That seems to lead to a clear, simple “...
… [We no longer] expect that the strong, weak and electromagnetic interactions can be understood in geometrical terms, and too great an emphasis on geometry can only obscure the deep connections between gravitation and the rest of physics. … In place of Riemannian geometry, I have based the...
摘要: We review some results concerning bigravity and multigravity. Bigravity was considered for the first time by Isham, Salam and Strathdee almost 40 years ago. We update some results and in particular consider the three-dimensional version which has some interesting features....
This series of lectures gives a simple and self-contained introduction to the non-perturbative and background independent loop approach of canonical quantum gravity. The Hilbert space of kinematical quantum states is constructed and a co... M Gaul,C Rovelli - 《Lecture Notes in Physics》 被引量...
gravity: is used for simple views like textview, edittext etc. layout_gravity: is used for current view only gravity in context of it's relative parent view like linear Layout or FrameLayout to make view in center or any other gravity of its parent. Share Improve this answer Fo...
I wanted to make simple gravity simulation in Unity, so I wrote this UnityScript (using information about gravity from wikipedia.com): var Type : String; var Mass : double; var Density : double; var Volume : double; var Surface : double; var Radius : double; var isStatic : boolean; va...
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In that case, the bigger object's mass is more spread out, so we say it has lower density, where density is how much mass is inside a given volume.在这种情况下,更大的物体的质量更分散,所以我们说它的密度更低,密度就是给定体积内的质量。In science terms, mass tells us how much an ...
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License. See also LayoutDirectionLtr LayoutDirectionRtl Applies to .NET for Android .NET for Android API 34 and ...
Urine specific gravityis a measure ofurine concentration, which is made by refractometry. The normal range in adult horses is 1.020–1.050, while foals have more dilute urine. Neonates commonly havehyposthenuric urine. In dehydration, urine output decreases and specific gravity increases. The presenc...