meta user
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| bio | website | azimuthproject.org/azimuth/… |
|---|---|---|
| location | Munich, Germany | |
| age | 38 | |
| visits | member for | 2 years, 3 months |
| seen | May 28 '12 at 8:53 | |
| stats | profile views | 228 |
I'm a physics graduate working as an IT-developer and -consultant.
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Jan 27 |
comment |
Newton's Bucket Sorry, I don't understand your question. In GR we have a spacetime, it is a solution to the Einstein field equations. Any mass distribution influences this solution, therefore any mass will influence the local gravitational field and therefore will influence what the local reference frame is (unless, of course, it does not because the mass and the point we are looking at are for ever spacelike separated, for example). |
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Jan 27 |
answered | Haag's theorem and practical QFT computations |
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Jan 27 |
answered | Newton's Bucket |
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Jan 27 |
awarded | Supporter |
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Jan 27 |
comment |
Is a normal-ordered product of free fields at a point a Wightman field? Hi there, this software is unfit to host ongoing discussions, so I'll be brief: Making sense of $\phi(x) \phi(x)$ as a Wightman field would, that's my educated guess, result in the very first construction of an interacting Wightman theory. I doubt that it can be done. Products of distributions can be defined, however, under certain circumstances. Note that in the two point function for a Wightman field the product is actually a tensor product (you feed every factor one test function separately). |
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Jan 26 |
awarded | Editor |
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Jan 26 |
revised |
Is a normal-ordered product of free fields at a point a Wightman field? added 771 characters in body |
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Jan 26 |
answered | Is a normal-ordered product of free fields at a point a Wightman field? |
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Jan 26 |
comment |
Is causality a formalised concept in physics? @Nigel: No, as far as I know there is no deeper formalization of causality in physics, as Lubos already said. Maybe one could add that the time evolution of physical systems is described by hyperbolic evolution equations and that the causal relationship of events is preserved via the appropriate representations of the Poincare group, and that's it. |
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Jan 25 |
answered | Is causality a formalised concept in physics? |
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Jan 24 |
awarded | Teacher |
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Jan 24 |
answered | Why are von Neumann Algebras important in quantum physics? |
