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propagator

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propagator
propagator (ˈprɒpəgeɪtə(r)) [a. L. prō-, propāgātor, agent-n. from prō̆pāgāre to propagate: so F. propagateur (1516 in Hatz.-Darm.).] One who or that which propagates. 1. a. One who begets or produces offspring.1686 Goad Celest. Bodies i. ix. 32 [They] must needs depend on some prime Propagator, as ... Oxford English Dictionary
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Eocarterus propagator
Eocarterus propagator is a species of ground beetle in the genus Eocarterus. References P Beetles described in 1901 wikipedia.org
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propagator
propagatorperson or thing that propagates 繁殖者; 传播者 tomato plants growing in a propagator 在繁育场中栽培的西红柿植株. 牛津英汉双解词典
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US is world's 'greatest propagator of disinformation' - Senator - RT
May 5, 2022Due to its long track record of disinformation, the US government has no right to tell the American people what the truth is, Kentucky Senator Rand Paul has stated. He went to list a number of examples of where Washington had lied to its own people, and the rest of the world. During a Senate hearing on Wednesday, Paul grilled Secretary of ...
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Diffuson
In condensed matter physics, the diffuson is a disorder-averaged electron-hole propagator, a mathematical object which often appears in the theory of disordered The poles of the propagator can be identified with diffusion modes. wikipedia.org
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Heat kernel property We define the heat propagator on a Riemannian manifold $M$: $$e^{-t \Delta_g}: L^2(M) \rightarrow L^2(M)$$ $$e^{-t \Delta_g} f(x) = \int_M p(x,y,t) f(y) \,dV(y)$$ where $p(x,y,t)$ is the fundam...
Actually you should have $$e^{-t \Delta_g} \circ e^{-s\Delta_g} f(x) = \int_M p(x,y,t) (e^{-s\Delta_g} f)(y) \,dV(y)$$ $$ = \int_M p(x, y, t)\bigg( \int_M p(y, z, s) f(z) dV(z) \bigg)dV(y)$$ $$ = \int_M \bigg( \int_M p(x, y, t) p(y, z, s)dV(y)\bigg) f(z) dV(z) .$$ From here I think you will know how...
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Mass gap
In the same limit, the propagator for a massless particle is singular. In this case we have immediately the propagator just setting in the formulas above. wikipedia.org
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Time derivative of operator I have to compute, at least formally, the following derivative $$\partial_t \exp(it\Delta)f(x-ct)$$ where $\Delta$ is the Laplacian and $c$ is a constant. I know that $e^{it\Delta}$ is the ...
Since the laplacian is a linear differential operator it can be differentiated like any other linear operator. The way the differential works is the same way as for the product of functions : Let $D(t)$ be a linear differential operator then $$D(t+\epsilon)f(x,t+\epsilon)-D(t)f(x,t)=$$$$D(t+\epsilon...
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Pole mass
Propagator pole A loop in a Feynman diagram requires an integral over a continuum of possible energies and momenta. In general, the integrals of products of Feynman propagators diverge at propagator poles, and the divergences must be removed by renormalization. wikipedia.org
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Infinite derivative gravity
The effect of IDG on black holes and the propagator was examined by Modesto. The propagator around a flat space background was obtained in 2013. wikipedia.org
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Functional derivative of generating function QFT I am reading Srednicki book for QFT. In page 69 they realize a functional derivative of the following function: $$ Z[J]= \exp\left(\frac{i}{2}\int d^4xd^4x'J(x)\Delta(x...
**HINT** In these situations, it's usually helpful to try to translate it into a discrete context and see if you can make sense of it there. For instance, let $$ Z(J) = \exp\left(\frac{i}{2} \sum_{i,j}J_i \Delta_{ij}J_j\right).$$ Can you see that $$\frac{\partial}{\partial J_k}Z(J) = i Z(J) \sum_j\D...
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On shell renormalization scheme
Photon propagator Just like what has been done with the fermion propagator, the form of the photon propagator inspired by the free photon field will be compared to the photon propagator calculated up to a certain order in in the interacting theory. wikipedia.org
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SICP 推崇的Wishful thinking在编程中如何应用？
propagator归根到底就是两个东东 - 一个‘知识’，跟变得更‘聪明’的时候，应该采取的计算。 ，但这是因为propagator被staged了 - 在每次程序运行的时候都重新根据控制流走向生成新的propagator graph，导致里面没有控制流，不然有if后也就会出现merge。 zhihu
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Källén–Lehmann spectral representation
In order to derive a spectral representation for the propagator of a field , one considers a complete set of states so that, for the two-point function Now, as we have the exact propagator given by the time-ordered two-point function, we have obtained the spectral decomposition. wikipedia.org
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Fermion doubling
Propagator and dispersion relation In the continuum theory, the Dirac propagator has a single pole as the theory describes only a single particle. However, calculating the propagator from the naive action yields for a fermion with momentum . wikipedia.org
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