Renormalization is an ensemble of techniques which serves to treat the infinities which appear in quantum field theory or statistical mechanics.
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is cosmic expansion related with IR divergencies?
This question is related to renormalization, but in the IR limit. It is assumed that unitarity does take care of IR divergencies in interacting theories like QED. But how would one interpret ...
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RG of the Gaussian Model: Finding the scaling factor
I'm studying how the Renormalization Group treatment of the simple Gaussian model,
$$\beta H = \int d^d r \left[ \frac{t}{2} m^2(r) + \frac{K}{2}|\nabla m|^2 - hm(r)\right]$$
In momentum space, the ...
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mathematical explanation for UV divergences and $ \delta ^{(n)}(0) $
is there any mathematical explanation for the UV divergences ??
i have read that in the framework of Epstein-Glser theory :D these UV divergences appear from the product of distributions
anyone does ...
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Renormalization Group for anisotropic “Gaussian” model
I'm considering an "anisotropic" Hamiltonian of the form
$$\beta H = \int d^n r_{||} d^{d-n} r_{\bot} \frac{K}{2} (\nabla_{||} m)^2 + \frac{L}{2} (\nabla^2_\bot m)^2 + \frac{t}{2}m^2 - hm$$
which in ...
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A question on charge renormalization in QED
Let us work with charge renormalization in QED. Consider 2-point photon correlation function $\Pi_2(q^2)$ at one loop level. We normalize the coupling constant at $q^2=0$ (point of normalization). ...
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Does the measure of proximity of two theories in “theory space” run?
From reading this article, I have learned that two effective QFTs can be very close together in the "theory space" appropriate to describe for example physics at the LHC scale, whereas the ...
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Who works professionally on reformulation of QFT?
P. Dirac was worried with the infinities and their discarding in QED. He wanted us to reformulate the theory in order to eliminate infinities and renormalizations from the very beginning. Is there ...
