List questions from quantum-field-theory

Published on 22 Mar 2026 - 7:00

70

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$\int_{-\infty}^\infty \int_{-\infty}^\infty \exp(-(x_1^2+x_2^2+(x_1-x_2)^2)-\lambda(x_1^4+x_2^4)dx_1dx_2$ by summing the series in $\lambda$.

Published on 09 Jul 2019 - 11:27

169

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Integrating a scalar function on a manifold

Published on 12 Jul 2019 - 12:07

94

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Delta function of a product

Published on 18 Jul 2019 - 17:58

62

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Spherical Integral from a dot product in d dimensions

Published on 19 Jul 2019 - 15:14

187

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Formal Definition of Renormalization Group Flow

Published on 24 Mar 2026 - 22:29

191

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Help understanding the derivation of Maxwell's equations from Euler-Lagrange equations

Published on 17 Aug 2019 - 14:55

292

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Differentiation of an unitary operator in series expansion ( Quantum Mechanics )

Published on 18 Aug 2019 - 17:20

190

Views

Decay of a convolution from its Fourier transform

Published on 23 Aug 2019 - 16:22

46

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Product of $0$ operator with another (unbounded) operator is nonzero?

Published on 08 Sep 2019 - 16:24

587

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Cyclic Properties of the trace in Quantum Field Theory

Published on 13 Apr 2014 - 4:21

382

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Homotopy quantum field theories as functors

Published on 29 Apr 2014 - 0:26

297

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Poisson summation formula for the Casimir effect

Published on 25 May 2014 - 23:02

140

Views

Calculating an integral with a branch cut, using some "uniqueness property"

Published on 25 Mar 2026 - 3:19

345

Views

How can an improper integral have multiple values?

Published on 08 Jun 2014 - 7:48

List Question

Rewriting a state as a field in CFT

$\int_{-\infty}^\infty \int_{-\infty}^\infty \exp(-(x_1^2+x_2^2+(x_1-x_2)^2)-\lambda(x_1^4+x_2^4)dx_1dx_2$ by summing the series in $\lambda$.

Integrating a scalar function on a manifold

Delta function of a product

Spherical Integral from a dot product in d dimensions

Formal Definition of Renormalization Group Flow

Help understanding the derivation of Maxwell's equations from Euler-Lagrange equations

Differentiation of an unitary operator in series expansion ( Quantum Mechanics )

Decay of a convolution from its Fourier transform

Product of $0$ operator with another (unbounded) operator is nonzero?

Cyclic Properties of the trace in Quantum Field Theory

Homotopy quantum field theories as functors

Poisson summation formula for the Casimir effect

Calculating an integral with a branch cut, using some "uniqueness property"

How can an improper integral have multiple values?

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