User Wakabaloola

19 votes

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Problems while Wick rotating the path integral

answered Feb 7, 2018 at 20:43

16 votes

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Transformation of the energy-momentum tensor under conformal transformations

answered Jun 2, 2019 at 14:27

9 votes

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When can we handle a quantum field like a classical field?

answered Feb 16, 2018 at 12:04

7 votes

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Change in stress tensor under a Weyl transformation

answered Jan 4, 2021 at 19:44

6 votes

Polchinski String Theory p 105 Eq (3.6.18) Weyl Transformation of the Massless Vertex Operator

answered Feb 19, 2020 at 2:33

6 votes

Why is normal ordering a valid operation?

answered Jan 14, 2016 at 16:08

6 votes

Curved spacetime as a coherent state in string theory

answered Feb 1, 2018 at 20:07

6 votes

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2-pt String Sphere Amplitudes

answered Feb 6, 2018 at 20:14

5 votes

Propagator Correction in $\phi^4$ theory - why doesn't this secular growth break perturbation theory?

answered Feb 10, 2018 at 16:37

5 votes

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Ladder operator identity for $\langle n | (a+a^\dagger)^k | m \rangle$

answered Feb 14, 2018 at 21:42

5 votes

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Analytical solution for a Gaussian wave packet / free particle

answered Feb 15, 2018 at 14:44

5 votes

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Mobius invariance of the worldsheet 3-point function

answered May 24, 2019 at 14:40

4 votes

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$D0$ brane and open string bound state radiating a closed string

answered May 31, 2021 at 22:16

4 votes

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Is there any relationship between S-matrix elements and the path integral?

answered Nov 11, 2019 at 22:13

3 votes

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Polchinski massless vertex operator in the Polyakov approach p105 Eq. (3.6.16)

answered Feb 10, 2020 at 22:27

3 votes

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Calculating the numerical factor from Feynman diagram

answered Aug 2, 2019 at 19:49

3 votes

Beta function in QFT renormalization group

answered Feb 19, 2018 at 9:37

3 votes

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Polchinski's first derivation of the Weyl anomaly

answered Sep 18, 2021 at 10:58

3 votes

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Open string as intermediate state in closed string propagator

answered Dec 8, 2020 at 7:53

3 votes

Corners in the worldsheet and Ricci scalar term in the Polyakov action

answered Apr 26 at 9:57

2 votes

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Energy-momentum tensor normal ordering in Polchinski

answered Jan 31 at 7:41

2 votes

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The Interaction between the fundamental gravitational strings

answered Oct 26, 2020 at 5:43

2 votes

Seeing explicitly that the closed string dilaton is a scalar

answered Mar 17, 2018 at 12:53

2 votes

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Derivation of Holomorphic Ward Identities in Franceso's CFT

answered Apr 8, 2019 at 9:44

2 votes

Expressing the Schrödinger equation in 2nd quantised language

answered Apr 16, 2019 at 17:22

1 vote

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Composite Operators in Topological/Conformal Field Theory

answered Sep 5, 2018 at 22:41

1 vote

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Is the target space metric a dynamic field in the Polyakov action?

answered Sep 6, 2018 at 23:48

1 vote

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Feynman diagrams for $\varphi^3 + \varphi^4$

answered Feb 25, 2020 at 9:09

1 vote

Path integral for free fermion on torus

answered Mar 2, 2020 at 10:42

1 vote

Perturbative expansion and self-contractions in functional integral

answered Jul 10, 2020 at 20:20

Stack Exchange Network

32 Answers

Problems while Wick rotating the path integral

Transformation of the energy-momentum tensor under conformal transformations

When can we handle a quantum field like a classical field?

Change in stress tensor under a Weyl transformation

Polchinski String Theory p 105 Eq (3.6.18) Weyl Transformation of the Massless Vertex Operator

Why is normal ordering a valid operation?

Curved spacetime as a coherent state in string theory

2-pt String Sphere Amplitudes

Propagator Correction in $\phi^4$ theory - why doesn't this secular growth break perturbation theory?

Ladder operator identity for $\langle n | (a+a^\dagger)^k | m \rangle$

Analytical solution for a Gaussian wave packet / free particle

Mobius invariance of the worldsheet 3-point function

$D0$ brane and open string bound state radiating a closed string

Is there any relationship between S-matrix elements and the path integral?

Polchinski massless vertex operator in the Polyakov approach p105 Eq. (3.6.16)

Calculating the numerical factor from Feynman diagram

Beta function in QFT renormalization group

Polchinski's first derivation of the Weyl anomaly

Open string as intermediate state in closed string propagator

Corners in the worldsheet and Ricci scalar term in the Polyakov action

Energy-momentum tensor normal ordering in Polchinski

The Interaction between the fundamental gravitational strings

Seeing explicitly that the closed string dilaton is a scalar

Derivation of Holomorphic Ward Identities in Franceso's CFT

Expressing the Schrödinger equation in 2nd quantised language

Composite Operators in Topological/Conformal Field Theory

Is the target space metric a dynamic field in the Polyakov action?

Feynman diagrams for $\varphi^3 + \varphi^4$

Path integral for free fermion on torus

Perturbative expansion and self-contractions in functional integral