User user196574

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Confusion about Lagrangian formulation of electromagnetics

answered Nov 2, 2020 at 6:05

6 votes

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Why does the Born approximation for the scattering amplitude depend on the potential $V$ everywhere in space, unlike classical scattering?

answered Jul 22, 2020 at 21:01

5 votes

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Integrability of a non-integrable quantum spin model at critical point

answered Dec 11, 2021 at 9:25

4 votes

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Magnetization in Quantum Transverse Ising Model: Mean Field Theory vs Reality

answered Apr 10, 2020 at 0:40

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Are there classical infinite order / continuous non-symmetry breaking phase transititions besides Berezinskii-Kosterlitz-Thouless (BKT)?

answered Dec 1, 2022 at 6:01

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Deducing the central charge of the Ising model from the free energy

answered Jan 21, 2023 at 18:04

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Perturbation theory in Griffiths

answered Sep 12, 2018 at 6:23

1 vote

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Integral and Wick rotation (Srednicki ch75)

answered May 17, 2019 at 5:37

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Anomalies in Global Symmetries (Srednicki ch 76)

answered Jun 17, 2019 at 0:28

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$S^+$ acting on a spin chain raises the entropy by at most $\ln(2)$

answered May 2, 2021 at 21:31

1 vote

Is there a zero correlation length spin-$1$ chain in the Haldane phase?

answered Oct 27, 2022 at 18:40

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What is the $XXX_s$ Hamiltonian in terms of $\vec{S}_i \cdot \vec{S}_{i+1}$?

answered Oct 6, 2021 at 21:40

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Lorentz covariant but Lorentz inconsistent $4$-forces?

answered Feb 4 at 4:48

0 votes

2d Ising model with a longitudinal field -- do the low and high temperature expansions converge for all nonzero $T$?

answered 21 hours ago

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Energy current in a quantum chain

answered Dec 10, 2021 at 7:31

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$G$-injective MPS and symmetry-broken phases

answered Jul 18, 2023 at 5:34

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Coupling two Ising chains via an energy-energy interaction

answered Dec 12, 2023 at 4:31

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Choosing an Irreducible Tensor Operator Basis where the Singular Values of Each Basis Element are the Same

answered Jun 25, 2021 at 3:30

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Uniqueness of Poisson's equation in presence of unknown bound charge

answered Aug 15, 2021 at 23:55

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19 Answers

Confusion about Lagrangian formulation of electromagnetics

Why does the Born approximation for the scattering amplitude depend on the potential $V$ everywhere in space, unlike classical scattering?

Integrability of a non-integrable quantum spin model at critical point

Magnetization in Quantum Transverse Ising Model: Mean Field Theory vs Reality

Are there classical infinite order / continuous non-symmetry breaking phase transititions besides Berezinskii-Kosterlitz-Thouless (BKT)?

Deducing the central charge of the Ising model from the free energy

Perturbation theory in Griffiths

Integral and Wick rotation (Srednicki ch75)

Anomalies in Global Symmetries (Srednicki ch 76)

$S^+$ acting on a spin chain raises the entropy by at most $\ln(2)$

Is there a zero correlation length spin-$1$ chain in the Haldane phase?

What is the $XXX_s$ Hamiltonian in terms of $\vec{S}_i \cdot \vec{S}_{i+1}$?

Lorentz covariant but Lorentz inconsistent $4$-forces?

2d Ising model with a longitudinal field -- do the low and high temperature expansions converge for all nonzero $T$?

Energy current in a quantum chain

$G$-injective MPS and symmetry-broken phases

Coupling two Ising chains via an energy-energy interaction

Choosing an Irreducible Tensor Operator Basis where the Singular Values of Each Basis Element are the Same

Uniqueness of Poisson's equation in presence of unknown bound charge