User maplemaple

36 votes

2 answers

1k views

Can we get complete non-perturbative information of the interacting system by computing perturbation to all orders?

asked Aug 15, 2018 at 23:37

35 votes

1 answer

4k views

What's the relation between Wilson Renormalization Group (RG) in Statistical Mechanics and QFT RG?

asked Nov 15, 2017 at 21:12

23 votes

3 answers

2k views

How to rigorously argue that the superposition state is unstable in spontaneously symmetry breaking case

asked Dec 12, 2017 at 1:44

21 votes

2 answers

4k views

Locality in QFT vs "non-local" in QM

asked Nov 6, 2017 at 18:51

16 votes

1 answer

2k views

Gauge invariance is just a redundancy. Why is massive abelian gauge field renormalizable but massive non-abelian gauge field nonrenormalizable?

asked Dec 16, 2017 at 23:04

14 votes

1 answer

2k views

What's the key point to argue that pure gravity can't be renormalizable from two-loop?

asked Dec 14, 2017 at 20:30

10 votes

1 answer

1k views

Why does Josephson's identity $d\nu=2-\alpha$ only hold for mean field theory in dimension $4$?

asked Oct 18, 2017 at 2:00

9 votes

2 answers

630 views

Question about the existence of non-Abelian anyon

asked Nov 22, 2017 at 0:25

9 votes

2 answers

780 views

Adding gauge fixing directly by hand is different from by Lagrange multiplier?

asked Dec 13, 2017 at 5:53

8 votes

2 answers

1k views

What's the geometric (or representation independent) definition of central charge of Lie algebra $\mathfrak{g}$?

asked Dec 7, 2017 at 20:35

8 votes

1 answer

933 views

For dimensional regularization, why the arbitrary mass scale $\mu$ has the meaning of UV cutoff?

asked Dec 19, 2018 at 3:15

8 votes

2 answers

2k views

Explicit computation of singular part of two-loop sunrise diagram

asked Jan 1, 2019 at 3:57

6 votes

1 answer

2k views

Book recommendations for learning about open quantum systems

asked Nov 4, 2017 at 19:47

6 votes

2 answers

599 views

Why is classical spin the spin-$\infty$ representation of $SO(3)$, not the spin-$1$ representation of $SO(3)$?

asked Nov 11, 2017 at 17:33

6 votes

1 answer

505 views

Condensed Matter or High Energy examples in which higher-loop $n\ge 2$ correction can have important physical consequence?

asked Jan 30, 2018 at 2:08

5 votes

2 answers

740 views

How is it possible a quadratic Hermitian Hamiltonian $H = b^\dagger b^\dagger + b b$, with $b$ boson, cannot be diagonalized?

asked Jun 7, 2019 at 17:26

3 votes

1 answer

172 views

Connected components of conformal group $ {\rm Conf}(p,q)$ containing $P$, $T$ and conformal inversion are same or different?

asked Mar 11, 2019 at 18:58

3 votes

1 answer

550 views

What's the Lie group generated only by dilation and Poincaré symmetry?

asked Nov 7, 2017 at 21:02

2 votes

2 answers

221 views

Transformation has $\delta \mathcal{L}=0$ but $\delta S \neq 0$ and $\delta S \neq \epsilon \int_{\partial\Omega} d^3 x f $

asked Dec 10, 2017 at 4:35

2 votes

1 answer

407 views

Is the conformal group $\mathrm{Conf}(p,q) ≃ \mathrm{O}(p + 1, q + 1) / \mathbb{Z_2} $ connected or not?

asked Jan 16, 2018 at 22:33

1 vote

1 answer

586 views

Question about Mode expansion of free compact boson

asked Jan 14, 2019 at 4:38

1 vote

1 answer

213 views

Question about a system with all bounded orbits closed and maximal integrable

asked Mar 21, 2018 at 22:17

0 votes

1 answer

371 views

Question about conformal transformation on fields

asked Jan 13, 2018 at 18:14

Stack Exchange Network

23 Questions

Can we get complete non-perturbative information of the interacting system by computing perturbation to all orders?

What's the relation between Wilson Renormalization Group (RG) in Statistical Mechanics and QFT RG?

How to rigorously argue that the superposition state is unstable in spontaneously symmetry breaking case

Locality in QFT vs "non-local" in QM

Gauge invariance is just a redundancy. Why is massive abelian gauge field renormalizable but massive non-abelian gauge field nonrenormalizable?

What's the key point to argue that pure gravity can't be renormalizable from two-loop?

Why does Josephson's identity $d\nu=2-\alpha$ only hold for mean field theory in dimension $4$?

Question about the existence of non-Abelian anyon

Adding gauge fixing directly by hand is different from by Lagrange multiplier?

What's the geometric (or representation independent) definition of central charge of Lie algebra $\mathfrak{g}$?

For dimensional regularization, why the arbitrary mass scale $\mu$ has the meaning of UV cutoff?

Explicit computation of singular part of two-loop sunrise diagram

Book recommendations for learning about open quantum systems

Why is classical spin the spin-$\infty$ representation of $SO(3)$, not the spin-$1$ representation of $SO(3)$?

Condensed Matter or High Energy examples in which higher-loop $n\ge 2$ correction can have important physical consequence?

How is it possible a quadratic Hermitian Hamiltonian $H = b^\dagger b^\dagger + b b$, with $b$ boson, cannot be diagonalized?

Connected components of conformal group $ {\rm Conf}(p,q)$ containing $P$, $T$ and conformal inversion are same or different?

What's the Lie group generated only by dilation and Poincaré symmetry?

Transformation has $\delta \mathcal{L}=0$ but $\delta S \neq 0$ and $\delta S \neq \epsilon \int_{\partial\Omega} d^3 x f $

Is the conformal group $\mathrm{Conf}(p,q) ≃ \mathrm{O}(p + 1, q + 1) / \mathbb{Z_2} $ connected or not?

Question about Mode expansion of free compact boson

Question about a system with all bounded orbits closed and maximal integrable

Question about conformal transformation on fields