All Questions
Tagged with renormalization temperature
7
questions
4
votes
2
answers
190
views
Role of the natural temperature scale in the anomalous dimension of the renormalization group
In David Tong's lecture notes on statistical field theory, the concept of anomalous dimensions is introduced by considering the scaling of the correlation function $$\langle \phi(\mathbf{x}) \phi(\...
- 307
4
votes
0
answers
48
views
Why do some superconductors have a large $λ$ but a low $T_c$? Is it because mass renormalization dominates in these systems?
We know some superconductors have a large λ, but a low $T_c$. Some have a small λ but a high $T_c$. Why are they different? From the Eliashberg equations, we know the renormalization function is ...
- 41
2
votes
1
answer
74
views
Is flowing with RG in 1D Ising model equivalent to changing the temperature of the system
Let us consider the easiest form of the Ising Hamiltonian:
$$ \beta H(s_i; J) = -J\sum_i^N s_i s_{i+1} $$ ($\beta = 1/k_BT$ so we already defined $J = \tilde{J}/k_BT$ with $\tilde{J}$ constant).
...
- 97
1
vote
1
answer
133
views
What is the experimental evidence that the gravitational constant $G$ runs with energy (or temperature)?
Various papers on quantum field theory claim that $G$ runs with energy, like the fine structure constant does. Some examples:
Frolov, Fursaev and Zelnikov, Nucl.Phys. B486, 339 (1997)
Volovik and ...
user85598
1
vote
1
answer
120
views
Renormalization group flow when temperature $T < T_C$, $T_C$ being critical point temperature
Does renormalization group flow have to decrease temperature when $T<T_C$, with $T_C$ being critical point temperature? I think not, but my professor suggests something like that. Maybe I ...
- 53
1
vote
0
answers
200
views
Finite-Temperature $\phi^{4}$ theory - Why is the massless $T\neq 0$ contribution diverging?
I'm following Chapter 3 of Kapusta and Gale's Finite-Temperature Field Theory here.
I'm considering the following integral (the unrenormalized self-energy evaluated at zero-four momentum):
$$
\...
- 3,719
10
votes
2
answers
966
views
Temperature and Renormalization Scale in QFT
A particle physicist told me that everything in Peskin & Schroder is at zero temperature, and once you consider finite-$T$ QFT, things become more complicated. Meanwhile, I sometimes see people ...
- 399