All Questions
9 questions
6
votes
0
answers
300
views
What intuition led to J. Wang and X.G. Wen's lattice formulation of the 3450 chiral gauge theory?
In the paper cited below, Juven Wang and Xiao-Gang Wen give an example of a lattice model that reduces to a chiral $U(1)$ gauge theory at low energy. The low energy theory is called the $3450$ model. ...
- 55k
7
votes
1
answer
379
views
On-site symmetries can be gauged, but is a gaugeable symmetry necessarily on-site?
I've always liked lattice QFT because it's mathematically unambiguous and non-perturbative, but it does have two drawbacks: (1) the lattice is artificial, and (2) some features are messy. One of those ...
- 55k
5
votes
1
answer
218
views
Phenomenology application of quantum anomaly
Anomaly means that: the system has a symmetry at classical level (both discrete and continous), but when we quantize the theory, the system no longer holds the symmetry.
I'm wondering for every ...
- 547
7
votes
2
answers
2k
views
Anomaly inflow mechanism
I know very simple example of anomaly inflow. See section 4.4 in David Tong: Lectures on Gauge Theory. As I read, such mechanism have some applications in condensed matter and in quantum field theory, ...
- 5,737
3
votes
1
answer
284
views
Anomalies on boundary and bulk physics
Few times I faced with such statements:
The gravitational anomaly of the 1+1d boundary system is known to be
proportional to the thermal Hall conductivity of the 2+1 dimensional
bulk
How ...
- 5,737
0
votes
0
answers
118
views
A Universe with only a single fermion
Is a Universe with only a single fermion anomalous instead of free from anomalies?
(e.g. electron, defined through fermi statistics with exchange statistics with a gained $-1$ sign, or rotating 360 ...
user32229
4
votes
0
answers
516
views
Anomaly for Majorana fermion?
In 4-spacetime dimension, is there U(1) gauge field chiral anomaly associated with Majorana fermion (or I am not sure if it is equivalent, majorana representation)? Besides, I have read from several ...
- 531
8
votes
1
answer
1k
views
Zumino's consistent and covariant anomalies - applied to quantum hall?
What is the `physical' meaning of consistent anomalies and covariant anomalies?
Perhaps a good Reference is:
Consistent and covariant anomalies in gauge and gravitational theories -
William A. ...
- 7,928
6
votes
0
answers
866
views
Descent equation and anomaly polynomial [closed]
I am just reading Ryu, Moore and Ludwig's paper on classifications of topological insulators and quantum anomaly. They are trying to relate the quantum anomaly as a signal of the presence of a ...
- 811