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seen Oct 22 at 4:47

Diego Mazón


Sep
29
reviewed Approve suggested edit on Lagrangian mechanics is different form Newtonian?
Sep
24
awarded  Autobiographer
Jul
25
awarded  Nice Answer
Jul
19
awarded  Necromancer
Jul
12
awarded  Yearling
Jul
2
awarded  Curious
May
30
awarded  Nice Question
Mar
7
comment Why am I wrong about how to view gauge theory?
In this context a redundant transformations means that it does not change the physical state of the system but only the field related to it (and that creates spurious d.o.f).
Mar
7
comment Why am I wrong about how to view gauge theory?
1) Are you saying that non-large gauge transformations (those that are continuously connected with the identity) change the physical state of a system? 2) The gauge transformations you say that they are not redundancies, do they tend to the identity in the space-time boundary? Are they the so-called "large gauge transformations"? Thanks.
Feb
20
awarded  Nice Answer
Feb
17
awarded  quantum-field-theory
Feb
10
comment When is quasiparticle same as elementary excitation, and when is not?
@huotuichang The Poincare algebra has two quadratic Casimir invariant: the square of the cuadri-momentum (the particle's mass) and the square of the Pauli- Lubanski (related to the spin or helicity of the particle), which self-commute. Therefore, the eigenvalues of these operators are good label. This classification is originally due to Wigner. Elementary particles are also classified according to the way they transform under the gauge group of the standard model $U_y(1)\times SU_l(2)\times SU_c(3)$
Feb
7
comment When is quasiparticle same as elementary excitation, and when is not?
Hello @IsidoreSeville Then, can some of you provide the definition of "elementary excitation" in condensed matter physics? I only see one sense in which an "elementary excitation" can be elementary. If this answer is correct, then, in my opinion, this condensed matter terminology should be abandoned because it is confusing and useless.
Feb
7
revised When is quasiparticle same as elementary excitation, and when is not?
dictionary and short answer added
Feb
7
comment When is quasiparticle same as elementary excitation, and when is not?
Hello, you read correctly, but excitation=particle, while elementary$\neq$collective . Thanks.
Feb
6
revised When is quasiparticle same as elementary excitation, and when is not?
added 232 characters in body
Feb
6
awarded  Custodian
Feb
6
reviewed Approve suggested edit on What determines color — wavelength or frequency?
Feb
6
reviewed Approve suggested edit on What is the geometrical interpretation of Ricci tensor?
Feb
6
comment When is quasiparticle same as elementary excitation, and when is not?
The question asks about the difference between quasiparticles and elementary particles.