Questions tagged [cpt-symmetry]
The cpt-symmetry tag has no usage guidance.
124
questions
0
votes
0
answers
28
views
Magnetic monopole in CPT universe model
I've recently read this paper CPT universe, and a thought came into my mind.
Is it possible to discuss magnetic monopole based on this CPT universe model?
This paper points out that some mysterious ...
- 425
1
vote
1
answer
40
views
$C$-number ignored in charge conjugation
In Weinberg’s QFT V1, under equation 5.5.58, he says that an anticommutator ($c$-number) can be ignored when we exchange spinors, $\psi$ and $\bar{\psi}$. I cannot fully appreciate why we can ignore ...
- 425
0
votes
0
answers
47
views
I want to know about origin of non-Hermitian quantum field theory model having two complex scalar fields $\phi_1$ and $\phi_2$
In the paper Symmetries and conservation laws in non-Hermitian field theories by Jean Alexandre, Peter Millington, and Dries Seynaeve, Phys. Rev. D 96, 065027 the authors use this Lagrangian:
$$ L = ...
0
votes
0
answers
14
views
Thermodynamics of T-symmetry violation
Physics is mostly time reversible. But certain nuclear interactions violate this T symmetry.
With T-symmetry a system at maximum entropy has no "arrow of time". Thus a video of the system ...
- 6,531
1
vote
0
answers
52
views
Magnetic Monopoles and Its Antimatter and Mirror Particle Counterparts [closed]
I'm trying to understand how magnetic monopoles and how its potential mirror and antiparticle counterparts would behave. So according to the modified lorentz force law
$$\vec{F}=q_e\left(\vec{E}+\frac{...
- 375
1
vote
1
answer
118
views
Charge conjugation is a symmetry for the quantized free Dirac action?
I am self-studying QFT on "A modern introduction to quantum filed theory" by Maggiore, and on page 95 he states: "For the free Dirac action, one immediately sees that C,P and T are ...
- 521
2
votes
0
answers
111
views
Confused about square of time-reversal operator $T$
I am reading An Introduction to Quantum Field Theory by Peskin & Schroeder, and I am confused about what is the square $T^2$ of time reversal operator $T$.
My guess is that for $P^2$, $C^2$ and $T^...
- 521
1
vote
1
answer
123
views
Are Hamiltonians CPT invariant?
I'm confused by the CPT theorem. It states (more or less) that a Lorentz invariant quantum field theory needs to be CPT invariant. But what does it actually mean for a QFT to be CPT invariant? It ...
- 13
1
vote
1
answer
44
views
Non-Hermitian PT-symmetric Interacting Hamiltonian with Real Spectra
The following hamiltonian is $\mathcal{PT}$-symmetric $$\mathcal{H} = -J \sum_{j = 1}^{2N} [ 1 + (-1)^j \delta ] [ c^{\dagger}_{j} c_{j+1} + h.c. ] + \imath \gamma \sum_{j = 1}^{2N} (-1)^j c^{\dagger}...
- 199
1
vote
0
answers
50
views
Are there theorems from electromagnetism that are a consequence of $C$, $P$ or $T$ invariance?
It's well known that classical electrodynamics is $C$, $P$ and $T$ invariant. For example, see this question Maxwell's equations and $C$, $P$, $T$ Symmetry. Are there theorems within CED that are a ...
- 3,108
1
vote
0
answers
45
views
Is really hermiticity necessary to be a physical observable? What about larger class of operators like PT invariant operators or pseudo hermitian one?
It's really necessary for an observable represented by an operator acting in a Hilbert space to be hermitian?
It's known that not only hermitian operators have real eigenvalues and that also normal ...
- 310
0
votes
0
answers
49
views
Is $CPT$ Symmetry already broken?
i came up this paper recently: https://doi.org/10.1140/epjc/s10052-020-08549-9 it describes the "CPT violation with decoherence effects" by Neutrinos.
This means CPT Symmetry is broken? And ...
- 1
1
vote
0
answers
54
views
Can you tell wavefunction's chirality by looking at it?
I recently learned, that:
Helicity is a combination of particle's "rotation"
(Spin) and direction of it's motion.
The motion is relativity-dependant, and so is helicity.
Chirality ...
- 199
2
votes
1
answer
106
views
CPT invariance and Soft Theorems
I am reading the paper IR Dynamics and Entanglement Entropy, written by Toumbas and Tomaras and I have a question on using the CPT invariance of the QED $S$-matrix elements in order to derive the ...
- 3,982
1
vote
1
answer
81
views
Enlarging the action of $C$, $P$ and $T$
I am now studying QFT using Schwartz's book, and I am going through the part discussing about how the charge conjugation, parity, and time-reversal operator acting on various object should look like. ...
- 55