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Bookmark or Share- What Does Up-Down Asymmetry Mean? - Physics Stack ExchangeAs I understand the matter, the existence or non-existence of up-down asymmetry in charmed baryon decays is not a trivial consequence of the physical laws that make up the Standard Model of particle physics (unlike, for example, lepton universality where recent experimentally results have appeared to show violations of this principle at lower ...
- Rashba effect vs Dresselhaus effect (spin orbit coupling)Inversion symmetry may also be broken by an electric field $\mathbf{E}$, giving rise to the Bychkov-Rashba SOI. This electric field may arise due to the spatial variation of the band edge in asymmetric nanostructures and hence the effect is refered to as structural inversion asymmetry (SIA) SOI. The contribution to the Hamiltonian is given by
- Physical Interpretation of Forward-Backward AsymmetryThe equation you present is perhaps not the most intuitive, but it falls under the more general "forward-backward" ratio or asymmetry equation, which looks something like $$\mathcal{A}=\dfrac{F-B}{F+B},$$
- Is the collapse of the wave function inherently time asymmetric?As suggested in the answer above, in general, decoherence increases the entropy associated with a quantum system and as such has the same type of time-reversal asymmetry that appears in thermodynamics. The question, however, is also concerned with how an "uncollapse" would look like. Here I want to illustrate how this can be done in principle.
- What is the value of the baryon asymmetry? [duplicate]Define the baryon asymmetry, which sometimes is called the baryon density, as the baryons to photons ratio $\eta = n_b/n_\gamma$. I found in Ref. 1, published in 2018, that the value of $\eta$ is of order $ 6.1 \pm 0.3 \times 10^{-10} $ by observing the cosmic microwave background experimentally by Planck satellite.
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