Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userCouplings of NN(npi) n geq 1
89
0
0.0
(
0
)
Authors
Bing An Li
Ask ChatGPT about the research
No Arabic abstract
Determinations of the couplings of $N N (n pi) (n geq 1)$ are reported. The study is based on both a quark model of nucleon and a chiral field theory of mesons. The coupling of $N N pi$ is predicted and is in agreement with current value. It shows that the coupling $ N N 2 pi $ is resulted in the nature that pion is a Goldstone boson. The couplings of $N N (n pi) (n geq 2)$ are predicted by this approach.
rate research
Read More
I present derivation of Luschers finite size formula for the elastic $Npi$ and the $NN$ scattering system for several angular momenta from the relativistic quantum field theory.
In the N=1 four-dimensional new-minimal supergravity framework, we supersymmetrise the coupling of the scalar kinetic term to the Einstein tensor. This coupling, although introduces a non-minimal derivative interaction of curvature to matter, it does not introduce harmful higher-derivatives. For this construction, we employ off-shell chiral and real linear multiplets. Physical scalars are accommodated in the chiral multiplet whereas curvature resides in a linear one.
We investigate the subradiance properties of $ngeq 2$ multilevel fermionic atoms loaded into the lowest motional level of a single trap (e.g.~a single optical lattice site or an optical tweezer). As pointed out in our previous work [arXiv:1907.05541], perfectly dark subradiant states emerge from the interplay between fermionic statistics and dipolar interactions. While in [arXiv:1907.05541] we focused on the $n=2$ case, here we provide an in-depth analysis of the single-site dark states for generic filling $n$, and show a tight connection between generic dark states and total angular momentum eigenstates. We show how the latter can also be used to understand the full eigenstate structure of the single-site problem, which we analyze numerically. Apart from this, we discuss two possible schemes to coherently prepare dark states using either a Raman transition or an external magnetic field to lift the Zeeman degeneracy. Although the analysis focuses on the single-site problem, we show that multi-site dark states can be trivially constructed in any geometry out of product states of single-site dark states. Finally, we discuss some possible implementations with alkaline-earth(-like) atoms such as $^{171}$Yb or $^{87}$Sr loaded into optical lattices, where they could be used for potential applications in quantum metrology and quantum information.
A famous example of gauge/gravity duality is the result that the entropy density of strongly coupled ${cal N}=4$ SYM in four dimensions for large N is exactly 3/4 of the Stefan-Boltzmann limit. In this work, I revisit the massless O(N) model in 2+1 dimensions, which is analytically solvable at finite temperature $T$ for all couplings $lambda$ in the large N limit. I find that the entropy density monotonically decreases from the Stefan-Boltzmann limit at $lambda=0$ to exactly 4/5 of the Stefan-Boltzmann limit at $lambda=infty$. Calculating the retarded energy-momentum tensor correlator in the scalar channel at $lambda=infty$, I find that it has two logarithmic branch cuts originating at $omega=pm 4 T ln frac{1+sqrt{5}}{2}$, but no singularities in the whole complex frequency plane. I show that the ratio 4/5 and the location of the branch points both are universal within a large class of bosonic CFTs in 2+1 dimensions.
We embed general solutions to 4D Einstein-Maxwell theory into $mathcal{N} geq 2$ supergravity and study quadratic fluctuations of the supergravity fields around the background. We compute one-loop quantum corrections for all fields and show that the $c$-anomaly vanishes for complete $mathcal{N}=2$ multiplets. Logarithmic corrections to the entropy of Kerr-Newman black holes are therefore universal and independent of black hole parameters.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
