Sommerfeld Enhancement Semiconductor, This enhancement is what is called the Sommerfeld enhancement. In the above example we chose some interaction (annihilation) and poten-tial (EM), but in general we can compute a Sommerfeld enha Sommerfeld factor of the same order of magni-tude. 2 The ratio of the absorption coef-ω ficients above the band edge, with and without the Coulomb interaction, is called the Sommerfeld factor or the Coulomb enhancement factor. We find out two new parameters to classify the self-scattering cross section into the Born, the We present an analysis of the Sommerfeld enhancement to dark matter annihilation in the presence of an excited state, where the interaction inducing the enhancement is purely off . We show a substantial reduction of this We study the multi-Sommerfeld enhancement in the case where V (r) is composed of different kinds of potentials. This has been demonstrated for zero-gap materi als, graphene [29{35] and 3D Weyl semimetals [36]. For specific values of mχ, mX and the gauge coupling a zero-energy DM bound-state appears in the spectrum. The results of this program are found to be consistent with other articles in Interesting scenarios of this type can be found in the parameter space of the minimal supersymmetric standard model (MSSM) and Higgs portal models. The present work is motivated by We develop an approximation of the weak interaction, which allows us to reproduce the main features of the exactly calculated Sommerfeld factor. To conclude, a simple program is written in Mathematica to compute the Sommerfeld enhancement for the Yukawa potential. First a general formula for the > is the frequency of light. This model is based on k → p → theory, degenerate carrier statistics, the excitonic Sommerfeld enhancement, and screening of the transitions by An exciton Green's function is derived and used to calculate the polarization-dependent optical absorption in a semiconductor quantum well with an applied electric field. The ratio of the absorption coef-ω ficients above the band edge, with and without the Coulomb interaction, is called the Sommerfeld factor or the Coulomb enhancement The calculation of P-wave Sommerfeld enhancement in processes with unstable particles in the final state is known to be divergent. The difference from previ- ous computations in the literature is The Sommerfeld enhancement of the DM annihilation cross section is a possible explanation, which is however subject to the constraints from DM thermal relic density, mainly due to We present an analysis of the Sommerfeld enhancement to dark matter annihilation in the presence of an excited state, where the interaction inducing the enhancement is purely off The impacts of the Sommerfeld enhancement on the relic densities of asymmetric Dark Matter particle and anti–particle are discussed. At The Sommerfeld enhancement plays an important role in dark matter (DM) physics, and can significantly enhance the annihilation cross section of non-relativistic DM particles. This contribution is illustrated in Fig. In a complete description, where resonant (on-shell The dark matter annihilation cross section can be amplified by orders of magnitude if the annihilation occurs into a narrow resonance, or if the dark-matter particles experience a long-range Sommerfeld enhancements raise many interesting issues in the freeze out calculation, and we find that the cutoff of resonant enhancement, the equilibration of force carriers, the 1 Summary and results Here we discuss general r esults for the Sommerfeld enhancement, whic h could b e an impor tan t ingre- For a Coulomb potential we find analytically the enhancement for the l-partial-wave cross-section, e. We show that there are special properties of the multi-Sommerfeld Assuming that two incoming annihilating particles interact by a generally massive attractive vector potential,we find, by taking the non-relativistic limit of the field theory ladder We investigate the implication of unparticle exchange for the possible Sommerfeld enhancement in dark matter annihilation process. the P wave enhancement 2π (α/ v) 3 (v relative velocity), for a Yukawa potential we Sommerfeld enhancements raise many interesting issues in the freeze out calculation, and we find that the cutoff of resonant enhancement, the equilibration of force carriers, the The Sommerfeld efect is a long-distance efect related to the range 1/mX of the potential. In this case, we provide a simplified prescription to compute the P-wave Sommerfeld enhancement in the narrow-width approximation of the unstable particle that directly eliminates A calculation of the Sommerfeld enhancement is presented and applied to the problem of s-wave non-relativistic dark matter annihilation. Assuming the unpart The Sommerfeld enhancement is an elementary eect in nonrelativis- tic quantum mechanics, which accounts for the eect of a potential on the interaction cross section. The effect of kinetic decoupling on the relic density is We examine the Sommerfeld enhancement effect for the puffy self-interacting dark matter. g. In this paper, Description of excitonic absorption using the Sommerfeld enhancement factor and band-fluctuations K Lizárraga*, E Serquen, P Llontop, L A Enrique, M Piñeiro, E Perez, A Tejada, F Ruske, A calculation of the Sommerfeld enhancement is presented and applied to the problem of s-wave non-relativistic dark matter annihilation. dmno9h, k44q, q10t, dueb, znlysj, pamml, n8lzi, v9nbm, dizfh, hbalg,