Probing exotic phenomena at the interface of nuclear and particle physics with the electric dipole moments of diamagnetic atoms: A unique window to hadronic and semi-leptonic CP violation

The current status of electric dipole moments of diamagnetic atoms which involves the synergy between atomic experiments and three different theoretical areas -- particle, nuclear and atomic is reviewed. Various models of particle physics that predict CP violation, which is necessary for the existence of such electric dipole moments, are presented. These include the standard model of particle physics and various extensions of it. Effective hadron level combined charge conjugation (C) and parity (P) symmetry violating interactions are derived taking into consideration different ways in which a nucleon interacts with other nucleons as well as with electrons. Nuclear structure calculations of the CP-odd nuclear Schiff moment are discussed using the shell model and other theoretical approaches. Results of the calculations of atomic electric dipole moments due to the interaction of the nuclear Schiff moment with the electrons and the P and time-reversal (T) symmetry violating tensor-pseudotensor electron-nucleus are elucidated using different relativistic many-body theories. The principles of the measurement of the electric dipole moments of diamagnetic atoms are outlined. Upper limits for the nuclear Schiff moment and tensor-pseudotensor coupling constant are obtained combining the results of atomic experiments and relativistic many-body theories. The coefficients for the different sources of CP violation have been estimated at the elementary particle level for all the diamagnetic atoms of current experimental interest and their implications for physics beyond the standard model is discussed. Possible improvements of the current results of the measurements as well as quantum chromodynamics, nuclear and atomic calculations are suggested.Comment: 46 pages, 19 tables and 16 figures. A review article accepted for EPJ

“I’ll Be Home for Christmas”: The Role of International Maasai Migrants in Rural Sustainable Community Development

While the Maasai have to be among sub-Saharan Africa’s most mobile population due to their traditional transhumant pastoral livelihood strategy, compared with other neighboring ethnic groups they have been relatively late to migrate in substantial numbers for wage labour opportunities. In the community of Elangata Wuas in Southern Kenya, international migration for employment abroad has been very rare but promises to increase in significant numbers with the dramatic rise in education participation and diversification of livelihoods. Drawing on long-term ethnographic research and the specific experiences of the few international migrant pioneers in Elangata Wuas, this paper explores how community members assess the impacts of international migration on community sustainable development. It appears that international migration facilitates, and even exacerbates, inequality, which is locally celebrated, under an ethic of inter-dependence, as sustainable development. Particular attention is paid to the mechanisms of social control employed by community members to socially maintain their migrants as part of the community so that these migrants feel continued pressure and commitment to invest and develop their communities. Such mechanisms are importantly derived from the adaptability and accommodation of culture and the re-invention of tradition