p波相互作用するフェルミ原子気体の衝突特性

電気通信大学201

p波相互作用するフェルミ原子気体の衝突特性

電気通信大学201

Ethnic Conflict in Pakistan: The Case of MQM

It has been argued that the current scholarship on ethnicity is focused on the rise of ethnonationalism, without incorporating the possibility and the nature of decline in its scope and intensity. An absolute majority of such movements have indeeded been contained in the postwar era. There is no reason to believe that this trend will reverse in near future. In this context, one can point to Pakistan, Baloch and Sindhi nationalist movements within Pakistan. Our discussion of the rise of the mohajir movement in this paper provides clear indicators of the potential determinants of its decline. It is significant that it is the state at the non-policy level which created a situation of ethnic explosion in urban Sindh. Various macro-level explosive issues revolving around conflicts between politicians and army, federalist and provincial forces, Islamist and secularist elements and, externally, India and Pakistan seriously circumscribed the state’s capacity and will to persue micro-level issues such as urban planning educational and manpower strategies, rural-urban and inter provincial migration and investment in mental infrastructure in general. The abdication of policy by the state rendered it inactive and irrelevent. This ‘residual’ state was represented by officials at the bottom level who controlled a vast number of transactional activities outside the purview of law. Ethnicity emerged as the new source of definition and categorisation of interests and identity formation as the state defaulted on various counts such as citizen orientations, legal protection and security of life and property. In other words, it was not too much of the (Jacobin) state, as primordialists would have us believe, but rather too little of it which produced the mohajir ethnic consciousness. We can maintain that the process of nativisation of mohajir is the product of multiple locational and transactional activities which do not necessarily reflect state policies.

Axisymmetric photonic structures with PT-symmetry

Copyright 2016 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.PT-symmetric structures in photonic crystals, combining refractive index and gain-loss modulations is becoming a research field with increasing interest due to the light directionality induced by these particular potentials. Here, we consider PT-symmetric potentials with axial symmetry to direct light to the crystal central point obtaining a localization effect. The axial and PT-symmetric potential intrinsically generates an exceptional central point in the photonic crystal by the merge of both symmetries. This particular point in the crystal lattice causes field amplitude gradients with exponential slopes around the crystal center. The field localization strongly depends on the phase of the central point and on the complex amplitude of the PT-potential. The presented work analyzes in a first stage 1D linear PT-axisymmetric crystals and the role of the central point phase that determines the defect character, i.e. refractive index defect, gain-loss defect or a combination of both. The interplay of the directional light effect induced by the PT-symmetry and the light localization around the central point through the axial symmetry enhances localization and allows higher field concentration for certain phases. The linearity of the studied crystals introduces an exponential growth of the field that mainly depends on the complex amplitude of the potential. The work is completed by the analysis of 2D PT-axisymmetric potentials showing different spatial slopes and growth rates caused by symmetry reasons.Peer ReviewedPostprint (published version

Polynomial Filtered HMC -- an algorithm for lattice QCD with dynamical quarks

Polynomial approximations to the inverse of the fermion matrix are used to filter the dynamics of the upper energy scales in HMC simulations. The use of a multiple time-scale integration scheme allows the filtered pseudofermions to be evolved using a coarse step size. We introduce a novel generalisation of the nested leapfrog which allows for far greater flexibility in the choice of time scales. We observe a reduction in the computational expense of the molecular dynamics integration of between 3--5 which improves as the quark mass decreases.Comment: 10 pages, 7 figure