Nonlinearly Realized Extended Supergravity

We provide nonlinear realization of supergravity with an arbitrary number of supersymmetries by means of coset construction. The number of gravitino degrees of freedom counts the number of supersymmetries, which will be possibly probed in future experiments. We also consider goldstino embedding in the construction to discuss the relation to nonlinear realization with rigid supersymmetries.Comment: 19 page

Attitudes toward Visible Migrants in the Baltic States: An Empirical Analysis with Social Survey Data

This research, using European Social Survey (ESS) data, investigates effects of the social, economic, and political backgrounds on Baltic inhabitants’ attitudes toward non-European visible migrants. Results show that attitudes toward such migrants are defined not merely by an individual’s level of social awareness, but are also related to respondents’ economic status and political orientation. Although some findings might be intuitively known by local context, this research contributes to providing concrete, empirical evidence to enable better understanding of rapidly-emerging source of social tensions

Rise of Outsiders in Estonia and Latvia Municipal Elections in 2017: Radical Rightist and Reformist Populist

Estonia and Latvia held municipal elections in 2017 and each case saw the rise of political outsiders, so-called populist and/or radical-right parties. While the two republics have a high level of similarity in their socioeconomic backgrounds and political systems, a comparative analysis of the 2017 municipal elections in their two capital cities demonstrates interesting contrasts. In Estonia, the radical-right party won seats where such rightist parties had not been popular earlier, while in Latvia, the reformistic populist party won seats where the rightist party had long been popular. What these elections had in common, however, were that they demonstrated their` newness\u27 within existing political contexts. This implies a nuanced background for the reasons behind the change in European party politics, including how and when radical-rightist and populist parties emerge. The rise of these outsider parties is, to some degree, connected with already-existing contexts of party competitions

National government versus ethnic minority : ethnopolitics and party systems in new Europe

制度:新 ; 報告番号:甲3770号 ; 学位の種類:博士(政治学) ; 授与年月日:2012/12/12 ; 早大学位記番号:新6143Waseda Universit

Can we explain cosmic birefringence without a new light field beyond Standard Model?

The recent analysis of the Planck 2018 polarization data shows a nonzero isotropic cosmic birefringence (ICB) that is not explained within the $\Lambda$CDM paradigm. We then explore the question of whether the nonzero ICB is interpreted by the framework of the Standard Model Effective Field Theory (SMEFT), or at the energy scales of the cosmic microwave background, the low-energy EFT (LEFT) whose dynamical degrees of freedom are five SM quarks and all neutral and charged leptons. Our systematic study reveals that any operator in the EFT on a cosmological background would not give the reported ICB angle, which is observationally consistent with frequency independence. In particular, we estimate the size of the ICB angle generated by the effect that the cosmic microwave background photons travel through the medium of the cosmic neutrino background with parity-violating neutrino-photon interactions and find that it would be too small to explain the data. If the reported ICB angle should be confirmed, then our result would indicate the existence of a new particle that is lighter than the electroweak scale and feebly interacting with the SM particles.Comment: 8+7 pages, no figur