Dynamical supersymmetry breaking on magnetized tori and orbifolds

We construct several dynamical supersymmetry breaking (DSB) models within a single ten-dimensional supersymmetric Yang-Mills (SYM) theory, compactified on magnetized tori with or without orbifolding. We study the case that the supersymmetry breaking is triggered by a strong dynamics of $SU(N_C)$ SYM theory with $N_F$ flavors contained in the four-dimensional effective theory. We show several configurations of magnetic fluxes and orbifolds, those potentially yield, below the compactification scale, the field contents and couplings required for triggering DSB. We especially find a class of self-complete DSB models on orbifolds, where all the extra fields are eliminated by the orbifold projection and DSB successfully occurs within the given framework. Comments on some perspectives for associating the obtained DSB models with the other sectors, such as the visible sector and another hidden sector for, e.g., stabilizing moduli, are also given.Comment: 18 page

A viable D-term hybrid inflation

We propose a new model of the D-term hybrid inflation in the framework of supergravity. Although our model introduces, analogously to the conventional D-term inflation, the inflaton and a pair of scalar fields charged under a $U(1)$ gauge symmetry, we study the logarithmic and exponential dependence on the inflaton field, respectively, for the K\"ahler and superpotential. This results in a characteristic one-loop scalar potential consisting of linear and exponential terms, which realizes the small-field inflation dominated by the Fayet-Iliopoulos term. With the reasonable values for the coupling coefficients and, in particular, with the $U(1)$ gauge coupling constant comparable to that of the Standard Model, our D-term inflation model can solve the notorious problems in the conventional D-term inflation, namely, the CMB constraints on the spectral index and the generation of cosmic strings.Comment: 16 pages, 14 figure

ホウ素を含むPd基合金ナノ粒子の合成と同定

京都大学新制・課程博士博士(理学)甲第23026号理博第4703号新制||理||1674(附属図書館)京都大学大学院理学研究科化学専攻(主査)教授 北川 宏, 教授 吉村 一良, 教授 有賀 哲也学位規則第4条第1項該当Doctor of ScienceKyoto UniversityDGA

Flavor landscape of 10D SYM theory with magnetized extra dimensions

We study the flavor landscape of particle physics models based on a ten-dimensional super Yang-Mills theory compactified on magnetized tori preserving four-dimensional ${\cal N}=1$ supersymmetry. Recently, we constructed a semi-realistic model which contains the minimal supersymmetric standard model (MSSM) using an Ansatz of magnetic fluxes and orbifolding projections. However, we can consider more various configurations of magnetic fluxes and orbifolding projections preserving four-dimensional ${\cal N}=1$ supersymmetry. We research systematically such possibilities for leading to MSSM-like models and study their phenomenological aspects.Comment: 24 pages, 3 figures. arXiv admin note: text overlap with arXiv:1211.431

Production for Reduction

Today, the city of Tokyo is confronting several prominent social issues, such as extreme aging, a growing single population and the beginning of population shrinkage. There are around 810,000 empty houses in the city while many new apartments are still being built, replacing family owned factories with small rooms for singles.As the new technology in urban factories trigger the shift from “how to make” to “what to make” in production, more focus shall be given to production steps such as “meet”, “talk”, “inspire”, “think” and “share”. Coincidentally, these steps are what is often missing from the daily lives of those living alone in new apartments, isolated from the existing neighborhoods. What if a factory aims at combining, there in the city, the production of living activities with the production of products? A theoretical project has challenged this question as part of a pursuit of new ideas for the time of reduction.Shrinking population, extreme aging, low birth rate, but a growing singles population are some of the prominent social structures underpinning the 2020 Olympics preparation for Japan (Eberstadt, 2012). Unlike the 1964 Tokyo Olympics, when the economy was growing and industries were flourishing, today the city of Tokyo is confronting a very different set of issues and is in need of new ideas that can accommodate residents’ desires at a time of reduction

Modulus D-term Inflation

We propose a new model of single-field D-term inflation in supergravity, where the inflation is driven by a single modulus field which transforms non-linearly under the U(1) gauge symmetry. One of the notable features of our modulus D-term inflation scenario is that the global U(1) remains unbroken in the vacuum and hence our model is not plagued by the cosmic string problem which can exclude most of the conventional D-term inflation models proposed so far due to the CMB observations.Comment: 15 pages, 5 figure