Smooth quotients of bi-elliptic surfaces

We consider the quotient X of bi-elliptic surface by a finite automorphism group. If X is smooth, then it is a bi-elliptic surface or ruled surface with irregularity one. As a corollary any bi-elliptic surface cannot be Galois covering of projective plane, hence does not have any Galois embedding

Search for 3rd generation superpartners with the ATLAS experiment

Two of the most important parameters in supersymmetry are the masses of the stop and sbottom, the supersymmetric partners of the third generation quarks. A stop mass lighter than 1 TeV is favored theoretically; however, "conventional" searches based on the simplified models have not produced experimental evidence for a light stop. It is possible that the light stop evades our searches due to a compressed sparticle mass spectrum. Therefore, the searches are extended to cover a broader range of signal scenarios with different mass splittings between the stop, neutralino(s), and chargino(s). The searches are then interpreted in the context of both simplified models and pMSSM models. Recent ATLAS results from searches for direct stop (sbottom) pair production are presented in final states with jets and missing transverse-momentum (and leptons). The analyses are based on 36 fb$^{-1}$ of $\sqrt{s}$=13 TeV proton-proton collision data recorded with ATLAS detector at the LHC in 2015 and 2016.Comment: Talk presented at the APS Division of Particles and Fields Meeting (DPF 2017), July 31-August 4, 2017, Fermilab. C170731. arXiv admin note: substantial text overlap with arXiv:1709.0105

Sextic variety as Galois closure variety of smooth cubic

Let V be a nonsingular projective algebraic variety of dimension n. Suppose there exists a very ample divisor D such that D^n=6 and dim H^0(V, O(D))=n+3. Then, (V, D) defines a D_6-Galois embedding if and only if it is a Galois closure variety of a smooth cubic in P^{n+1} with respect to a suitable projection center such that the pull back of hyperplane of P^n is linearly equivalent to D

Galois embedding of K3 surface --abelian case--

We study Glois embeddings of K3 surfaces in the case where the Galois groups are abelian. We show several properties of K3 surfaces concerning the Galois embeddings. In particular, if the Galois group G is abelian, then G is isomorphic to Z/4Z, Z/6Z or Z/2Z\oplusZ/2Z\oplusZ/2Z and S is a smooth complete intersection of hypersurfaces. Further, we state the detailed structure of such surfaces

Tacky “Shakespeares” in Japan

There is no doubt that Shakespeare is “the flagship commodity” in the globalized cultural market. The fact that his works are being studied, performed, and admired, or, adapted and parodied almost all over the world, would surely testify that his works are great sources to be capitalized on (both culturally and materially) in the consumerist society in which we live. However, it could be also argued that the brand logo, “Shakespeare,” no longer holds such a privileged status, that it is merely one of numerous cultural artifacts that can be used and recycled, and that one of the few convenient things about “Shakespeare” is that it can be reproduced, copied, and parodied without the need for any royalty payments being made? Some popular, global, tacky “shakespeares” seek to destabilize the presupposed notion that “Shakespeare” is the dominant, central, hegemonic icon by juxtaposing “Shakespeare” with other artifacts, which are presumed to be of minimal capitalist and cultural value. This article attempts to illustrate how (in)significant or (un)influential Shakespeare, as a residual socio-cultural icon, can be. Tackyfying “Shakespeares” can, however, also be a means to proliferate the Bard. Japanese pop “Shakespeares,” proudly and assertively tacky, offer tributes to the great Bard

On the General Existence of Pure Strategy Political Competition Equilibrium in Multi-dimensional Party-Faction Models

In this paper, we consider political competition games of two parties in multi-dimensional policy spaces, where the two parties have two factions, opportunists and militants, that intra-party bargain with each other. In such a game, we adopt the party-unanimity Nash equilibrium (PUNE) [Roemer (1998; 1999; 2001)] as an appropriate solution concept, and examine the general existence problem of this. In particular, we suppose that any faction of each party does not necessarily have dictatorial power. We then provide a general existence theorem for PUNE in this class of games.multi-dimensional political competition games, partyunanimity Nash equilibria, pure-compromise PUNE

Decline of Japan's Predominance in Asia

Until around 1980 Japanese companies occupied a predominant position in Asia. In terms of the scale of operation, level of technology and international competitiveness, they surpassed local Asian companies. They enjoyed number one position. International business of Japanese companies in Asia had two characteristics. The first is so-called flying geese pattern of investment.　Japanese companies invested first in relatively well developed countries like Taiwan, Hong Kong, Singapore and Korea. Then, they shifted their investment to Thailand, Malaysia, Indonesia and Philippines. Lastly, their investment extended to China and Vietnam. The second characteristic is that their Asian operations are managed by Japanese persons using the Japanese language. CEOs and other top management at most Asian subsidiaries are Japanese expatriates. And they manage their companies having constant communication with their Japanese head offices in the Japanese language. Japanese companies in Asia have bright and dark aspects. Factories are bright in the sense that they achieve good performance with motivated local workers. Japanese production system works well at their Asian factories. On the other hand, administrative offices have problems. They do not attract high level local managerial, professional and engineering people. Limits of Japanese style international management are evident at the offices. In forecasting the future of Japanese business in Asia, China may be the most important factor. China has continued rather high level of economic growth for more than twenty years since its basic policy change in 1978. Will China's economy grow in the future? As the market economy will develop, the tension between the market economy and the politics of socialism will increase. Will the politics of one party system be able to coexist with the market economy? It may be that Japanese companies have already hit their peak of their overall international competitiveness in Asia. They might have already started to go on the declining process. They invest more in foreign countries than in Japan, which results in the hallowing of industry at home. They are facing various kinds of resistance to change such as so-called lifetime employment, existing organization routines, vested interests and sunk costs. Japanese companies are managed by old men and thus lack in strong leadership.

On Non-welfarist Social Ordering Functions

In this paper, criticizing the welfarist's framework in traditional welfare economics which provides a rather limited perspective for social evaluation, we propose a more comprehensive framework in which extended social ordering functions (ESOFs) are introduced. In this framework, not only welfaristic values, but also non-welfaristic values can be treated appropriately. Then, we examine the possibility of non-welfarist ESOFs which meet a value of Individual Autonomy, a criterion of non-welfairst distributive justice, and the welfarist Pareto principle. First, there is no first best ESOF in the sense that the above three axioms are satisfied simultaneously. Second, however, we can show the existence of some second best ESOFs, using a weaker lexicographic application method.