著者

井田 大輔

出版者

一般社団法人日本物理学会

雑誌

日本物理學會誌 (ISSN:00290181)

巻号頁・発行日

vol.62, no.4, pp.238-244, 2007-04-05

被引用文献数

1

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膜宇宙と呼ばれる時空モデルの出現とともに,プランクスケールよりずっと大きな余剰次元の存在可能性が指摘された.そのような巨視的な余剰次元をもつ時空においては,古典論的な高次元ブラックホールが登場人物として現れる.ブラックホールを通して,高次元の時空の理論のさまざまな側面が見えてくるであろう.しかし一方では,ブラックホールは時空の次元によってずいぶん性質が異なることがしだいに認識されるようになつた.このような高次元時空のブラックホールに関する最近の研究とその周辺の話題を紹介する.

著者

井田 大輔

出版者

桃山学院大学

雑誌

桃山学院大学経済経営論集 = ST.ANDREW'S UNIVERSITY ECONOMIC AND BUSINESS REVIEW (ISSN:02869721)

巻号頁・発行日

vol.59, no.4, pp.1-22, 2018-02-20

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This paper reviews the impact of aging population on the natural rate ofinterest and monetary policy from the new Keynesian model (NKM)perspective. The standard NKM has been used in recent analysis ofmonetary policy. However, it limits the effect of heterogeneous agents onthe private sector. Therefore, how aging population changes the effect ofmonetary policy on the real economy cannot be examined. This surveyfocuses on the NKM augmented with the role of heterogeneous agentsand shows that economic shocks have asymmetric impacts on differenthouseholds and that a change in the demographic structure significantlyaffects the dynamics of the natural rate of interest.

著者

井田 大輔

出版者

桃山学院大学総合研究所

雑誌

桃山学院大学経済経営論集 = ST.ANDREW'S UNIVERSITY ECONOMIC AND BUSINESS REVIEW (ISSN:02869721)

巻号頁・発行日

vol.60, no.4, pp.19-45, 2019-02-15

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This paper surveys the objective of monetary policy based on the newKeynesian model (NKM). The standard NKM is supported by a microfoundationof structural equations in contrast to the traditional Keynesianmodel. Therefore, in the analysis of optimal monetary policy, the centralbank’s loss function must be supported by its micro-foundation. In theNKM, the loss function is derived from a second-order approximation of thehousehold’s utility function. More specifically, the objective of monetarypolicy aims at stabilizing both inflation and the output gap in the standardNKM. However, the standard NKM has often been criticized, because itsstructure fails to explain actual economic dynamics. Previous studies showthat the shape of the central bank’s loss function is modified in accordancewith a change in a given economic structure. This paper focuses on therelationship between such an economic structural change and the shape ofthe central bank’s loss function, derived in the corresponding model.