Delicate f(R) gravity models with disappearing cosmological constant and observational constraints on the model parameters

We study the $f(R)$ theory of gravity using metric approach. In particular we investigate the recently proposed model by Hu-Sawicki, Appleby $-$ Battye and Starobinsky. In this model, the cosmological constant is zero in flat space time. The model passes both the Solar system and the laboratory tests. But the model parameters need to be fine tuned to avoid the finite time singularity recently pointed in the literature. We check the concordance of this model with the $H(z)$ and baryon acoustic oscillation data. We find that the model resembles the $\Lambda$CDM at high redshift. However, for some parameter values there are variations in the expansion history of the universe at low redshift.Comment: 16 pages and 9 figures, typos corrected, few references and minor clarifications added, revised version to appera in PR

セリアスラリーによる酸化膜の平坦化CMPに関する基礎的検討

Ceria(CeO2) slurry has a strong merit in CMF polishing to give a high removal rate. However, it has an unfavorable reputation of problems linked to its quick sedimentation, agglomeration of particles, purity, difficult cleaning, and high cost. In the present study, focusing on the particular issue of the slurry dispersibility, we examined the effect ofultra-sonic (US) treatment ofslurry on its stability and its CMF polishing characteristics in order to make ceria slurry stably applicable to the planarizationCMF. As a result, the US treatment has proved remarkably effective in the elimination of agglomerates, improvement of slurry stability, increase of removal rate and better roughness, offering a breakthrough for the realization ofhigh performance ceria slurry for CMP planarization Comparing to silica slurry, we thus obtained ceria slurry that produces same polished roughness but six times higher removal rate when polished at the pressure of 500g/cm^2.textapplication/pdfdepartmental bulletin pape

Delicate f(R) gravity models with a disappearing cosmological constant and observational constraints on the model parameters

We study the f(R) theory of gravity using the metric approach. In particular we investigate the recently proposed model by Hu and Sawicki; Appleby and Battye; and Starobinsky. In this model, the cosmologicalconstant is zero in flat space time. The model passes both the solar system and the laboratory tests. But the model parameters need to be fine-tuned to avoid the finite time singularity recently pointed to in the literature. We check the concordance of this model with the H(z) and baryon acoustic oscillation data. We find that the model resembles the ΛCDM at high redshift. However, for some parameter values there are variations in the expansion history of the universe at low redshift.journal articl

Search for D0-D̅0 Mixing in D0→K+π- Decays and Measurement of the Doubly-Cabibbo-Suppressed Decay Rate

journal articl

拡張色空間法による2次元カラーコード画像の色認識に関する研究

application/pdf三重大学大学院地域イノベーション学研究科博士前期課程地域イノベーション学専攻4, 56thesi

センタン バイオ ケイソク キソ

一分子イメージング、一分子計測について技術的基礎から適用例について解説する。先端融合科学特論I 2008年10月7日5限講義資料learning objec

薩摩半島北部植生調査報告

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