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5 papers · 1 filter
Varying Fine-Structure Constant and the Cosmological Constant Problem
Yasunori Fujii
We start with a brief account of the latest analysis of the Oklo phenomenon providing the still most stringent constraint on time-variability of the fine- structure constant . C…
Quintessence, scalar-tensor theories and non-Newtonian gravity
Yasunori Fujii
We discuss some of the issues which we encounter when we try to invoke the scalar-tensor theories of gravitation as a theoretical basis of quintessence. One of the advantages of ap…
A two-scalar model for a small but nonzero cosmological constant
Yasunori Fujii
We revisit a model of the two-scalar system proposed previously for understanding a small but nonzero cosmological constant. The model provides solutions of the scalar-fields energ…
How natural is a small but nonzero cosmological constant?
Yasunori Fujii
Based on our previous attempt, we propose a better way to understand a small but nonzero cosmological constant, as indicated by a number of recent observational studies. We re-exam…
Induced Violation of Weak Equivalence Principle in the Brans-Dicke Theory
Yasunori Fujii
A quantum correction to the Brans-Dicke theory due to interactions among matter fields is calculated, resulting in violation of WEP, hence giving a constraint on the parameter …