Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-08-15
Int.J.Mod.Phys. D6 (1997) 69-90
Astronomy and Astrophysics
Astrophysics
18 pages
Scientific paper
10.1142/S0218271897000066
We explore the cosmological model in which a late-time mild inflation is realized after the star formation epoch. Non-vanishing curvature coupling of a classical boson field yields this mild inflation without a cosmological constant. Accordingly the lifetime of the present Universe is remarkably increased in our model. Thus we show that the present observed high value of the Hubble parameter $H_0 \approx 70-80{\rm km/sec/Mpc}$ is compatible with the age of the oldest stars $14{\rm Gyr}$ without introducing the cosmological constant or the open Universe model. Moreover in our model, the local Hubble parameter becomes larger than the global one. Thus we show that the present observed local Hubble parameter measured by using the Cepheid variables is compatible with the global Hubble parameter measured by using the Sunyaev-Zeldovich effect. We also examine the energy conditions, evolution of the effective gravitational constant and the nucleosynthesis process.
Fukuyama Takeshi
Hatakeyama Mikiko
Miyoshi Masae
Morikawa Masahiro
Nakamichi Akika
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