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Observational Constraints On Power-Law Cosmologies
M. Kaplinghat, G. Steigman, I. Tkachev +1
In a class of models designed to solve the cosmological constant problem by coupling scalar or tensor classical fields to the space-time curvature, the universal scale factor grows…
Halo Star Lithium Depletion
M. H. Pinsonneault, T. P. Walker, G. Steigman +1
The depletion of lithium during the pre-main sequence and main sequence phases of stellar evolution plays a crucial role in the comparison of the predictions of big bang nucleosynt…
Big Bang Nucleosynthesis: Current Status
G. Steigman
During its hot, dense, early evolution the Universe was a primordial nuclear reactor, synthesizing the light nuclides D, 3He, 4He and 7Li in the first thousand seconds. The present…
Omega_B and Omega_0 From MACHOs and Local Group Dynamics
G. Steigman, I. Tkachev
We obtain restrictions on the universal baryon fraction, f_B = Omega_B/Omega_0, by assuming that the observed microlensing events towards the Large Magellanic Cloud are due to bary…
Non-BBN Constraints On The Key Cosmological Parameters
G. Steigman, N. Hata, J. E. Felten
Since the baryon-to-photon ratio "eta" is in some doubt at present, we ignore the constraints on eta from big bang nucleosynthesis (BBN) and fit the three key cosmological paramete…