Summary
DerSarkissian (1985) has proposed cosmological models in which the initial hadronic mass density and temperature are maximum but finite. We show that the initial pressure in these models is infinite and negative and we discuss the implications of this result.
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References
M. DerSarkissian:Nuovo Cimento B,88, 29 (1985).
M. DerSarkissian:Lett. Nuovo Cimento,35, 285 (1982)M. DerSarkissian:Lett. Nuovo Cimento,36, 261 (1983).
A. Beesham:Nuovo Cimento B,96, 17 (1986).
A. Beesham:Int. J. of Theor. Phys.,25, 1295 (1986). In this and in the previous reference an error involving the insertion of an extraG in the equation\(\rho \dot G = -- c^2 \dot \Lambda /8\pi \) occurs. This arises because of the omission of a factor 1/G that multiplies\(\dot \Lambda \) in eqs. (14) of ref.A. Beesham:Nuovo Cimento B,96 17 (1986) and (4) of ref.A. Beesham:Int. J. of Theor. Phys.,25, 1295 (1986).
Ø. Grøn:Am. J. Phys.,54, 46 (1986), and references therein.
If\(\dot R(\tau ) = 0\), then\(\dot R(\tau ) > 0\) implies thatR is minimum att=τ.
Unless a dramatic upsurge in the pressure had occurred immediately after creation one cannot takep=0 fort≳τ.
A recent singularity-free cosmological model has been proposed byM. Özer andM. O. Taha:Nucl. Phys. B,287, 776 (1987).
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Abdel-Rahman, AM.M. Comment on the paper «The cosmological constant (Λ) as a possible primordial link to Einstein’s theory of gravity, the properties of hadronic matter and the problem of creation». Nuov Cim B 102, 225–228 (1988). https://doi.org/10.1007/BF02726570
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DOI: https://doi.org/10.1007/BF02726570