Mathematics – Logic
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...64n&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 64-65
Mathematics
Logic
Scientific paper
Recent observations of distant quasars have indicated a variation of the fine structure constant with cosmic time. This has motivated the appearance of several theories where ones consider a time varying speed of light (VSL). In this work we investigate matter creation in the context of two types of VSL cosmologies. In the first the speed of light has a power law dependence on the scale factor c(t)µa-p and in the second it depends upon Hubble parameter c(t)µHq. For a Friedmann-Robertson-Walker line element we write the energy conservation law arising from Einstein field equations and study how particles are created as c changes with cosmic epoch. We show that, for the speed of light decreasing with time and if the cosmological constant does not depend on time, energy is conserved if Wm = 1/2. We also show that the second law of thermodynamics demands that Wm £ 1/2 if there is no particle creation. This result also holds if we have an adiabatic creation process. In this case, and for a flat (k = 0) universe, the cosmological constant has to be non-zero otherwise it would violate the second law. Finally, we calculate the present particle creation rate due to the decay of the speed of light. For cµa-p one has y0@2.6pn0H0 and for cµHq it gives y0@1.17qn0H0 for the present value of the matter and cosmological constant density parameter equal 0.3 and 0.7, respectively.
Camara C. S.
Carvalho João C.
Nascimento R. B.
No associations
LandOfFree
Matter creation in VSL theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Matter creation in VSL theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Matter creation in VSL theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1665393