Adjustment of the electric current in pulsar magnetospheres and origin of subpulse modulation |
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Authors: | Yuri Lyubarsky |
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Institution: | (1) Department of Physics, University of Guilan, Rasht, Iran;(2) School of Physics, University of New South Wales, Sydney, NSW, 2052, Australia;(3) Sciences Faculty, Department of Physics, Mazandaran University, P.O. Box 47416-95447, Babolsar, Iran;(4) Institute for Studies in Theoretical Physics and Mathematics (IPM), P.O. Box 19395-5531, Tehran, Iran |
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Abstract: | Stability analysis of agegraphic dark energy in Brans-Dicke theory is presented in this paper. We constrain the model parameters
with the observational data and thus the results become broadly consistent with those expected from experiment. Stability
analysis of the model without best fitting shows that universe may begin from an unstable state passing a saddle point and
finally become stable in future. However, with the best fitted model, There is no saddle intermediate state. The agegraphic
dark energy in the model by itself exhibits a phantom behavior. However, contribution of cold dark matter on the effective
energy density modifies the state of the universe from phantom phase to quintessence one. The statefinder diagnosis also indicates
that the universe leaves an unstable state in the past, passes the LCDM state and finally approaches the sable state in future. |
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