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Deviation from the Cosmological Constant or Systematic Errors?
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Deviation from the Cosmological Constant or Systematic Errors?
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Motivated by the fact that both SNe Ia and GRBs seem to prefer a dark energy EOS greater than -1 at redshifts $z \gtrsim 0.5$, we perform a careful investigation on this situation. We find that the deviation of dark energy from the cosmological constant at redshifts $z \gtrsim 0.5$ is large enough that we should pay close attention to it with future observational data. Such a deviation may arise from some biasing systematic errors in the handling of SNe Ia and/or GRBs or more interestingly from the nature of the dark energy itself.
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