Deviation from the Cosmological Constant or Systematic Errors?

Details Deviation from the Cosmological Constant or Systematic Errors? Deviation from the Cosmological Constant or Systematic Errors?

2009-04-18

arxiv.org/abs/0904.2832v2

Monthly Notices of the Royal Astronomical Society: Letters, 398 (2009) L78-L82

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 4 figures, added references

Scientific paper

10.1111/j.1745-3933.2009.00713.x

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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