Built on

M. Chevallier and D. Polarski, “Accelerating universes with scaling dark matter,” Int. J. Mod. Phys. D 10
2001
Earlier work this paper cites.
H. J. Seo and D. J. Eisenstein, “Probing dark energy with baryonic acoustic oscillations from future large galaxy redshift surveys,” Astrophys. J. 598
2003
Earlier work this paper cites.
E. V. Linder, “Exploring the expansion history of the universe,” Phys. Rev. Lett. 90
2003
Earlier work this paper cites.
D. J. Eisenstein, H. J. Seo, E. Sirko and D. Spergel, “Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak,” Astrophys. J. 664
2007
Earlier work this paper cites.
L. Lyons, “Open statistical issues in Particle Physics,” Ann. Appl. Stat. 2
2008
Earlier work this paper cites.
N. Padmanabhan and M. White, “Calibrating the Baryon Oscillation Ruler for Matter and Halos,” Phys. Rev. D 80
Original
2009
Earlier work this paper cites.
E. Komatsu et al
Original
2009
Earlier work this paper cites.
F. Beutler et al
Original
2011
Earlier work this paper cites.
C. Blake et al
Original
2011
Earlier work this paper cites.

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2016

Isolating the Lyman Alpha Forest BAO Anomaly

Evslin, Jarah

Understand

A 2.5-3 sigma discrepancy has been reported between the baryonic acoustic oscillation peak (BAO) in the Lyman $\alpha$ forest at $z\sim 2.34$ and the best fit Planck $\Lambda$CDM cosmology.

To isolate the origin of the tension, we consider unanchored BAO, in which the standard BAO ruler is not calibrated, eliminating any dependence on cosmology before redshift $z\sim 2.34$.
We consider BOSS BAO measurements at $z\sim 0.32$, 0.57 and 2.34, using the full 2-dimensional constraints on the angular and line of sight BAO scale, as well as isotropic BAO measurements by 6dF and SDSS at $z\sim 0.106$ and $z\sim 0.15$.
We find that the $z>0.43$ data alone is in 2.9 sigma of tension with $\Lambda$CDM with or without the Planck best fit values of the mass fraction $\Omega_m$ and the BAO scale $r_d H_0$, indicating that the tension arises not from the $\Lambda$CDM parameters but from the dark energy evolution itself at 0.57<z<2.34.

Built on

M. Chevallier and D. Polarski, “Accelerating universes with scaling dark matter,” Int. J. Mod. Phys. D 10
2001
Earlier work this paper cites.
H. J. Seo and D. J. Eisenstein, “Probing dark energy with baryonic acoustic oscillations from future large galaxy redshift surveys,” Astrophys. J. 598
2003
Earlier work this paper cites.
E. V. Linder, “Exploring the expansion history of the universe,” Phys. Rev. Lett. 90
2003
Earlier work this paper cites.
D. J. Eisenstein, H. J. Seo, E. Sirko and D. Spergel, “Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak,” Astrophys. J. 664
2007
Earlier work this paper cites.
L. Lyons, “Open statistical issues in Particle Physics,” Ann. Appl. Stat. 2
2008
Earlier work this paper cites.
N. Padmanabhan and M. White, “Calibrating the Baryon Oscillation Ruler for Matter and Halos,” Phys. Rev. D 80
Original
2009
Earlier work this paper cites.
E. Komatsu et al
Original
2009
Earlier work this paper cites.
F. Beutler et al
Original
2011
Earlier work this paper cites.
C. Blake et al
Original
2011
Earlier work this paper cites.