Built on

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2015

Decaying dark matter and the tension in $\sigma_8$

Enqvist, Kari, Nadathur, Seshadri, Sekiguchi, Toyokazu et al.

Understand

We consider decaying dark matter (DDM) as a resolution to the possible tension between cosmic microwave background (CMB) and weak lensing (WL) based determinations of the amplitude of matter fluctuations, $\sigma_8$.

We perform N-body simulations in a model where dark matter decays into dark radiation and develop an accurate fitting formula for the non-linear matter power spectrum, which enables us to test the DDM model by the combined measurements of CMB, WL and the baryon acoustic oscillation (BAO).
We employ a Markov chain Monte Carlo analysis to examine the overlap of posterior distributions of the cosmological parameters, comparing CMB alone with WL+BAO.
We find an overlap that is significantly larger in the DDM model than in the standard CDM model.

Built on

S. Aoyama, K. Ichiki, D. Nitta and N. Sugiyama, JCAP 1109
Original
1984
Earlier work this paper cites.
R. Flores, G. R. Blumenthal, A. Dekel and J. R. Primack, Nature 323
1986
Earlier work this paper cites.
Y. Suto, Astrophys. J. 321
1987
Earlier work this paper cites.
C. P. Ma and E. Bertschinger, Astrophys. J. 455
1995
Earlier work this paper cites.
A. Lewis, A. Challinor and A. Lasenby, Astrophys. J. 538
2000
Earlier work this paper cites.
R. Cen, Astrophys. J. 546
2001
Earlier work this paper cites.
V. Springel, N. Yoshida and S. D. M. White, New Astron. 6
2001
Earlier work this paper cites.
M. Bartelmann and P. Schneider, Phys. Rept. 340
2001
Earlier work this paper cites.
A. Lewis and S. Bridle, Phys. Rev. D 66
2002
Earlier work this paper cites.
M. Oguri, K. Takahashi, H. Ohno and K. Kotake, Astrophys. J. 597
2003
Earlier work this paper cites.
K. Takahashi, M. Oguri and K. Ichiki, Mon. Not. Roy. Astron. Soc. 352
2004
Earlier work this paper cites.

Similar

K. Ichiki, M. Oguri and K. Takahashi, Phys. Rev. Lett. 93
2004
Cited alongside, same era.
V. Springel, Mon. Not. Roy. Astron. Soc. 364
2005
Cited alongside, same era.
M. Crocce, S. Pueblas and R. Scoccimarro, Mon. Not. Roy. Astron. Soc. 373
2006
Cited alongside, same era.
S. Miyazaki et al
2006
Cited alongside, same era.
M. Y. Wang and A. R. Zentner, Phys. Rev. D 82
Original
2010
Cited alongside, same era.
A. H. G. Peter, Phys. Rev. D 81
Original
2010
Cited alongside, same era.