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W. Hu, ApJ 506, 485 (1998) [arXiv:astro-ph/9801234]
1998
Earlier work this paper cites.
A. Lewis, A. Challinor, & A. Lasenby, ApJ 538, 473 (2000) [arXiv:astro-ph/9911177]; http://camb.info
2000
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S.M. Carroll & M. Kaplinghat, Phys. Rev. D 65, 063507 (2002) [arXiv:astro-ph/0108002]
2002
Earlier work this paper cites.
D. Huterer & G. Starkman, Phys. Rev. Lett. 90, 031301 (2003) [arXiv:astro-ph/0207517]
2003
Earlier work this paper cites.
W. Hu & T. Okamoto, Phys. Rev. D 69, 043004 (2004) [arXiv:astro-ph/0308049]
2004
Earlier work this paper cites.
M. Doran and G. Robbers, JCAP 0606, 026 (2006) [arXiv:astro-ph/0601544]
2006
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E.J. Copeland, M. Sami, S. Tsujikawa, Int. J. Mod. Phys. D 15, 1753 (2006) [arXiv:hep-th/0603057]
2006
Earlier work this paper cites.
S. Leach, MNRAS 372, 646 (2006) [arXiv:astro-ph/0506390]
2006
Earlier work this paper cites.

Similar

M.J. Mortonson & W. Hu, ApJ 672, 737 (2008) [arXiv:0705.1132]
Original
2008
Cited alongside, same era.
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Original
2008
Cited alongside, same era.
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Cited alongside, same era.
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Original
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Then

S. Das, T.A. Marriage, P.A.R. Ade et al., ApJ 729, 62 (2011); J. Dunkley, R. Hlozek, J. Sievers et al., ApJ 739, 52 (2011)
2011
Later among the works it cites.
E. Shirokoff, C.L. Reichardt, L. Shaw et al., ApJ 736, 61 (2011); R. Keisler, C.L. Reichardt, K.A. Aird et al., ApJ 743, 28 (2011)
2011
Later among the works it cites.
E.V. Linder & T.L. Smith, JCAP 1106, 001 (2011) [arXiv:1009.3500]
Original
2011
Later among the works it cites.
Planck Collaboration, P.A.R. Ade, N. Aghanim et al., A&A, 536, A1 (2011); http://planck.esa.int
2011
Later among the works it cites.
E. Calabrese, R. de Putter, D. Huterer, E.V. Linder, A. Melchiorri, Phys. Rev. D 83, 023011 (2011) [arXiv:1010.5612]
Original
2011
Later among the works it cites.

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2012

Model Independent Early Expansion History and Dark Energy

Samsing, Johan, Linder, Eric V., Smith, Tristan L.

Understand

We examine model independent constraints on the high redshift and prerecombination expansion history from cosmic microwave background observations, using a combination of principal component analysis and other techniques.

This can be translated to model independent limits on early dark energy and the number of relativistic species $N_{\rm eff}$.
Models such as scaling (Doran-Robbers), dark radiation ($\Delta N_{\rm eff}$), and barotropic aether fall into distinct regions of eigenspace and can be easily distinguished from each other.
Incoming CMB data will map the expansion history from $z=0$--$10^5$, achieving subpercent precision around recombination, and enable determination of the amount of early dark energy and valuable guidance to its nature.

Built on

W. Hu, ApJ 506, 485 (1998) [arXiv:astro-ph/9801234]
1998
Earlier work this paper cites.
A. Lewis, A. Challinor, & A. Lasenby, ApJ 538, 473 (2000) [arXiv:astro-ph/9911177]; http://camb.info
2000
Earlier work this paper cites.
S.M. Carroll & M. Kaplinghat, Phys. Rev. D 65, 063507 (2002) [arXiv:astro-ph/0108002]
2002
Earlier work this paper cites.
D. Huterer & G. Starkman, Phys. Rev. Lett. 90, 031301 (2003) [arXiv:astro-ph/0207517]
2003
Earlier work this paper cites.
W. Hu & T. Okamoto, Phys. Rev. D 69, 043004 (2004) [arXiv:astro-ph/0308049]
2004
Earlier work this paper cites.
M. Doran and G. Robbers, JCAP 0606, 026 (2006) [arXiv:astro-ph/0601544]
2006
Earlier work this paper cites.
E.J. Copeland, M. Sami, S. Tsujikawa, Int. J. Mod. Phys. D 15, 1753 (2006) [arXiv:hep-th/0603057]
2006
Earlier work this paper cites.
S. Leach, MNRAS 372, 646 (2006) [arXiv:astro-ph/0506390]
2006
Earlier work this paper cites.

Similar

M.J. Mortonson & W. Hu, ApJ 672, 737 (2008) [arXiv:0705.1132]
Original
2008
Cited alongside, same era.
R. de Putter & E.V. Linder, Astropart. Phys. 29, 424 (2008) [arXiv:0710.0373]
Original
2008
Cited alongside, same era.
S. Galli, A. Melchiorri, G.F. Smoot, O. Zahn, Phys. Rev. D 80, 023508 (2009) [arXiv:0905.1808]
Original
2009
Cited alongside, same era.
E.V. Linder & R.J. Scherrer, Phys. Rev. D 80, 023008 (2009) [arXiv:0811.2797]
Original
2009
Cited alongside, same era.
E.V. Linder, Phys. Rev. D 79, 063519 (2009) [arXiv:0901.0918]
Original
2009

Then

S. Das, T.A. Marriage, P.A.R. Ade et al., ApJ 729, 62 (2011); J. Dunkley, R. Hlozek, J. Sievers et al., ApJ 739, 52 (2011)
2011
Later among the works it cites.
E. Shirokoff, C.L. Reichardt, L. Shaw et al., ApJ 736, 61 (2011); R. Keisler, C.L. Reichardt, K.A. Aird et al., ApJ 743, 28 (2011)
2011
Later among the works it cites.
E.V. Linder & T.L. Smith, JCAP 1106, 001 (2011) [arXiv:1009.3500]
Original
2011
Later among the works it cites.
Planck Collaboration, P.A.R. Ade, N. Aghanim et al., A&A, 536, A1 (2011); http://planck.esa.int
2011
Later among the works it cites.
E. Calabrese, R. de Putter, D. Huterer, E.V. Linder, A. Melchiorri, Phys. Rev. D 83, 023011 (2011) [arXiv:1010.5612]
Original
2011
Later among the works it cites.