Fetching the paper…
Reading the bibliography…
Absent any indirect tests on the thermal history of the Universe prior to the formation of light nuclear elements, it is legitimate to investigate situations where, before nucleosyntheis, the sound speed of the plasma was larger than $c/\sqrt{3}$, at most equalling the speed of light $c$.
R. Isaacson, Phys. Rev. 166
1968
Earlier work this paper cites.
Y. B. Zeldovich, Mon. Not. Roy. Astron. Soc. 160
1972
Earlier work this paper cites.
L. H. Ford and L. Parker, Phys. Rev. D 16
1977
Earlier work this paper cites.
A. Abramovici et al., Science 256
1992
Earlier work this paper cites.
M. S. Turner, M. J. White and J. E. Lidsey, Phys. Rev. D 48
1993
Earlier work this paper cites.
B. Caron et al., Class. Quant. Grav. 14
1997
Earlier work this paper cites.
H. Lück et al., Class. Quant. Grav. 14
1997
Earlier work this paper cites.
M. Giovannini, Phys. Rev. D 58
1998
Earlier work this paper cites.
M. Giovannini, Class. Quant. Grav. 16
1999
Earlier work this paper cites.
P. J. E. Peebles and A. Vilenkin, Phys. Rev. D 59
1999
Earlier work this paper cites.
M. Giovannini, Phys. Rev. D 73
1999
Earlier work this paper cites.
B. Allen and J. D. Romano, Phys. Rev. D 59
1999
Cited alongside, same era.
M. Ando et al., Phys. Rev. Lett. 86
2001
Cited alongside, same era.
D. Babusci and M. Giovannini, Phys. Rev. D 60
2001
Cited alongside, same era.
M. Giovannini, H. Kurki-Suonio and E. Sihvola, Phys. Rev. D 66
2002
Cited alongside, same era.
A. R. Liddle and S. M. Leach, Phys. Rev. D 68
2003
Cited alongside, same era.
A. M. Cruise, Class. Quantum Grav. 17
2003
Cited alongside, same era.
D. J. Eisenstein et al
2004
F. Pegoraro, L. A. Radicati, Ph. Bernard, and E. Picasso, Phys. Lett. A 68
2004
Later among the works it cites.
W. L. Freedman et al
2005
Later among the works it cites.
S. Weinberg, Phys. Rev. D 69
2005
Later among the works it cites.
P. Astier et al
2006
Later among the works it cites.
W. Zhao and Y. Zhang, Phys. Rev. D 74
2006
Later among the works it cites.
Y. Watanabe and E. Komatsu, Phys. Rev. D 73
2006
Later among the works it cites.
S. Chongchitnan and G. Efstathiou, Phys. Rev. D 73
2006
Later among the works it cites.
alphaXiv searches the wider corpus for related work and actual follow-ups.
alphaXiv is searching for related work…
Cited alongside, same era.
A. G. Riess et al
2004
Cited alongside, same era.
M. Giovannini, Int. J. Mod. Phys. D 13
2004
Cited alongside, same era.
V. Sahni, M. Sami and T. Souradeep, Phys. Rev. D 65
2004
Cited alongside, same era.
Cited in the paper.
Cited in the paper.
F. A. Jenet et al
2006
Later among the works it cites.
G. Ellis, R. Maartens and M. A. H. MacCallum, Gen. Rel. Grav. 39
2007
Later among the works it cites.
B. Abbott et al
2008
Closest in time.