Hu and Parker 1977

Hu, B.L., and L. Parker, 1977: Effect of gravitation creation in isotropically expanding universes. Phys. Lett. A, 63, 217-220, doi:10.1016/0375-9601(77)90880-5.

Graviton creation in a Robertson-Walker universe is calculated using a renormalized energy-momentum tensor. If the background matter has an equation of state p = γρ, then for γ > 1/3, graviton energy created near the Planck time t_p can alter the expansion to a ~ t^1/2 in ≲ 10²t₂.

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Hu, B.L., and Parker, L.: Effect of gravitation creation in isotropically expanding universes, Phys. Lett. A, 63, 217-220, doi:10.1016/0375-9601(77)90880-5, 1977.

Hu, B.L., and L. Parker (1977), Effect of gravitation creation in isotropically expanding universes, Phys. Lett. A, 63, 217-220, doi:10.1016/0375-9601(77)90880-5.

Hu, B.L., and L. Parker, 1977: Effect of gravitation creation in isotropically expanding universes. Phys. Lett. A, 63, 217-220, doi:10.1016/0375-9601(77)90880-5.

Hu, B.L., & Parker, L. 1977, Phys. Lett. A, 63, 217, doi:10.1016/0375-9601(77)90880-5.

Hu BL, Parker L. Effect of gravitation creation in isotropically expanding universes, Phys Lett A 1977;63:217-220. doi:10.1016/0375-9601(77)90880-5.

B.L. Hu, L. Parker, Phys. Lett. A 63, 217-220, doi:10.1016/0375-9601(77)90880-5 (1977).