The paper claims that enforcing four-velocity normalization makes modified-gravity field equations independent of the matter-Lagrangian choice, with illustrative compact-star and cosmology results.
The Luminous and Carbon-Rich Supernova 2006gz: A Double Degenerate Merger?
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abstract
Spectra and light curves of SN 2006gz show the strongest signature of unburned carbon and one of the slowest fading light curves ever seen in a type Ia event (Delta m_15 = 0.69 +/- 0.04). The early-time Si II velocity is low, implying it was slowed by an envelope of unburned material. Our best estimate of the luminosity implies M_V = -19.74 and the production of ~ 1.2 M_sun of 56Ni. This suggests a super-Chandrasekhar mass progenitor. A double degenerate merger is consistent with these observations.
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Ambiguity in matter sector for modified gravity involving $\delta^2 \mathcal{L}_{m}/\delta g^{\mu\nu}\delta g^{\alpha\beta}$ and its implications to astrophysics and cosmology
The paper claims that enforcing four-velocity normalization makes modified-gravity field equations independent of the matter-Lagrangian choice, with illustrative compact-star and cosmology results.