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Natural Emergence of Cosmological Constant and Dark Radiation from Stephenson-Kilmister-Yang-Camenzind Theory of Gravity
Pisin Chen, Keisuke Izumi, Nien-En Tung
We show that the Stephenson-Kilmister-Yang (SKY) equation combined with Camenzind's matter current term naturally provides the cosmological constant and dark radiation as integrati…
Problems with Propagation and Time Evolution in f(T) Gravity
Yen Chin Ong, Keisuke Izumi, James M. Nester +1
Teleparallel theories of gravity have a long history. They include a special case referred to as the Teleparallel Equivalent of General Relativity (TEGR, aka GR). Recently t…
Is Eddington-Born-Infeld theory really free of cosmological singularities?
Mariam Bouhmadi-Lopez, Che-Yu Chen, Pisin Chen
The Eddington-inspired-Born-Infeld (EiBI) theory has been recently resurrected. Such a theory is characterized by being equivalent to Einstein theory in vacuum but differing from i…
Tradeoff between Smoother and Sooner "Little Rip"
Mariam Bouhmadi-Lopez, Pisin Chen, Yen-Wei Liu
There exists dark energy models that predict the occurrence of "little rip". At the point of little rip the Hubble rate and its cosmic time derivative approach infinity, which is q…