58 citations · 315 across the 15 of their papers we have counts for
6 papers · 1 filter
The black hole dynamical horizon and generalized second law of thermodynamics
Song He, Hongbao Zhang
The generalized second law of thermodynamics for a system containing a black hole dynamical horizon is proposed in a covariant way. Its validity is also tested in case of adiabatic…
Covariant entropy conjecture and concordance cosmological models
Song He, Hongbao Zhang
Recently a covariant entropy conjecture has been proposed for dynamical horizons. We apply this conjecture to concordance cosmological models, namely, those cosmological models fil…
A covariant entropy conjecture on cosmological dynamical horizon
Song He, Hongbao Zhang
We here propose a covariant entropy conjecture on cosmological dynamical horizon. After the formulation of our conjecture, we test its validity in adiabatically expanding universes…
Exploring holographic dark energy model with Sandage-Loeb test
Hongbao Zhang, Wuhan Zhong, Zong-Hong Zhu +1
Taking into account that Sandage-Loeb test is unique in its coverage of the redshift desert and available in the near future, we explore the cosmic time evolution behavior of the s…
Entanglement Entropy: Helicity versus Spin
Song He, Shuxin Shao, Hongbao Zhang
For a massive spin 1/2 field, we present the reduced spin and helicity density matrix, respectively, for the same pure one particle state. Their relation has also been developed. F…
Quantum Helicity Entropy of Moving Bodies
Song He, Shuxin Shao, Hongbao Zhang
Lorentz transformation of the reduced helicity density matrix for a massive spin 1/2 particle is investigated in the framework of relativistic quantum information theory for the fi…