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5 papers · 2 filters
Friedmann equations in braneworld scenarios from emergence of cosmic space
A. Sheykhi, M. H. Dehghani, S. E. Hosseini
Recently, it was argued that the spacetime dynamics can be understood by calculating the difference between the degrees of freedom on the boundary and in the bulk in a region of sp…
Quartic Quasi-topological Gravity, Black Holes and Holography
M. H. Dehghani, M. H. Vahidinia
In this paper, we derive the field equations of quartic quasi-topological gravity by varying the action with respect to the metric. Also, we obtain the linearized graviton equation…
Thermodynamics of Quasi-Topological Cosmology
M. H. Dehghani, A. Sheykhi, R. Dehghani
In this paper, we study thermodynamical properties of the apparent horizon in a universe governed by quasi-topological gravity. Our aim is twofold. First, by using the variational…
Lifshitz black brane thermodynamics in the presence of a nonlinear electromagnetic field
M. H. Dehghani, Ch. Shakuri, M. H. Vahidinia
In this paper, we investigate the thermodynamics of Lifshitz black branes in the presence of a nonlinear massless electromagnetic field. We begin by introducing the appropriate act…
Thermodynamics of the apparent horizon in infrared modified Horava-Lifshitz gravity
Ahmad Sheykhi
It is well known that by applying the first law of thermodynamics to the apparent horizon of a Friedmann-Robertson-Walker universe, one can derive the corresponding Friedmann equat…