Variable brane tension and dark energy

Abstract

In this letter, we show that in a particular braneworld scenario with variable brane tension, we obtain matter acting as dark energy (in the sense that it has an effective Equation of State equivalent to that of dark energy) while a scalar field on the brane plays the role of matter. This result is interpreted from the Friedmann equation obtained from our model that exactly matches the standard Friedmann equation of General Relativity with a cosmological constant Λ in terms of the aforementioned quantities. The universe is assumed to consist of only matter and dark energy in this model which is a good approximation for our universe.