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Braneworld models have been proposed as a possible solution to the problem ofthe accelerated expansion of the Universe. The idea is to dispense the darkenergy (DE) and drive the late-time cosmic acceleration with a five-dimensionalgeometry. Here, we investigate a brane model with variable brane tension as afunction of redshift called chrono-brane. We propose the polynomial$\lambda=(1+z)^{n}$ function inspired in tracker-scalar-field potentials. Toconstrain the $n$ exponent we use the latest observational Hubble data fromcosmic chronometers, Type Ia Supernovae from the full JLA sample, baryonacoustic oscillations and the posterior distance from the cosmic microwavebackground of Planck 2015 measurements. A joint analysis of these dataestimates $n\simeq6.19$ which generates a DE-like or cosmological-constant-liketerm, in the Friedmann equation arising from the extra dimensions. This modelis consistent with these data and can drive the Universe to an acceleratedphase at late times.

Brane with variable tension as a possible solution to the problem of the late cosmic acceleration