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

Abstract

Braneworld models have been proposed as a possible solution to the problem of the accelerated expansion of the Universe. The idea is to dispense the dark energy (DE) and drive the late-time cosmic acceleration with a five-dimensional geometry. Here, we investigate a brane model with variable brane tension as a function of redshift called chrono-brane. We propose the polynomial λ = (1 + z) n function inspired in tracker-scalar-field potentials. To constrain the n exponent we use the latest observational Hubble data from cosmic chronometers, Type Ia Supernovae from the full JLA sample, baryon acoustic oscillations and the posterior distance from the cosmic microwave background of Planck 2015 measurements. A joint analysis of these data estimates n 6.19 which generates a DE-like or cosmological-constant-like term, in the Friedmann equation arising from the extra dimensions. This model is consistent with these data and can drive the Universe to an accelerated phase at late times. PACS numbers: 04.50.-h,98.80.-k

Stability analysis and constraints on interacting viscous cosmology

“…4. We estimate the current values of the cosmographic parameters as q 0 = −0.55 +0.06 −0.05 , −0.58 +0.05 −0.04 , −0.58 +0.05 −0.05 , −0.63 +0.02 −0.02 and j 0 = 0.87 +0.06 −0.09 , 0.94 +0.04 −0.06 , 0.91 +0.06 −0.10 , 1.0, for the IVM, VM, IM, and LCDM respectively, which are in agreement with those reported in the literature considering other models [12,48]. Finally, although our results on BIC suggest the models used are unfavourable over LCDM standard paradigm, they give an alternative to alleviate the CC problems by adding some degree of freedom to LCDM.…”

“…Regarding the cosmographic parameters, we obtain the deceleration one at z = 0 to be q 0 = −0.55 +0.06 −0.05 , −0.58 +0.05 −0.04 , −0.58 +0.05 −0.05 , and −0.63 +0.02 −0.02 for the IVM, VM, IM, and LCDM respectively. When we compare these results with the one obtained by [12] for the LCDM model, values with those obtained by [48] considering viscous models, we find a deviation of about 1.3σ. Additionally, we find a deviation on q 0 within 1.2σ for IVM, IV, and VM to the one value obtained in [76].…”

“…[75] using the non-parametric Gaussian Process method with the OHD data, z T = 0.59 +0.12 −0.11 ,and SNIa Pantheon sample, z T = 0.683 +0.110 −0.082 , and also the one value found by [76], z T = 0.64 +0. 12 −0.09 when perform an extension of the standard Gaussian Process to Supernovae Type-Ia, BAO and Cosmic Chronometers data.…”

“…(see Refs. [9,10] for some reviews of DE models, also see [11][12][13][14][15][16]). Despite the efforts of the community, the supersymetric DM and CC as dark energy are still the best candidates to understand the cosmological observations.…”

The possibility of a stable flat dark energy-dominated Swiss-cheese brane-world universe

“…The effect of one extra dimension on the background cosmology and the dark energy properties has been investigated in [38]. The idea of using a brane with variable tension to probe the late-time cosmic acceleration has been proposed in [39]. The cosmic inflation driven by a dilaton-like gravitational field in the bulk has been studied in [40].…”