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2019

Generalized Brans-Dicke theories in light of evolving dark energy

Zucca, Alex, Pogosian, Levon, Silvestri, Alessandra et al.

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The expansion history of the Universe reconstructed from a combination of recent data indicates a preference for a changing Dark Energy (DE) density.

Moreover, the DE density appears to be increasing with cosmic time, with its equation of state being below -1 on average, and possibly crossing the so-called phantom divide.
Scalar-tensor theories, in which the scalar field mediates a force between matter particles, offer a natural framework in which the effective DE equation of state can be less than -1 and cross the phantom barrier.
We consider the generalized Brans-Dicke (GBD) class of scalar-tensor theories and reconstruct their Lagrangian given the effective DE density extracted from recent data.

Generalized Brans-Dicke theories in light of evolving dark energy · Around

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