Kavli Affiliate: Pau Amaro Seoane
| First 5 Authors: Rui Xu, Dandan Xu, Lars Andersson, Pau Amaro Seoane, Lijing Shao
| Summary:
We put into test the idea of replacing dark energy by a vector field against
the cosmic microwave background (CMB) observation using the simplest
vector-tensor theory, where a massive vector field couples to the Ricci scalar
and the Ricci tensor quadratically. First, a remarkable
Friedmann-Lema^{i}tre-Robertson-Walker (FLRW) metric solution that is
completely independent of the matter-energy compositions of the universe is
found. Second, based on the FLRW solution as well as the perturbation
equations, a numerical code calculating the CMB temperature power spectrum is
built. We find that though the FLRW solution can mimic the evolution of the
universe in the standard $Lambda$CDM model, the calculated CMB temperature
power spectrum shows unavoidable discrepancies from the CMB power spectrum
measurements.
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