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Probing beyond-Horndeski gravity on ultra-large scales
| Content Provider | Semantic Scholar |
|---|---|
| Author | Duniya, Didam Moloi, Teboho Clarkson, Chris S. Larena, Julien Maartens, R. G. Mongwane, Bishop Weltman, Amanda |
| Copyright Year | 2019 |
| Abstract | The beyond-Horndeski gravity has recently been reformulated in the dark energy paradigm - which has been d믭, Unified Dark Energy (UDE). The evolution equations for the given UDE appear to correspond to a non-conservative dark energy scenario, in which the total energy-momentum tensor is not conserved. We investigate both the background cosmology and, the large-scale imprint of the UDE by probing the angular power spectrum of galaxy number counts, on ultra-large scales; taking care to include the full relativistic corrections in the observed overdensity. The background evolution shows that only an effective mass smaller than the Planck mass is needed in the early universe in order for predictions in the given theory to match current observational constraints. We found that the effective mass-evolution-rate parameter, which drives the evolution of the UDE, acts to enhance the observed power spectrum and, hence, relativistic effects (on ultra-large scales) by enlarging the UDE sound horizon. Conversely, both the beyond-Horndeski parameter and the kineticity act to diminish the observed power spectrum, by decreasing the UDE sound horizon. We also found that while the Doppler effect remains significant at all epochs and, thus can not be ignored, the integrated Sachs-Wolfe, the time-delay and the potential (difference) effects, respectively, only become significant at epochs near z = 3 and beyond, and may be neglected at late epochs. The results show that relativistic effects may hold the potential to distinguish different gravity models and, may be important in putting constraints on the degrees of freedom of the models. Moreover, the Doppler effect alone, can be used as an effective cosmological probe for the large scale structure and gravity models - at all epochs. |
| File Format | PDF HTM / HTML |
| DOI | 10.1088/1475-7516/2020/01/033 |
| Alternate Webpage(s) | https://arxiv.org/pdf/1902.09919v2.pdf |
| Alternate Webpage(s) | https://doi.org/10.1088/1475-7516%2F2020%2F01%2F033 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
