Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 11, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2019/11/044
Keywords
cosmological parameters from CMBR; cosmological simulations; dark energy theory; dark matter theory
Funding
- National Natural Science Foundation of China [11705079, 11647153]
- Mathematical Research Impact Centric Support (MATRICS) [MTR/2018/000940]
- Science and Engineering Research Board, Government of India
- Faculty Research and Professional Development Fund (FRPDF) Scheme of Presidency University, Kolkata, India
- Isaac Newton Trust
- Kavli Foundation through a Newton-Kavli fellowship
- European Research Council [681431]
- Research Council of Norway
- Istituto Nazionale di Fisica Nucleare (INFN), iniziative specifiche QGSKY
- Istituto Nazionale di Fisica Nucleare (INFN), iniziative specifiche MOONLIGHT2
- COST (European Cooperation in Science and Technology) [CA15117]
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While the origin and composition of dark matter and dark energy remains unknown, it is possible that they might represent two manifestations of a single entity, as occurring in unified dark sector models. On the other hand, advances in our understanding of the dark sector of the Universe might arise from Cosmic Dawn, the epoch when the first stars formed. In particular, the first detection of the global 21-cm absorption signal at Cosmic Dawn from the EDGES experiment opens up a new arena wherein to test models of dark matter and dark energy. Here, we consider generalized and modified Chaplygin gas models as candidate unified dark sector models. We first constrain these models against Cosmic Microwave Background data from the Planck satellite, before exploring how the inclusion of the global 21-cm signal measured by EDGES can improve limits on the model parameters, finding that the uncertainties on the parameters of the Chaplygin gas models can be reduced by a factor between 1.5 and 10. We also find that within the generalized Chaplygin gas model, the tension between the CMB and local determinations of the Hubble constant H-0 is reduced from approximate to 4 sigma to approximate to 1.3 sigma. In conclusion, we find that the global 21-cm signal at Cosmic Dawn can provide an extraordinary window onto the physics of unified dark sectors.
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