Dark Energy Radiation
| Autor: | Surjeet Rajendran, David E. Kaplan, Peter W. Graham, Kim V. Berghaus, Guy D. Moore |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
High Energy Physics - Theory Photon Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics Cosmic microwave background FOS: Physical sciences Lambda-CDM model Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 7. Clean energy 01 natural sciences Standard Model High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Theory (hep-th) 13. Climate action Dark radiation 0103 physical sciences Dark energy Neutrino 010306 general physics Scalar field Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review |
| Popis: | We show that if dark energy evolves in time, its dynamical component could be dominated by a bath of dark radiation. Within current constraints this radiation could have up to $\sim 10^4$ times more energy density than the cosmic microwave background. We demonstrate particular models in which a rolling scalar field generates different forms of dark radiation such as hidden photons, milli-charged particles and even Standard Model neutrinos. We find the leading effect on the late-time cosmological expansion history depends on a single parameter beyond $\Lambda$CDM, namely the temperature of the dark radiation today. Cosmological observations of this modified expansion rate could provide a striking signature of this scenario. The dark radiation itself could even be directly detectable in laboratory experiments, suggesting a broader experimental program into the nature of dark energy. Comment: 12 pages, 1 Figure |
| Databáze: | OpenAIRE |
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