Variable sound speed in interacting dark energy models
Variable sound speed in interacting dark energy models
复制标题
相互作用的暗能量模型中的可变声速
DOI:
10.1088/1475-7516/2018/04/043
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发表时间:
2018
影响因子:
6.4
通讯作者:
Linton M
中科院分区:
文献类型:
--
作者:
Linton M
We consider a self-consistent and physical approach to interacting dark energy models described by a Lagrangian, and identify a new class of models with variable dark energy sound speed. We show that if the interaction between dark energy in the form of quintessence and cold dark matter is purely momentum exchange this generally leads to a dark energy sound speed that deviates from unity. Choosing a specific sub-case, we study its phenomenology by investigating the effects of the interaction on the cosmic microwave background and linear matter power spectrum. We also perform a global fitting of cosmological parameters using CMB data, and compare our findings to ΛCDM.
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