# The Modern Physics of Compact Stars and Relativistic Gravity 2015

30 September 2015 to 3 October 2015
Yerevan, Armenia
Etc/GMT+4 timezone

## Late stage of the Universe evolution taking into account the vacuum effects

1 Oct 2015, 14:56
38m
Small Hall, Guesthouse ()

### Speaker

Anna Kotanjyan (Yerevan State University)

### Description

The investigations of quantum vacuum effects indicate that in the phenomenology they are responsible for the existence of the cosmological constant $\Lambda$, and besides in the early de Sitter model one has $\Lambda\sim H^4$ ($H$- is the Hubble parameter), whereas for the vacuum energy induced by QCD condensate at late times $\Lambda\sim H$. In the present work, on the base of the modified Jordan theory, we consider models of the expanding Universe with a cosmological scalar $\varphi (y)=\alpha H^{2}$. For different values of the coupling constants $\xi$ the values of the parameter $\alpha$ are obtained corresponding to an accelerated expansion.

### Primary author

Anna Kotanjyan (Yerevan State University)

### Co-authors

Prof. Edvard Chubaryan (Yerevan State University) Prof. Gohar Harutyunyan (Yerevan State University) Prof. Roland Avagyan (Yerevan State University) Prof. Sergey Sushkov (Kazan Federal University)

### Presentation Materials

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