| KLUSOŇ, Josef, masud CHACHIAN, Markku OKSANEN a Anca TUREANU. Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity. Journal of High Energy Physics (JHEP). Institute of Physics, roč. 2014, č. 12, s. "nestrankovano", 22 s. ISSN 1126-6708. doi:10.1007/JHEP12(2014)102. 2014. |
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@article{1232490,
author = {Klusoň, Josef and chachian, masud and Oksanen, Markku and Tureanu, Anca},
article_number = {12},
doi = {http://dx.doi.org/10.1007/JHEP12(2014)102},
keywords = {Dark energy; Hamiltonian Formalism},
language = {eng},
issn = {1126-6708},
journal = {Journal of High Energy Physics (JHEP)},
title = {Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity},
volume = {2014},
year = {2014}
}
TY - JOUR
ID - 1232490
AU - Klusoň, Josef - chachian, masud - Oksanen, Markku - Tureanu, Anca
PY - 2014
TI - Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity
JF - Journal of High Energy Physics (JHEP)
VL - 2014
IS - 12
SP - "nestrankovano"
EP - "nestrankovano"
PB - Institute of Physics
SN - 11266708
KW - Dark energy
KW - Hamiltonian Formalism
N2 - Recently modified gravitational theories which mimic the behaviour of dark matter, the so-called “Mimetic Dark Matter”, have been proposed. We study the consistency of such theories with respect to the absence of ghost instability and propose a new tensor-vector-scalar theory of gravity, which is a generalization of the previous models of mimetic dark matter with additional desirable features. The original model proposed by Chamseddine and Mukhanov [JHEP 11 (2013) 135] is concluded to describe a regular pressureless dust, presuming that we consider only those configurations where the energy density of the mimetic dust remains positive under time evolution. For certain type of configurations the theory can become unstable. Both alternative modified theories of gravity, which are based on a vector field (tensor-vector theory) or a vector field and a scalar field (tensor-vector-scalar theory), are free of ghost instabilities.
ER -
KLUSOŇ, Josef, masud CHACHIAN, Markku OKSANEN a Anca TUREANU. Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity. \textit{Journal of High Energy Physics (JHEP)}. Institute of Physics, roč.~2014, č.~12, s.~''nestrankovano'', 22 s. ISSN~1126-6708. doi:10.1007/JHEP12(2014)102. 2014.
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