Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F14%3A00074487" target="_blank" >RIV/00216224:14310/14:00074487 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/JHEP12(2014)102" target="_blank" >http://dx.doi.org/10.1007/JHEP12(2014)102</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP12(2014)102" target="_blank" >10.1007/JHEP12(2014)102</a>
Alternative languages
Result language
angličtina
Original language name
Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity
Original language description
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 regularpressureless 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.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BE - Theoretical physics
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GBP201%2F12%2FG028" target="_blank" >GBP201/12/G028: Eduard Čech Institute for algebra, geometry and mathematical physics</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of High Energy Physics (JHEP)
ISSN
1126-6708
e-ISSN
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Volume of the periodical
2014
Issue of the periodical within the volume
12
Country of publishing house
US - UNITED STATES
Number of pages
22
Pages from-to
"nestrankovano"
UT code for WoS article
000346590300001
EID of the result in the Scopus database
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