Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BE - Teoretická fyzika

OECD FORD obor

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Projekt

<a href="/cs/project/GBP201%2F12%2FG028" target="_blank" >GBP201/12/G028: Ústav Eduarda Čecha pro algebru, geometrii a matematickou fyziku</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of High Energy Physics (JHEP)

ISSN

1126-6708

e-ISSN

—

Svazek periodika

2014

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

22

Strana od-do

"nestrankovano"

Kód UT WoS článku

000346590300001

EID výsledku v databázi Scopus

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