Vector dark energy models with quadratic terms in the Maxwell tensor derivatives
نویسندگان
چکیده
منابع مشابه
Vector Models for Dark Energy
We explore the possibility that the present stage of accelerated expansion of the universe is due to the presence of a cosmic vector field. We show that vector theories allow for the generation of an accelerated phase without the introduction of potential terms or unnatural scales in the Lagrangian. We propose a particular model with the same number of parameters as ΛCDM and excellent fits to S...
متن کاملDark energy in vector-tensor theories of gravity
We consider a general class of vector-tensor theories of gravity and show that solutions with accelerated expansion and a future type III singularity are a common feature in these models. We also show that there are only six vector-tensor theories with the same small scales behaviour as General Relativity and, in addition, only two of them can be made completely free from instabilities. Finally...
متن کاملThe Dark Energy in Scalar-tensor Cosmology
Recent observations confirm that our universe is flat and consists of a dark energy component with negative pressure. This dark energy is responsible for the recent cosmic acceleration as well as determines the feature of future evolution of the universe. In this paper, we discuss the dark energy of the universe in the framework of scalar-tensor cosmology. In the very early universe, the gravit...
متن کاملVector Field Models of Inflation and Dark Energy
Vector field models of inflation and dark energy are investigated. We consider nonminimal couplings of the vectors both in the matter and in the gravity sector. The cosmological equations, allowing anisotropic background expansion, are then studied as a dynamical system. We show the general conditions for the existence of scaling solutions for spatial fields. A vector with an inverse power-law ...
متن کاملAvoiding the dark energy coincidence problem with a cosmic vector
We show that vector theories on cosmological scales are excellent candidates for dark energy. We consider two different examples, both are theories with no dimensional parameters nor potential terms, with natural initial conditions in the early universe and the same number of free parameters as ΛCDM. The first one exhibits scaling behaviour during radiation and a strong phantom phase today, end...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2017
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-017-4697-9