A stable flat universe with variable cosmological constant in f(R, T) gravity
نویسندگان
چکیده
منابع مشابه
Quasar Populations in a Cosmological Constant Dominated Flat Universe
Most physical properties derived for quasars, as single entities or as a population, depend upon the cosmology assumed. In this paper, we calculate the quasar luminosity function and some related quantities for a at universe dominated by a cosmological constant ((= 0:9; = 0:1) and compare them with those deduced for a at universe with zero cosmological constant ((= 0; = 1). We use the AAT quasa...
متن کاملNonvanishing Cosmological Constant of Flat Universe in Brane-World Scenario
The finite temperature effect is examined in Randall-Sundrum brane-world scenario with inclusion of the matter fields on the brane. At zero temperature it is found that the theory on the brane is conformally invariant, which guarantees AdS/CFT. At 4d effective action we derived a temperature-dependent nonvanishing cosmological constant at the flat spacetime limit of brane worldvolume. At the co...
متن کاملAn Analytic Expression for the Growth Function in a Flat Universe with a Cosmological Constant
An analytic expression is given for the growth function for linear perturbations in a low-density universe made flat by a cosmological constant. The result involves elliptic integrals but is otherwise straight-forward. Subject headings: cosmology: theory – large-scale structure of the universe In linear cosmological perturbation theory, the evolution of perturbations in the absence of pressure ...
متن کاملNonlinear evolution of spherical perturbation in a non-flat Universe with cosmological constant
We generalize the spherical collapse model for the formation of bound objects to apply in a Universe with arbitrary positive cosmological constant. We calculate the critical condition for collapse of an overdense region and give exact values of the characteristic densities and redshifts of its evolution.
متن کاملQuantum gravity with a positive cosmological constant
A quantum theory of gravity is described in the case of a positive cosmological constant in 3 + 1 dimensions. Both old and new results are described, which support the case that loop quantum gravity provides a satisfactory quantum theory of gravity. These include the existence of a ground state, discoverd by Kodama, which both is an exact solution to the constraints of quantum gravity and has a...
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: Research in Astronomy and Astrophysics
سال: 2018
ISSN: 1674-4527
DOI: 10.1088/1674-4527/18/10/123