منابع مشابه
Vector Field Theories in Cosmology I Introduction
Recently proposed theories based on the cosmic presence of a vectorial field are compared and contrasted. In particular the so called Einstein aether theory is discussed in parallel with a recent proposal of a strained space-time theory (Cosmic Defect theory). We show that the latter fits reasonably well the cosmic observed data with only one, or at most two, adjustable parameters, whilst other...
متن کاملThermodynamics of Conformal Field Theories and Cosmology
We study the ratio of the entropy to the total energy in conformal field theories at finite temperature. For the free field realizations of N = 4 super Yang-Mills theory in D = 4 and the (2, 0) tensor multiplet in D = 6, the ratio is bounded from above. The corresponding bounds are less stringent than the recently proposed Verlinde bound. For strongly coupled CFTs with AdS duals, we show that t...
متن کاملVector supersymmetry in topological field theories
We present a simple derivation of vector supersymmetry transformations for topological field theories of Schwarzand Witten-type. Our method is similar to the derivation of BRSTtransformations from the so-called horizontality conditions or Russian formulae. We show that this procedure reproduces in a concise way the known vector supersymmetry transformations of various topological models and we ...
متن کاملEntropy bounds in cosmology and conformal field theories
We study the ratio of the entropy to the total energy in conformal field theories at finite temperature. For the free field realizations of N = 4 super Yang-Mills theory in D = 4 and the (2, 0) tensor multiplet in D = 6, the ratio is bounded from above. The corresponding bounds are less stringent than the recently proposed Verlinde bound. For strongly coupled CFTs with AdS duals, we show that t...
متن کاملEffective Field Theories as Asymptotic Series: From QCD to Cosmology
We present some generic arguments demonstrating that an effective Lagrangian Leff which, by definition, contains operators O n of arbitrary dimensionality in general is not convergent, but rather an asymptotic series. It means that the behavior of the far distant terms has a specific factorial dependence Leff ∼ ∑ n cnO Mn , cn ∼ n!, n ≫ 1. We discuss a few apparently different problems, which h...
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: Physical Review D
سال: 2007
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.76.083501