Jerk, snap and the cosmological equation of state
نویسندگان
چکیده
منابع مشابه
Jerk, snap and the cosmological equation of state
Taylor expanding the cosmological equation of state around the current epoch p = p0 + κ0(ρ − ρ0) + 1 2 d2p dρ2 ∣∣∣ 0 (ρ − ρ0) + O[(ρ − ρ0)], is the simplest model one can consider that does not make any a priori restrictions on the nature of the cosmological fluid. Most popular cosmological models attempt to be ‘predictive’, in the sense that once some a priori equation of state is chosen the F...
متن کاملJerk and the cosmological equation of state
Abstract. Linearizing the cosmological equation of state around the current epoch p = p0 + κ0 (ρ− ρ0) +O[(p− p0)2], is the simplest model one can consider that does not make any a priori restrictions on the nature of the cosmological fluid. Most popular cosmological models attempt to be “predictive”, in the sense that once some a priori equation of state is chosen the Friedmann equations are us...
متن کاملCosmic Jerk, Snap and Beyond
We clarify the procedure for expressing the Friedmann equation in terms of directly measurable cosmological scalars constructed out of higher derivatives of the scale factor. We carry out this procedure for pure dust, Chaplygin gas and generalised Chaplygin gas energy–momentum tensors. In each case it leads to a constraint on the scalars thus giving rise to a test of General Relativity. We also...
متن کاملAcoustic Peak Spacing, Cosmological Density, and Equation of State
The spacing of the acoustic peaks in the cosmic microwave background radiation anisotropy multipole spectrum has been claimed to provide the value of the total cosmological density overtly, “written on the sky.” Through a semianalytic analysis of the cosmological evolution of the sound horizon and the physics of decoupling we address the robustness of the relation between the peak spacing and t...
متن کاملThe Modified Lennard-Jones and Devonshire Equation of State
Lennard-Jones-Devonshire equation of state is an old but theoretical based EOS. The concept of the nearest neighboring molecules or coordination number is proposed to be a function of temperature and volume, whereas it is a constant in the original. The dilute gas and hard sphere limits of molecules are employed to determine this function. Improvement of this modification is demonstrated by pro...
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: Classical and Quantum Gravity
سال: 2004
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/21/11/006