Practical tools for third order cosmological perturbations
نویسندگان
چکیده
منابع مشابه
Evolution of second-order cosmological perturbations
We present a method for constructing gauge-invariant cosmological perturbations which are gaugeinvariant up to second order. As an example we give the gauge-invariant definition of the second order curvature perturbation on uniform density hypersurfaces. Using only the energy conservation equation we show that this curvature perturbation is conserved at second order on large scales for adiabati...
متن کاملCosmological perturbations
We review the study of inhomogeneous perturbations about a homogeneous and isotropic background cosmology. We adopt a coordinate based approach, but give geometrical interpretations of metric perturbations in terms of the expansion, shear and curvature of constant-time hypersurfaces and the orthogonal timelike vector field. We give the gauge transformation rules for metric and matter variables ...
متن کاملGauge-invariant Formulation of the Second-order Cosmological Perturbations
Gauge invariant treatments of the second order cosmological perturbation in a four dimensional homogeneous isotropic universe filled with the perfect fluid are completely formulated without any gauge fixing. We derive all components of the Einstein equations in the case where the first order vector and tensor modes are negligible. These equations imply that the tensor and the vector mode of the...
متن کاملCosmological perturbations for imperfect fluids
Interacting fluids, endowed with bulk viscous stresses, are discussed in a unified perspective with the aim of generalizing the treatment of cosmological perturbation theory to the case where both fluctuating decay rates and fluctuating bulk viscosity coefficients are simultaneously present in the relativistic plasma. A gauge-invariant treatment of the qualitatively new phenomena arising in thi...
متن کاملCosmological perturbations in a gravity with quadratic order curvature couplings
where Lm is the matter part Lagrangian. The gravitational field equation is presented in Eq. (2) of [1]. The oneloop order quantum correction generically leads to curvature-square terms, and due to Gauss-Bonnet theorem the two terms in Eq. (1) completely account such corrections, [3]. In the literature, many works analyzed the roles of R term in the context of cosmological structure formation, ...
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: Journal of Cosmology and Astroparticle Physics
سال: 2009
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2009/11/012