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A Parameterized Post-Friedmann Framework for Modified Gravity
Wayne Hu, Ignacy Sawicki
We develop a parameterized post-Friedmann (PPF) framework which describes three regimes of modified gravity models that accelerate the expansion without dark energy. On large scale…
Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
Wayne Hu, Ignacy Sawicki
We study a class of metric-variation f(R) models that accelerates the expansion without a cosmological constant and satisfies both cosmological and solar-system tests in the small-…
Stability of Cosmological Solution in f(R) Models of Gravity
Ignacy Sawicki, Wayne Hu
We reconcile seemingly conflicting statements in the literature about the behavior of cosmological solutions in modified theories of gravity where the Einstein-Hilbert Lagrangian f…
The Large Scale Structure of f(R) Gravity
Yong-Seon Song, Wayne Hu, Ignacy Sawicki
We study the evolution of linear cosmological perturbations in f(R) models of accelerated expansion in the physical frame where the gravitational dynamics are fourth order and the…
Large-Scale Tests of the DGP Model
Yong-Seon Song, Ignacy Sawicki, Wayne Hu
The self-accelerating braneworld model (DGP) can be tested from measurements of the expansion history of the universe and the formation of structure. Current constraints on the exp…
Near-Horizon Solution for DGP Perturbations
Ignacy Sawicki, Yong-Seon Song, Wayne Hu
We develop a scaling ansatz for the master equation in Dvali, Gabadadze, Porrati cosmologies, which allows us to solve the equations of motion for perturbations off the brane durin…