Modifications of general relativity provide an alternative explanation to dark energy for the
observed acceleration of the universe. We review recent developments in modified gravity …

We have used the E p, i–E iso correlation of gamma-ray bursts (GRBs) to measure the
cosmological parameter ΩM. By adopting a maximum likelihood approach which allows us …

Although general relativity underlies modern cosmology, its applicability on cosmological
length scales has yet to be stringently tested. Such a test has recently been proposed, using …

We search for viable f (R) theories of gravity, making use of the equivalence between such
theories and scalar-tensor gravity. We find that models can be made consistent with solar …

Dark energy and dark matter are the dominant sources in the evolution of the late universe.
They are currently only indirectly detected via their gravitational effects, and there could be a …

We present a new method that simultaneously solves for cosmology and galaxy bias on non-
linear scales. The method uses the halo model to analytically describe the (non-linear) …

The core–cusp problem is one of the controversial issues in the standard paradigm of Λ cold
dark matter (ΛCDM) theory. However, under the assumption of conventional spherical …

Measuring the statistics of galaxy peculiar velocities using redshift-space distortions is an
excellent way of probing the history of structure formation. Because galaxies are expected to …

Gravitational lensing of the cosmic microwave background (CMB), a long-standing
prediction of the standard cosmological model, is ultimately expected to be an important …

We extend the general relativistic description of galaxy clustering developed in Yoo,
Fitzpatrick, and Zaldarriaga (2009). For the first time we provide a fully general relativistic …