Gravitational lensing is the deflection of the trajectory of a photon by gravity, and it is a natural consequence of the theory of General Relativity. Lensing distorts the shapes and orientations of galaxies and in today’s post, we discuss a new method to reconstruct dark matter maps of our Universe using the position angles of galaxies.
How quickly did the Universe become reionized? And how do we know? Find out with Hubble in today’s paper.
New results from stacked weak lensing measurements of over a hundred thousand galaxies show that, on large scales, light from stars appears to trace the dark matter distribution of the Universe remarkably well.
The authors raise a key point about the detection of gravitational waves from the early universe. Not only would such a detection verify the theory of inflation, but it would also prove the quantization of gravity.
A relatively detailed discussion of a classic paper in cosmology, which basically covers everything you might want to know about how structure forms in the Universe on the very largest scales.
Our special guest astrophysical classics series on Gunn & Peterson 1965 concludes with an examination — and apprehension — of the suspects responsible for reionization.
Measurements of the circular velocities in groups of galaxies can test whether our current cosmology is correct.
Gravitational lensing causes distortions in the polarization of the Cosmic Microwave Background. In this astrobite, we discuss recent results from the South Pole Telescope collaboration measuring patterns caused by lensing in the CMB polarization. What do these patterns tell us about the Universe?