284 citations · 2.3k across the 55 of their papers we have counts for
8 papers · 1 filter
Biased Tracers and Time Evolution
Mehrdad Mirbabayi, Fabian Schmidt, Matias Zaldarriaga
We study the effect of time evolution on galaxy bias. We argue that at any order in perturbations, the galaxy density contrast can be expressed in terms of a finite set of locally…
Massive Gravity: A Lorentz-Symmetric Aether
Mehrdad Mirbabayi
This is a heuristic introduction to massive gravity based on an analogy with perfect fluids. I will argue that massive gravity can be thought of as Einstein gravity in the presence…
Baryon Acoustic Peak and the Squeezed Limit Bispectrum
Mehrdad Mirbabayi, Marko Simonović, Matias Zaldarriaga
In the non-relativistic regime, pertinent to the large scale structure of the Universe, the leading effect of a long-wavelength perturbation on short distance physics is a…
Gravitational Waves and the Scale of Inflation
Mehrdad Mirbabayi, Leonardo Senatore, Eva Silverstein +1
We revisit alternative mechanisms of gravitational wave production during inflation and argue that they generically emit a non-negligible amount of scalar fluctuations. We find the…
Double Soft Limits of Cosmological Correlations
Mehrdad Mirbabayi, Matias Zaldarriaga
Correlation functions of two long-wavelength modes with several short-wavelength modes are shown to be related to lower order correlation functions, using the background wave metho…
CMB Anisotropies from a Gradient Mode
Mehrdad Mirbabayi, Matias Zaldarriaga
A linear gradient mode must have no observable dynamical effect on short distance physics. We confirm this by showing that if there was such a gradient mode extending across the wh…