# What Is the Price of Abandoning Dark Matter? Cosmological Constraints on Alternative Gravity Theories.

@article{Pardo2020WhatIT, title={What Is the Price of Abandoning Dark Matter? Cosmological Constraints on Alternative Gravity Theories.}, author={Kris Pardo and David N. Spergel}, journal={Physical review letters}, year={2020}, volume={125 21}, pages={ 211101 } }

Any successful alternative gravity theory that obviates the need for dark matter must fit our cosmological observations. Measurements of microwave background polarization trace the large-scale baryon velocity field at recombination and show very strong O(1) baryon acoustic oscillations. Measurements of the large-scale structure of galaxies at low redshift show much weaker features in the spectrum. If the alternative gravity theory's dynamical equations for the growth rate of structure are…

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