Constraining ultralight axions with galaxy surveys

Ultralight axions and other bosons are dark matter candidates present in many high energy physics theories beyond the Standard Model. In particular, string axiverse postulates existence of up to $\mathcal{O}(100)$ light scalar constituting sector. Considering a mixture cold matter, we obtain upper bounds for axion relic density $\Omega_a h^2 < 0.004$ mass $10^{-31}\;\mathrm{eV}\leq m_a \leq 10^{-26}\;\mathrm{eV}$ at 95% confidence. We also improve existing constraints by factor over 4.5 2.1 masses $10^{-25}$ eV $10^{-32}$ eV, respectively. use Fourier-space galaxy clustering statistics from Baryon Oscillation Spectroscopic Survey (BOSS) demonstrate how surveys break important degeneracies parameter space compared cosmic microwave background (CMB). test validity effective field theory large-scale structure approach mixed ultralight making our own mock catalogs find an anisotropic signature quadrupole. observe enhancement linear bias 1.8 2.4 when allowing 5% be composed $10^{-28}$ simulations. Finally, develop augmented interpolation scheme fast computation contribution power spectrum leading 70% reduction computational cost full Monte Carlo Markov chains analysis.