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Constraining Ultralight Axions with Galaxy Surveys
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abstract
Ultralight axions and other bosons are dark matter candidates present in many high energy physics theories beyond the Standard Model. In particular, the string axiverse postulates the existence of up to $\mathcal{O}(100)$ light scalar bosons constituting the dark sector. Considering a mixture of axions and cold dark matter, we obtain upper bounds for the axion relic density $\Omega_a h^2 < 0.004$ for axions of mass $10^{-31}\;\mathrm{eV}\leq m_a \leq 10^{-26}\;\mathrm{eV}$ at 95% confidence. We also improve existing constraints by a factor of over 4.5 and 2.1 for axion masses of $10^{-25}$ eV and $10^{-32}$ eV, respectively. We use the Fourier-space galaxy clustering statistics from the Baryon Oscillation Spectroscopic Survey (BOSS) and demonstrate how galaxy surveys break important degeneracies in the axion parameter space compared to the cosmic microwave background (CMB). We test the validity of the effective field theory of large-scale structure approach to mixed ultralight axion dark matter by making our own mock galaxy catalogs and find an anisotropic ultralight axion signature in the galaxy quadrupole. We also observe an enhancement of the linear galaxy bias from 1.8 to 2.4 when allowing for 5% of the dark matter to be composed of a $10^{-28}$ eV axion in our simulations. Finally, we develop an augmented interpolation scheme allowing a fast computation of the axion contribution to the linear matter power spectrum leading to a 70% reduction of the computational cost for the full Monte Carlo Markov chains analysis.
Forward citations
Cited by 7 Pith papers
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Fuzzy Axions and Associated Relics
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Accurate axion-isocurvature evolution across the full ultralight mass range converts Planck and BICEP bounds into inflation-scale limits and reveals a small discovery window near m_a ~ 10^-25 eV.
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Searching for coupled, hyperlight scalars across cosmic history
Hyperlight quadratically coupled scalars making up a few percent of dark matter are bounded to near- or sub-gravitational couplings to electrons and photons over 10^-31 to 10^-28 eV, with quasar spectra setting the st...
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Bracketing the soliton-halo relation of ultralight dark matter
Numerical simulations and analytic equivalences show that the soliton-halo relation for ultralight dark matter is bracketed by the 1/2 relation as a lower bound and the 1/3 relation as an upper bound.
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Minimal Magnetogenesis: The Role of Inflationary Perturbations and ALPs, and Its Gravitational Wave Signatures
Inflationary curvature perturbations seed weak magnetic fields, and post-recombination axion oscillations amplify them to observed levels while sourcing detectable secondary gravitational waves.
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Lensed fast radio bursts as a probe of time-varying gravitational potential induced by wave dark matter
Wave dark matter halo fluctuations would stretch lensed FRB signals by about 10^-10, a drift that one year of monitoring lensed repeating bursts could detect.
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Reconstructing the shape of the non-linear matter power spectrum using CMB lensing and cosmic shear
A joint ACT DR6 + DES Y3 analysis reconstructs the non-linear matter power spectrum in five k-bins and finds marginal, roughly 2 sigma evidence for scale-dependent suppression that baryonic feedback or ultralight axio...
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