Baryonic effects on CMB lensing and neutrino mass constraints

Chung, Eegene; Foreman, Simon; Engelen, Alexander van

doi:10.1103/physrevd.101.063534

Cited by 23 publications

(37 citation statements)

References 113 publications

(122 reference statements)

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“…In addition to purely gravitational nonlinearities in the growth of structure, the distribution of matter on small scales is also impacted by baryonic effects including supernovae, gas cooling, and feedback from active galactic nuclei. These effects can be modeled in hydrodynamical simulations, but differences among the various implementations lead to a spread of predictions implying a theoretical uncertainty in the small scale matter power spectrum [84][85][86][87][88][89][90][91][92][93][94]. Given the vastly different scales and the uncertain physics involved in these processes, it is unlikely that improved simulations alone will entirely remove this uncertainty.…”

Section: Nonlinear Effectsmentioning

confidence: 99%

“…The effect of nonlinear corrections to the matter power spectrum is totally negligible on these large scales, implying that modeling of the nonlinear matter power spectrum will have only a very small impact on our ability to infer m ν from measurements of CMB lensing. Similarly, baryonic effects on the CMB lensing power spectrum are most prominent on small angular scales [92], and the need for their precise modeling could be obviated by restricting analysis of CMB lensing to large scales without much loss in our ability to measure m ν [93]. Turning this around, a measurement of m ν would allow us to more precisely constrain the amplitude of small scale power predicted by linear theory.…”

Section: Sensitivity To Neutrino Massmentioning

confidence: 99%

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Cosmological Implications of a Neutrino Mass Detection

Green¹,

Meyers²

2021

Preprint

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The next generation of cosmological surveys are expected to measure a non-zero sum of neutrino masses, even down to the minimum value of 58 meV inferred from neutrino flavor oscillation. The implications of such a measurement for the physics of neutrinos have been well documented; in contrast, the cosmological implications of such a measurement have received less attention. In this paper, we explore the impact of a neutrino mass detection consistent with m ν = 58 meV for our understanding of the history and contents of the universe. We focus primarily on three key areas: the thermal history of the universe, clustering of matter on diverse scales, and the application to dark matter and dark sectors. First we show that a detection of non-zero neutrino mass would provide a unique connection between the cosmic neutrino background, which is detected gravitationally, and neutrinos measured on Earth. We then discuss how the consistency of a detection between multiple probes will impact our knowledge of structure formation. Finally, we show how these measurements can be interpreted as sub-percent level tests of dark sector physics.

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Section: Nonlinear Effectsmentioning

confidence: 99%

Section: Sensitivity To Neutrino Massmentioning

confidence: 99%

Cosmological Implications of a Neutrino Mass Detection

Green¹,

Meyers²

2021

Preprint

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“…To be conservative we impose a cut ( < 500) on the lensing angular modes included in our forecasts, but note that this is active area of research and improvements are likely to possible by the time the data arrive [94][95][96][97]. For < 500, baryonic feedback contributes at the subpercent level to the convergence power spectrum [98], while at = 500, only ∼ 15% of the power comes from k > 0.2 h Mpc −1 .…”

Section: Cmb Lensing and Cross-correlationsmentioning

confidence: 99%

Cosmology at high redshift -- a probe of fundamental physics

Sailer,

Castorina,

Ferraro

et al. 2021

Preprint

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An observational program focused on the high redshift (2 < z < 6) Universe has the opportunity to dramatically improve over upcoming LSS and CMB surveys on measurements of both the standard cosmological model and its extensions. Using a Fisher matrix formalism that builds upon recent advances in Lagrangian perturbation theory, we forecast constraints for future spectroscopic and 21-cm surveys on the standard cosmological model, curvature, neutrino mass, relativistic species, primordial features, primordial non-Gaussianity, dynamical dark energy, and gravitational slip. We compare these constraints with those achievable by current or near-future surveys such as DESI and Euclid, all under the same forecasting formalism, and compare our formalism with traditional linear methods. Our Python code FishLSS − used to calculate the Fisher information of the full shape power spectrum, CMB lensing, the cross-correlation of CMB lensing with galaxies, and combinations thereof − is publicly available.

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“…Baryonic effects including supernovae, gas cooling, and feedback from active galactic nuclei also have a significant impact on the distribution of matter on small scales. Hydrodynamical simulations are used to model these effects, though not all simulations agree, meaning that there is a theoretical uncertainty in the small scale matter distribution and thus in the CMB lensing power spectrum [125][126][127][128][129][130][131][132][133][134][135]. Baryonic effects on the CMB lensing power spectrum impact the lensed CMB spectra, and failing to properly account for these feedback effects can lead to biased inferences of cosmological parameters from the lensed CMB [135].…”

Section: Mitigation Of Parameter Biasmentioning

confidence: 99%

“…Note that Refs. [133][134][135] used the matter power spectra directly from simulations and therefore may differ somewhat from the parametric fits of HMcode that we employ here.…”

Section: Mitigation Of Parameter Biasmentioning

confidence: 99%

The Benefits of CMB Delensing

Hotinli,

Meyers,

Trendafilova

et al. 2021

Preprint

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The effects of gravitational lensing of the cosmic microwave background (CMB) have been measured at high significance with existing data and will be measured even more precisely in future surveys. Reversing the effects of lensing on the observed CMB temperature and polarization maps provides a variety of benefits. Delensed CMB spectra have sharper acoustic peaks and more prominent damping tails, allowing for improved inferences of cosmological parameters that impact those features. Delensing reduces B-mode power, aiding the search for primordial gravitational waves and allowing for lower variance reconstruction of lensing and other sources of secondary CMB anisotropies. Lensing-induced power spectrum covariances are reduced by delensing, simplifying analyses and improving constraints on primordial non-Gaussianities. Biases that result from incorrectly modeling nonlinear and baryonic feedback effects on the lensing power spectrum are mitigated by delensing. All of these benefits are possible without any changes to experimental or survey design. We develop a self-consistent, iterative, all-orders treatment of CMB delensing on the curved sky and demonstrate the impact that delensing will have with future surveys.

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Baryonic effects on CMB lensing and neutrino mass constraints

Cited by 23 publications

References 113 publications

Cosmological Implications of a Neutrino Mass Detection

Cosmological Implications of a Neutrino Mass Detection

Cosmology at high redshift -- a probe of fundamental physics

The Benefits of CMB Delensing

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