Future Prospects on Constraining Neutrino Cosmology with the Ali CMB Polarization Telescope

Zhang, Dongdong; Li, Jiarui; Yang, Jiaqi; Zhang, Yufei; Cai, Yi-Fu; Fang, Wenjuan; Feng, Chang

doi:10.3847/1538-4357/acbe45

Cited by 3 publications

(1 citation statement)

References 52 publications

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“…The AliCPT-1 telescope can be used for scientific targets other than primordial gravitational waves, including galactic and extra-galactic science [25]. Among these secondary science cases, CMB lensing is one of the promising topics.…”

Section: Introductionmentioning

confidence: 99%

Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data

Han

Ghosh

et al. 2023

J. Cosmol. Astropart. Phys.

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The gravitational lensing distortion of Cosmic microwave background radiation (CMB) carries fruitful information of cosmic large-scale structure. However, CMB observations are unavoidably contaminated by emission from various extra-galactic foregrounds, which must be removed to obtain reliable measurements of the cosmological signal. In this paper, we demonstrate CMB lensing reconstruction in AliCPT-1 after foreground removal, combine the two bands of AliCPT-1 (90 and 150 GHz) with Planck HFI bands (100, 143, 217 and 353 GHz) and with the WMAP-K band (23 GHz). In order to balance contamination by instrumental noise and foreground residual bias, we adopt the Needlet Internal Linear Combination (NILC) method to clean the E-map and the constrained Internal Linear Combination (cILC) method to clean the B-map. The latter utilizes additional constraints on average frequency scaling of the dust and synchrotron to remove foregrounds at the expense of somewhat noisier maps. Assuming 4 modules observing 1 season from simulation data, the resulting effective residual noise in E- and B-map are roughly 15 μ K· arcmin and 25 μ K· arcmin, respectively. As a result, the CMB lensing reconstruction signal-to-noise ratio (SNR) from polarization data is about SNR≈4.5. This lensing reconstruction capability is comparable to that of other stage-III small aperture millimeter CMB telescopes.

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Section: Introductionmentioning

confidence: 99%

Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data

Han

Ghosh

et al. 2023

J. Cosmol. Astropart. Phys.

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Testing the coupling of dark radiations in light of the Hubble tension

Lu,

Imtiaz,

Zhang

et al. 2024

Eur. Phys. J. C

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We are studying the effects of Self-Interacting dark radiation (SIdr) on the evolution of the universe. Our main focus is on the cosmic microwave background (CMB) and how SIdr could potentially help resolve the Hubble tension. We are looking into different scenarios by mixing SIdr with Free-Streaming dark radiation (FSdr) or not to determine whether SIdr can indeed contribute to solving the Hubble tension. We find that SIdr alone can increase the Hubble constant ($$H_0$$ H 0 ) to $$70.1_{-1.6}^{+1.3}, \text {km/s/Mpc}$$ 70 . 1 - 1.6 + 1.3 , km/s/Mpc with a value of $$N_\textrm{eff}=3.27_{-0.31}^{+0.23}$$ N eff = 3 . 27 - 0.31 + 0.23 . However, including FSdr disfavors the existence of SIdr $${\tilde{N}}_\textrm{si}\approx 0.37$$ N ~ si ≈ 0.37 . Even though the Hubble constant is increased compared to the predicted value, it entails $$N_\textrm{eff}=3.52\pm 0.25$$ N eff = 3.52 ± 0.25 . Finally, we implement the Fisher method for future experiments and a $$7.64\sigma $$ 7.64 σ measurement of $${\tilde{N}}_\textrm{si}$$ N ~ si will be obtained when combing data from Planck, AliCPT, and CMB-S4.

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A GPU-Accelerated Modern Fortran Version of the ECHO Code for Relativistic Magnetohydrodynamics

Del Zanna,

Landi,

Serafini

et al. 2024

Fluids

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The numerical study of relativistic magnetohydrodynamics (MHD) plays a crucial role in high-energy astrophysics but unfortunately is computationally demanding, given the complex physics involved (high Lorentz factor flows, extreme magnetization, and curved spacetimes near compact objects) and the large variety of spatial scales needed to resolve turbulent motions. A great benefit comes from the porting of existing codes running on standard processors to GPU-based platforms. However, this usually requires a drastic rewriting of the original code, the use of specific languages like CUDA, and a complex analysis of data management and optimization of parallel processes. Here, we describe the porting of the ECHO code for special and general relativistic MHD to accelerated devices, simply based on native Fortran language built-in constructs, especially do concurrent loops, few OpenACC directives, and straightforward data management provided by the Unified Memory option of NVIDIA compilers. Thanks to these very minor modifications to the original code, the new version of ECHO runs at least 16 times faster on GPU platforms as compared to CPU-based ones. The chosen benchmark is the 3D propagation of a relativistic MHD Alfvén wave, for which strong and weak scaling tests performed on the LEONARDO pre-exascale supercomputer at CINECA are provided (using up to 256 nodes corresponding to 1024 GPUs, and over 14 billion cells). Finally, an example of high-resolution relativistic MHD Alfvénic turbulence simulation is shown, demonstrating the potential for astrophysical plasmas of the new GPU-based version of ECHO.

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Future Prospects on Constraining Neutrino Cosmology with the Ali CMB Polarization Telescope

Cited by 3 publications

References 52 publications

Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data

Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data

Testing the coupling of dark radiations in light of the Hubble tension

A GPU-Accelerated Modern Fortran Version of the ECHO Code for Relativistic Magnetohydrodynamics

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