Retrieving cosmological information from small-scale CMB foregrounds

Recent results of ground-based telescopes, giving high-quality measurements the cosmic microwave background (CMB) temperature power spectrum on small scales (below 1 deg) motivate need for an accurate model foregrounds, which dominate primary signal at these multipoles. In a previous work, we have shown that cosmological information could be retrieved from thermal Sunyaev Zel’dovich (SZ) effect. this introduce physically motivated Epoch Reionisation in analysis CMB data, is coherent all scales. particular, high multipoles, kinetic SZ (kSZ) effect inferred set and reionisation parameters by machine-learning algorithm. First including asymmetric parameterisation history Planck 2018 data analysis, retrieve value Thomson optical depth consistent with results, but stemming completely different first luminous sources light up as early z = 15. Considering latest small-scale South Pole telescope (SPT) letting cosmology free to vary, find new cosmology-dependent tSZ kSZ spectra helps tighten constraints their amplitudes breaking degeneracy. We report 5 ? measurement ? 3000, D 3000 3.4 ?0.3 +0.5 ?K 2 68% confidence level (C.L.), marginalised over cosmology, well upper limit patchy pkSZ < 1.6 (95% C.L.). Additionally, SPT favour slightly earlier scenarios than , leading ? 0.062 ?0.015 +0.012 midpoint re 7.9 ?1.3 +1.1 (68% C.L.), line high-redshift quasars galaxies.