# Cosmic Microwave Background as a Thermal Gas of SU(2) Photons : Implications for the High$-z$ Cosmological Model and the Value of H₀

Hahn, Steffen; Hofmann, Ralf

Abstract:
Presently, we are facing a tension in the most basic cosmological parameter, the Hubble constant . This tension arises when fitting the Lambda-cold-dark-matter model (CDM) to the high-precision temperature-temperature (TT) power spectrum of the Cosmic Microwave Background (CMB) and to local cosmological observations. We propose a resolution of this problem by postulating that the thermal photon gas of the CMB obeys an SU() rather than U() gauge principle, suggesting a high- cosmological model which is void of dark-matter. Observationally, we rely on precise low-frequency intensity measurements in the CMB spectrum and on a recent model independent (low-) extraction of the relation between the comoving sound horizon at the end of the baryon drag epoch and (). We point out that the commonly employed condition for baryon-velocity freeze-out is imprecise, judged by a careful inspection of the formal solution to the associated Euler equation. As a consequence, the above-mentioned tension actually transforms into a discrepancy. To make contact with successful low-  CDM cosmology we propose an interpolation based on percolated/depercol ... mehr

 Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP) Publikationstyp Zeitschriftenaufsatz Jahr 2017 Sprache Englisch Identifikator ISSN: 1687-7357, 1687-7365 URN: urn:nbn:de:swb:90-768320 KITopen ID: 1000076832 HGF-Programm 51.03.06; LK 01 Erschienen in Advances in high energy physics Band 2017 Seiten 1–9 Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
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