Zobrazeno 1 - 10
of 140
pro vyhledávání: '"Ralf Hofmann"'
Autor:
Ralf Hofmann, Janning Meinert
Publikováno v:
Astronomy, Vol 2, Iss 4, Pp 286-299 (2023)
We point out that a modified temperature–redshift relation (T-z relation) of the cosmic microwave background (CMB) cannot be deduced by any observational method that appeals to an a priori thermalisation to the CMB temperature T of the excited stat
Externí odkaz:
https://doaj.org/article/7bc2ed43dde94524ac3c2815111f65d4
Autor:
Ralf Hofmann
Publikováno v:
Universe, Vol 10, Iss 1, p 14 (2023)
This Special Issue on quantum field theory presents work covering a wide and topical range of subjects mainly within the area of interacting 4D quantum field theories subject to certain backgrounds [...]
Externí odkaz:
https://doaj.org/article/a73e746094114d008246e97234eecce8
Autor:
Ralf Hofmann, Thierry Grandou
Publikováno v:
Universe, Vol 8, Iss 2, p 117 (2022)
For a pure SU(2) Yang–Mills theory in 4D, we revisit the spatial (3D), ball-like region of radius r0 in its bulk subject to the pressureless, deconfining phase at T0=1.32Tc, where Tc denotes the critical temperature for the onset of the deconfining
Externí odkaz:
https://doaj.org/article/a3110a1e39304a5493b10799dbf57afb
Autor:
Janning Meinert, Ralf Hofmann
Publikováno v:
Universe, Vol 7, Iss 6, p 198 (2021)
Motivated by the SU(2)CMB modification of the cosmological model ΛCDM, we consider isolated fuzzy-dark-matter lumps, made of ultralight axion particles whose masses arise due to distinct SU(2) Yang–Mills scales and the Planck mass MP. In contrast
Externí odkaz:
https://doaj.org/article/1c4287f8e0cf444999816720f55e1b86
Autor:
Ralf Hofmann
Publikováno v:
Universe, Vol 6, Iss 9, p 135 (2020)
We review consequences for the radiation and dark sectors of the cosmological model arising from the postulate that the Cosmic Microwave Background (CMB) is governed by an SU(2) rather than a U(1) gauge principle. We also speculate on the possibility
Externí odkaz:
https://doaj.org/article/4bad27ce967842b1bd800d1a8a73ba5e
Publikováno v:
Advances in High Energy Physics, Vol 2018 (2018)
Externí odkaz:
https://doaj.org/article/2708896ad3a94ac2abd1542545a94bc7
Autor:
Steffen Hahn, Ralf Hofmann
Publikováno v:
Advances in High Energy Physics, Vol 2017 (2017)
Presently, we are facing a 3σ tension in the most basic cosmological parameter, the Hubble constant H0. This tension arises when fitting the Lambda-cold-dark-matter model (ΛCDM) to the high-precision temperature-temperature (TT) power spectrum of t
Externí odkaz:
https://doaj.org/article/4681473d70b14294b09aa99080814cb3
Publikováno v:
Universe, Vol 5, Iss 3, p 81 (2019)
Revisiting the fast fermion damping rate calculation in a thermalized QED and/or QCD plasma in thermal equilibrium at four-loop order, focus is put on a peculiar perturbative structure which has no equivalent at zero-temperature. Not surprisingly, an
Externí odkaz:
https://doaj.org/article/a62b7416032a4ec6a938c7645455550c
Publikováno v:
Universe, Vol 5, Iss 1, p 26 (2019)
Revisiting the fast fermion damping rate calculation in a thermalized momentum scale eT (QED) and/or momentum scale gT (QCD) plasma at 4-loop order, focus is put on a peculiar perturbative structure which has no equivalent at zero-temperature. Not su
Externí odkaz:
https://doaj.org/article/b45ab064aa2e4842ac98039e18ddbabf
Autor:
Ralf Hofmann
Publikováno v:
Universe, Vol 4, Iss 12, p 132 (2018)
In the first part of this talk, we review some prerequisites for and essential arguments involved in the construction of the thermal-ground-state estimate underlying the deconfining phase in the thermodynamics of SU(2) Quantum Yang⁻Mills theory and
Externí odkaz:
https://doaj.org/article/f849bff3eecc44a6aebb9741ddd5569a