Ralf Hofmann
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View article: Steven Weinberg’s Life for Physics
Steven Weinberg’s Life for Physics Open
This is a personal review of Steven Weinberg’s scientific autobiography “A Life in Physics”. A reflection on both, personal aspects and scientific milestones of Professor Weinberg’s role-model life is conducted to honour his lasting accomp…
View article: On the Yang-Mills Propagator at Strong Coupling
On the Yang-Mills Propagator at Strong Coupling Open
About twelve years ago, the use of standard functional manipulations was demonstrated to imply an unexpected property satisfied by the fermionic Green’s functions of QCD. This non-perturbative phenomenon has been dubbed an effective locali…
View article: Axion Mass and the Ground State of Deconfining SU(2) Yang–Mills Thermodynamics
Axion Mass and the Ground State of Deconfining SU(2) Yang–Mills Thermodynamics Open
For the deconfinement phase of an SU(2) Yang–Mills theory, we compute the axion mass mA by appealing to the Veneziano–Witten formula. The topological susceptibility χ arises (i) from a precisely computable thermal ground-state contribution…
View article: On the Yang-Mills propagator at strong coupling
On the Yang-Mills propagator at strong coupling Open
About twelve years ago the use of standard functional manipulations was demonstrated to imply an unexpected property satisfied by the fermionic Green's functions of QCD. This non-perturbative phenomenon is dubbed Effective Locality. In a m…
View article: Electroweak Parameters from Mixed SU(2) Yang–Mills Thermodynamics
Electroweak Parameters from Mixed SU(2) Yang–Mills Thermodynamics Open
Based on the thermal phase structure of pure SU(2) quantum Yang–Mills theory, we describe the electron at rest as an extended particle, a droplet of radius r0∼a0, where a0 is the Bohr radius. This droplet is of vanishing pressure and traps…
View article: Electroweak parameters from mixed SU(2) Yang-Mills Thermodynamics
Electroweak parameters from mixed SU(2) Yang-Mills Thermodynamics Open
Based on the thermal phase structure of pure SU(2) quantum Yang-Mills theory, we describe the electron at rest as an extended particle, a droplet of radius $r_0\sim a_0$, where $a_0$ is the Bohr radius. This droplet is of vanishing pressur…
View article: Quantum Field Theory
Quantum Field Theory Open
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 [...]
View article: Frequency–Redshift Relation of the Cosmic Microwave Background
Frequency–Redshift Relation of the Cosmic Microwave Background Open
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 exc…
View article: Cosmological Parameters from Planck Data in SU(2)<sub>CMB</sub>, Their Local ΛCDM Values, and the Modified Photon Boltzmann Equation
Cosmological Parameters from Planck Data in SU(2)<sub>CMB</sub>, Their Local ΛCDM Values, and the Modified Photon Boltzmann Equation Open
A review of the spatially flat cosmological model SU(2) CMB , minimally induced by the postulate that the cosmic microwave background (CMB) is subject to an SU(2) rather than a U(1) gauge principle, is given. Cosmological parameter values,…
View article: Frequency-redshift relation of the Cosmic Microwave Background
Frequency-redshift relation of the Cosmic Microwave Background Open
We point out that a modified temperature-redshift relation ($T$-$z$ relation) of the cosmic microwave background (CMB) can not be deduced by any observational method that appeals to an a priori thermalisation to the CMB temperature $T$ of …
View article: Cosmological parameters from Planck data in SU(2)$_{\rm CMB}$, their local $Λ$CDM values, and the modified photon Boltzmann equation
Cosmological parameters from Planck data in SU(2)$_{\rm CMB}$, their local $Λ$CDM values, and the modified photon Boltzmann equation Open
A review of the spatially flat cosmological model SU(2)$_{\rm CMB}$, minimally induced by the postulate that the Cosmic Microwave Background (CMB) is subject to an SU(2) rather than a U(1) gauge principle, is given. Cosmological parameter …
View article: On Emergent Particles and Stable Neutral Plasma Balls in SU(2) Yang-Mills Thermodynamics
On Emergent Particles and Stable Neutral Plasma Balls in SU(2) Yang-Mills Thermodynamics Open
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 de…
View article: Axial Anomaly in Galaxies and the Dark Universe
Axial Anomaly in Galaxies and the Dark Universe Open
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 c…
View article: Capillarity and active cell movement at mesendoderm translocation in the <i>Xenopus</i> gastrula
Capillarity and active cell movement at mesendoderm translocation in the <i>Xenopus</i> gastrula Open
During Xenopus gastrulation, leading edge mesendoderm (LEM) advances animally as a wedge-shaped cell mass over the vegetally moving blastocoel roof (BCR). We show that close contact across the BCR-LEM interface correlates with attenuated n…
View article: An SU(2) Gauge Principle for the CMB: Perspectives on Dark Sector of the Cosmological Model
An SU(2) Gauge Principle for the CMB: Perspectives on Dark Sector of the Cosmological Model Open
We review consequences for the radiation and dark sectors of the cosmological model arising from the postulate that the CMB is governed by an SU(2) rather than a U(1) gauge principle. We also speculate on the possibility of actively assist…
View article: On emergent particles and stable neutral plasma balls in SU(2) Yang-Mills thermodynamics
On emergent particles and stable neutral plasma balls in SU(2) Yang-Mills thermodynamics Open
For a pure SU(2) Yang-Mills theory in 4D we revisit the spatial (3D), ball-like region of radius $r_0$, in its bulk subject to the pressureless, deconfining phase at $T_0=1.32\,T_c$ where $T_c$ denotes the critical temperature for the onse…
View article: On the absence of the Gribov copy problem in `effective locality' QCD calculations
On the absence of the Gribov copy problem in `effective locality' QCD calculations Open
About ten years ago the use of standard functional manipulations was demonstrated to imply an unexpected property satisfied by the fermionic Green's functions of QCD and dubbed effective locality. This feature of QCD is non-perturbative as…
View article: Perturbative Peculiarities of Quantum Field Theories at High Temperatures
Perturbative Peculiarities of Quantum Field Theories at High Temperatures Open
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 surpr…
View article: On Quantum Fields at High Temperature
On Quantum Fields at High Temperature Open
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-temperat…
View article: Chiral symmetry breaking out of QCD effective locality
Chiral symmetry breaking out of QCD effective locality Open
The QCD non-perturbative property of Effective Locality whose essential meaning has been disclosed recently, is here questioned about the chiral symmetry breaking phenomenon, one of the two major issues of the non-perturbative phase of QCD…
View article: SU(2) Quantum Yang–Mills Thermodynamics: Some Theory and Some Applications
SU(2) Quantum Yang–Mills Thermodynamics: Some Theory and Some Applications Open
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 t…
View article: SU(2)<scp>cmb</scp>and the cosmological model: angular power spectra
SU(2)<span>cmb</span>and the cosmological model: angular power spectra Open
Driven by the CMB temperature-redshift ($T$-$z$) relation as demanded by deconfining SU(2) Yang-Mills thermodynamics, an according cosmological model is proposed and analysed. This model -- SU(2)$_\CMB$ -- exhibits a dark sector, represent…
View article: SU(2) Quantum Yang-Mills Thermodynamics: Some Theory and Some Applications
SU(2) Quantum Yang-Mills Thermodynamics: Some Theory and Some Applications Open
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 for the deconfining phase in the thermodynamics of SU(2) Quantum Yang-Mills theory an…
View article: Finite- and infinite-volume thermodynamics around the zero of the\n pressure in deconfining SU(2) Quantum Yang-Mills theory
Finite- and infinite-volume thermodynamics around the zero of the\n pressure in deconfining SU(2) Quantum Yang-Mills theory Open
We re-address the self-intersection region in a figure-eight shaped\ncenter-vortex loop containing a frequently perturbed {\\sl BPS monopole} subject\nto a core-oscillation frequency $\\omega_0$, rectifying a numerical error in\nestimating…
View article: Finite- and infinite-volume thermodynamics around the zero of the pressure in deconfining SU(2) Quantum Yang-Mills theory
Finite- and infinite-volume thermodynamics around the zero of the pressure in deconfining SU(2) Quantum Yang-Mills theory Open
We re-address the self-intersection region in a figure-eight shaped center-vortex loop containing a frequently perturbed {\sl BPS monopole} subject to a core-oscillation frequency $ω_0$, rectifying a numerical error in estimating the syste…
View article: Exact determination of asymptotic CMB temperature-redshift relation
Exact determination of asymptotic CMB temperature-redshift relation Open
Based on energy conservation in a Friedmann–Lemaître–Robertson–Walker (FLRW) Universe, on the Legendre transformation between energy density and pressure, and on nonperturbative asymptotic freedom at high temperatures, we derive the coeffi…
View article: SU(2) Yang-Mills thermodynamics: A priori estimate and radiative corrections
SU(2) Yang-Mills thermodynamics: A priori estimate and radiative corrections Open
We review and explain essential characteristics of the a priori estimate of the thermal ground state and its excitations in the deconfining phase of SU(2) Quantum Yang-Mills thermodynamics. This includes the spatially central and periphera…
View article: On How QCD Gauge Invariance Gets Realized in the Context of Effective Locality
On How QCD Gauge Invariance Gets Realized in the Context of Effective Locality Open
The fermionic Green’s functions of QCD exhibit an unexpected property of effective locality , which appears to be exact, involving no approximation. This property is nonperturbative, resulting from a full integration of the elementary gluo…