124 citations · 607 across the 17 of their papers we have counts for
18 papers
Consistent treatment of flavour-specific neutrino self-interactions in cosmology
Gabriela Barenboim, Marco Drewes, Isabel M. Oldengott
We study the impact of flavour-specific neutrino self-interactions on the CMB anisotropy spectrum and consistently take into account neutrino mixing. Starting from the neutrino qua…
Baryogenesis and first-order QCD transition with gravitational waves from a large lepton asymmetry
Fei Gao, Julia Harz, Chandan Hati +3
A large primordial lepton asymmetry can lead to successful baryogenesis by preventing the restoration of electroweak symmetry at high temperatures, thereby suppressing the sphalero…
Local clustering of relic neutrinos: Comparison of kinetic field theory and the Vlasov equation
Emil Brinch Holm, Stefan Zentarra, Isabel M. Oldengott
Gravitational clustering in our cosmic vicinity is expected to lead to an enhancement of the local density of relic neutrinos. We derive expressions for the neutrino density, using…
Sphaleron freeze-in baryogenesis with gravitational waves from the QCD transition
Fei Gao, Julia Harz, Chandan Hati +3
A large primordial lepton asymmetry is capable of explaining the baryon asymmetry of the Universe (BAU) through suppression of the electroweak sphaleron rates (``sphaleron freeze-i…
Local clustering of relic neutrinos with kinetic field theory
Emil Brinch Holm, Isabel M. Oldengott, Stefan Zentarra
The density of relic neutrinos is expected to be enhanced due to clustering in our local neighbourhood at Earth. We introduce a novel analytical technique to calculate the neutrino…
LiteBIRD and CMB-S4 Sensitivities to Reheating in Plateau Models of Inflation
Marco Drewes, Lei Ming, Isabel Oldengott
We study the sensitivity of LiteBIRD and CMB-S4 to the reheating temperature and the inflaton coupling in three types of plateau-potential models of inflation, namely mutated hillt…
Weaker yet again: mass spectrum-consistent cosmological constraints on the neutrino lifetime
Joe Zhiyu Chen, Isabel M. Oldengott, Giovanni Pierobon +1
We consider invisible neutrino decay in the ultra-relativistic limit and compute the neutrino anisotropy loss rate relevant for the cosmic microwave background (C…
Cosmology meets functional QCD: First-order cosmic QCD transition induced by large lepton asymmetries
Fei Gao, Isabel M. Oldengott
The lepton flavour asymmetries of the Universe are observationally almost unconstrained before the onset of neutrino oscillations. We calculate the cosmic trajectory during the cos…
Lepton Flavour Asymmetries and the Mass Spectrum of Primordial Black Holes
Dietrich Bodeker, Florian Kuhnel, Isabel M. Oldengott +1
We study the influence of lepton flavour asymmetries on the formation and the mass spectrum of primordial black holes. We estimate the detectability of their mergers with LIGO/Virg…
Invisible neutrino decay in precision cosmology
Gabriela Barenboim, Joe Zhiyu Chen, Steen Hannestad +3
We revisit the topic of invisible neutrino decay in the precision cosmological context, via a first-principles approach to understanding the cosmic microwave background and large-s…
The cosmic QCD transition for large lepton flavour asymmetries
Mandy M. Middeldorf-Wygas, Isabel M. Oldengott, Dietrich Bödeker +1
We study the impact of large lepton flavour asymmetries on the cosmic QCD transition. Scenarios of unequal lepton flavour asymmetries are observationally almost unconstrained and t…
Inflation meets neutrinos
Gabriela Barenboim, Peter B. Denton, Isabel M. Oldengott
Constraints on inflationary models typically assume only the standard models of cosmology and particle physics. By extending the neutrino sector to include a new interaction with a…
How to relax the cosmological neutrino mass bound
Isabel M. Oldengott, Gabriela Barenboim, Sarah Kahlen +2
We study the impact of non-standard momentum distributions of cosmic neutrinos on the anisotropy spectrum of the cosmic microwave background and the matter power spectrum of the la…
Cosmic QCD Epoch at Nonvanishing Lepton Asymmetry
Mandy M. Wygas, Isabel M. Oldengott, Dietrich Bodeker +1
We investigate how a lepton asymmetry impacts the cosmic trajectory in the QCD phase diagram. We study the evolution of chemical potentials during the QCD epoch of the early Univer…
Interacting neutrinos in cosmology: exact description and constraints
Isabel M. Oldengott, Thomas Tram, Cornelius Rampf +1
We consider the impact of neutrino self-interactions described by an effective four-fermion coupling on cosmological observations. Implementing the exact Boltzmann hierarchy for in…
Improved constraints on lepton asymmetry from the cosmic microwave background
Isabel M. Oldengott, Dominik J. Schwarz
A cosmic lepton asymmetry affects the primordial helium abundance and the expansion rate of the early Universe. Both of these e…
Reionization and dark matter decay
Isabel M. Oldengott, Daniel Boriero, Dominik J. Schwarz
Cosmic reionization and dark matter decay can impact observations of the cosmic microwave sky in a similar way. A simultaneous study of both effects is required to constrain unstab…
Boltzmann hierarchy for interacting neutrinos I: formalism
Isabel M. Oldengott, Cornelius Rampf, Yvonne Y. Y. Wong
Starting from the collisional Boltzmann equation, we derive for the first time and from first principles the Boltzmann hierarchy for neutrinos including interactions with a scalar…