181 citations · 922 across the 18 of their papers we have counts for
21 papers
Improved Big Bang Nucleosynthesis constraints on decaying massive relics
Sara Bianco, Jonas Frerick, Marco Hufnagel +1
We present updated and improved Big Bang Nucleosynthesis (BBN) constraints on heavy, long-lived beyond the Standard Model (BSM) relics decaying into pairs of Standard Model par…
Non-Cold Dark Matter from Memory-Burdened Primordial Black Holes
Valentin Thoss, Laura Lopez-Honorez, Florian Kühnel +1
Non-cold dark matter particles can arise from the evaporation of primordial black holes (PBHs). In this paper, we further investigate how the memory-burden effect, which delays the…
Photo- and Hadrodisintegration constraints on massive relics decaying into neutrinos
Sara Bianco, Paul Frederik Depta, Jonas Frerick +3
We perform a detailed study of the cosmological constraints on the decay of a relic particle into neutrinos, , in particular those arising from the observe…
Big Bang Nucleosynthesis constraints on resonant DM annihilations
Pieter Braat, Marco Hufnagel
We perform a systematic study of BBN constraints from photodisintegration for scenarios in which dark-matter annihilations are resonantly-enhanced. To this end, we implement and ma…
The domain of a cannibal dark matter
Marco Hufnagel, Michel H. G. Tytgat
We consider a scenario in which the dark matter is alone in a hidden sector and consists of a real scalar particle with a manifest or spontaneously broken symmetry,…
A new life for sterile neutrino dark matter after the pandemic
Torsten Bringmann, Paul Frederik Depta, Marco Hufnagel +3
We propose a novel mechanism to generate sterile neutrinos in the early Universe, by converting ordinary neutrinos in scattering processes . After init…
The Present and Future Status of Heavy Neutral Leptons
Asli M. Abdullahi, Pablo Barham Alzas, Brian Batell +42
The existence of non-zero neutrino masses points to the likely existence of multiple SM neutral fermions. When such states are heavy enough that they cannot be produced in oscillat…
Cosmological constraints on the decay of heavy relics into neutrinos
Thomas Hambye, Marco Hufnagel, Matteo Lucca
A massive particle decaying into neutrinos in the early Universe is known to be less constrained than if it was decaying into other standard model particles. However, even if the d…
Dark matter produced from neutrinos
Marco Hufnagel, Xun-Jie Xu
In the presence of interactions between neutrinos and dark matter (DM), DM can potentially be produced via freeze-in from the neutrino sector. We investigate the implications of su…
Dark Matter from Exponential Growth
Torsten Bringmann, Paul Frederik Depta, Marco Hufnagel +2
We propose a novel mechanism for the production of dark matter (DM) from a thermal bath, based on the idea that DM particles can transform heat bath particles : $χψ\rightarr…
ACROPOLIS: A generiC fRamework fOr Photodisintegration Of LIght elementS
Paul Frederik Depta, Marco Hufnagel, Kai Schmidt-Hoberg
The remarkable agreement between observations of the primordial light element abundances and the corresponding theoretical predictions within the standard cosmological history prov…
Updated BBN constraints on electromagnetic decays of MeV-scale particles
Paul Frederik Depta, Marco Hufnagel, Kai Schmidt-Hoberg
In this work, we revise and update model-independent constraints from Big Bang Nucleosynthesis on MeV-scale particles which decay into photons and/or electron-positron pairs. W…
MeV-scale Seesaw and Leptogenesis
Valerie Domcke, Marco Drewes, Marco Hufnagel +1
We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly const…
Precise dark matter relic abundance in decoupled sectors
Torsten Bringmann, Paul Frederik Depta, Marco Hufnagel +1
Dark matter (DM) as a thermal relic of the primordial plasma is increasingly pressured by direct and indirect searches, while the same production mechanism in a decoupled sector is…
Robust cosmological constraints on axion-like particles
Paul Frederik Depta, Marco Hufnagel, Kai Schmidt-Hoberg
Axion-like particles with masses in the keV-GeV range have a profound impact on the cosmological evolution of our Universe, in particular on the abundance of light elements produce…
Direct detection and complementary constraints for sub-GeV dark matter
Kyrylo Bondarenko, Alexey Boyarsky, Torsten Bringmann +3
Traditional direct searches for dark matter, looking for nuclear recoils in deep underground detectors, are challenged by an almost complete loss of sensitivity for light dark matt…
Conversion-driven freeze-out: Dark matter genesis beyond the WIMP paradigm
Mathias Garny, Jan Heisig, Marco Hufnagel +2
We consider dark matter (DM) with very weak couplings to the standard model (SM), such that its self-annihilation cross section is much smaller than the canonical one, $\langleσv\r…
BBN constraints on the annihilation of MeV-scale dark matter
Paul Frederik Depta, Marco Hufnagel, Kai Schmidt-Hoberg +1
Thermal dark matter at the MeV scale faces stringent bounds from a variety of cosmological probes. Here we perform a detailed evaluation of BBN bounds on the annihilation cross sec…
BBN constraints on MeV-scale dark sectors. Part II. Electromagnetic decays
Marco Hufnagel, Kai Schmidt-Hoberg, Sebastian Wild
Meta-stable dark sector particles decaying into electrons or photons may non-trivially change the Hubble rate, lead to entropy injection into the thermal bath of Standard Model par…
Top-philic dark matter within and beyond the WIMP paradigm
Mathias Garny, Jan Heisig, Marco Hufnagel +1
We present a comprehensive analysis of top-philic Majorana dark matter that interacts via a colored t-channel mediator. Despite the simplicity of the model -- introducing three par…
BBN constraints on MeV-scale dark sectors. Part I. Sterile decays
Marco Hufnagel, Kai Schmidt-Hoberg, Sebastian Wild
We study constraints from Big Bang Nucleosynthesis on inert particles in a dark sector which contribute to the Hubble rate and therefore change the predictions of the primordial nu…