Simone Biondini
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View article: Connecting t-channel dark matter models to the Standard Model Effective Field Theory
Connecting t-channel dark matter models to the Standard Model Effective Field Theory Open
A bstract We investigate the connection between simplified dark matter models featuring a t -channel scalar mediator and the Standard Model Effective Field Theory (SMEFT). We focus on scenarios with fermionic dark matter interacting with l…
View article: Connecting $t$-channel Dark Matter Models to the Standard Model Effective Field Theory
Connecting $t$-channel Dark Matter Models to the Standard Model Effective Field Theory Open
We investigate the connection between simplified dark matter models featuring a $t$-channel scalar mediator and the Standard Model Effective Field Theory (SMEFT). We focus on scenarios with fermionic dark matter interacting with leptons, u…
View article: Effective field theories for dark matter pairs in the early universe: Debye mass effects
Effective field theories for dark matter pairs in the early universe: Debye mass effects Open
A bstract In some scenarios for the early universe, non-relativistic thermal dark matter chemically decouples from the thermal environment once the temperature drops well below the dark matter mass. The value at which the energy density fr…
View article: Effective field theories for dark matter pairs in the early universe: Debye mass effects
Effective field theories for dark matter pairs in the early universe: Debye mass effects Open
In some scenarios for the early universe, non-relativistic thermal dark matter chemically decouples from the thermal environment once the temperature drops well below the dark matter mass. The value at which the energy density freezes out …
View article: Smooth reheating and dark matter via non-Abelian gauge theory
Smooth reheating and dark matter via non-Abelian gauge theory Open
We demonstrate how a dark sector can provide a crucial link between a vacuum-dominated early universe and the later radiation-dominated epoch. As an example, we consider a feeble axion-like coupling of dark non-Abelian gauge fields with a …
View article: Effective field theories for dark matter pairs in the early universe: center-of-mass recoil effects
Effective field theories for dark matter pairs in the early universe: center-of-mass recoil effects Open
A bstract For non-relativistic thermal dark matter, close-to-threshold effects largely dominate the evolution of the number density for most of the times after thermal freeze-out, and hence affect the cosmological relic density. A precise …
View article: Smooth reheating and dark matter via non-Abelian gauge theory
Smooth reheating and dark matter via non-Abelian gauge theory Open
We demonstrate how a dark sector can provide a crucial link between a vacuum-dominated early universe and the later radiation-dominated epoch. As an example, we consider a feeble axion-like coupling of dark non-Abelian gauge fields with a …
View article: Indirect detection of dark matter with (pseudo)-scalar interactions
Indirect detection of dark matter with (pseudo)-scalar interactions Open
A bstract Indirect detection is one of the most powerful methods to search for annihilating dark matter. In this work, we investigate the impact of non-perturbative effects in the indirect detection of dark matter. For this purpose we util…
View article: Effective field theories for dark matter pairs in the early universe: center-of-mass recoil effects
Effective field theories for dark matter pairs in the early universe: center-of-mass recoil effects Open
For non-relativistic thermal dark matter, close-to-threshold effects largely dominate the evolution of the number density for most of the times after thermal freeze-out, and hence affect the cosmological relic density. A precise evaluation…
View article: Center-of-mass recoil effects on the annihilation and formation of dark matter bound pairs
Center-of-mass recoil effects on the annihilation and formation of dark matter bound pairs Open
For a quantitative investigation on the time evolution of heavy thermal dark matter at and after thermal freeze-out, near-threshold processes need to be taken into account which have a large impact on the observed dark matter relic abundan…
View article: Center-of-mass recoil effects on the annihilation and formation of dark matter bound pairs
Center-of-mass recoil effects on the annihilation and formation of dark matter bound pairs Open
For a quantitative investigation on the time evolution of heavy thermal dark matter at and after thermal freeze-out, near-threshold processes need to be taken into account which have a large impact on the observed dark matter relic abundan…
View article: Interplay between improved interaction rates and modified cosmological histories for dark matter
Interplay between improved interaction rates and modified cosmological histories for dark matter Open
A novel particle has been and still is an intriguing option to explain the strong evidence for dark matter in our universe. To quantitatively predict the dark matter energy density, two main ingredients are needed: interaction rates and th…
View article: Interplay between improved interaction rates and modified cosmological histories for dark matter
Interplay between improved interaction rates and modified cosmological histories for dark matter Open
A novel particle has been and still is an intriguing option to explain the strong evidence for dark matter in our universe. To quantitatively predict the dark matter energy density, two main ingredients are needed: interaction rates and an…
View article: Indirect detection of dark matter with (pseudo)-scalar interactions
Indirect detection of dark matter with (pseudo)-scalar interactions Open
Indirect detection is one of the most powerful methods to search for annihilating dark matter. In this work, we investigate the impact of non-perturbative effects in the indirect detection of dark matter. For this purpose we utilize a mini…
View article: Non-perturbative effects for dark sectors with QCD portals
Non-perturbative effects for dark sectors with QCD portals Open
A bstract In this work, we consider a class of dark matter (DM) models where the DM does not directly interact with the Standard Model (SM) particles at the tree-level. Therefore, the coannihilation mechanism is crucial in achieving the co…
View article: Non-perturbative effects for dark sectors with QCD portals
Non-perturbative effects for dark sectors with QCD portals Open
In this work, we consider a class of dark matter (DM) models where the DM does not directly interact with the Standard Model (SM) particles at the tree-level. Therefore, the coannihilation mechanism is crucial in achieving the correct DM r…
View article: Effective field theories for dark matter pairs in the early universe: cross sections and widths
Effective field theories for dark matter pairs in the early universe: cross sections and widths Open
In order to predict the cosmological abundance of dark matter, an estimation of particle rates in an expanding thermal environment is needed. For thermal dark matter, the non-relativistic regime sets the stage for the freeze-out of the dar…
View article: Effective Field Theories for Dark Matter Pairs in the Early Universe
Effective Field Theories for Dark Matter Pairs in the Early Universe Open
In this conference paper, we consider effective field theories of\nnon-relativistic dark matter particles interacting with a light force mediator\nin the early expanding universe. We present a general framework, where to\naccount in a syst…
View article: Strong electroweak phase transition in $t$-channel simplified dark matter models
Strong electroweak phase transition in $t$-channel simplified dark matter models Open
Beyond the Standard Model physics is required to explain both dark matter and the baryon asymmetry of the universe, the latter possibly generated during a strong first-order electroweak phase transition. While many proposed models tackle t…
View article: Bound-state formation, dissociation and decays of darkonium with potential non-relativistic Yukawa theory for scalar and pseudoscalar mediators
Bound-state formation, dissociation and decays of darkonium with potential non-relativistic Yukawa theory for scalar and pseudoscalar mediators Open
A bstract Dark matter models with light mediators featuring sizable interactions among dark particles enjoy an increasing attention in the model building community due to the elegance with which they can potentially explain the scaling rel…
View article: Bound-state formation, dissociation and decays of darkonium with potential non-relativistic Yukawa theory for scalar and pseudoscalar mediators
Bound-state formation, dissociation and decays of darkonium with potential non-relativistic Yukawa theory for scalar and pseudoscalar mediators Open
Dark matter models with light mediators featuring sizable interactions among dark particles enjoy an increasing attention in the model building community due to the elegance with which they can potentially explain the scaling relations gov…
View article: Complementarity between neutrinoless double beta decay and collider searches for heavy neutrinos in composite-fermion models
Complementarity between neutrinoless double beta decay and collider searches for heavy neutrinos in composite-fermion models Open
Composite-fermion models predict excited quarks and leptons with mass scales which can potentially be observed at high-energy colliders like the LHC; the most recent exclusion limits from the CMS and ATLAS Collaborations corner excited-fer…
View article: Hierarchy problem and fine-tuning in a decoupling approach to multiscale effective potentials
Hierarchy problem and fine-tuning in a decoupling approach to multiscale effective potentials Open
In many realizations of beyond the Standard Model theories, new massive\nparticles are introduced, leading to a multi-scale system with widely separated\nenergy scales. In this setting the Coleman-Weinberg effective potential, which\ndescr…
View article: Revisiting freeze-in dark matter from renormalizable operators
Revisiting freeze-in dark matter from renormalizable operators Open
In this conference paper we summarise the findings of a recent study, where the impact of the ultra-relativistic regime on the production of a feebly interacting dark matter particle is considered. As its population accumulates over the th…
View article: Freeze-in produced dark matter in the ultra-relativistic regime
Freeze-in produced dark matter in the ultra-relativistic regime Open
When dark matter particles only feebly interact with plasma constituents in the early universe, they never reach thermal equilibrium. As opposed to the freeze-out mechanism, where the dark matter abundance is determined at T ≪ M, the energ…
View article: Revisiting Freeze-in Dark Matter from Renormalizble Operators
Revisiting Freeze-in Dark Matter from Renormalizble Operators Open
In this conference paper we summarize the findings of a recent study [1], where the impact of the ultrarelativistic regime on the production of a feebly interacting dark matter particle is considered.As its population accumulates over the …
View article: Perturbative unitarity bounds for fermions composite models
Perturbative unitarity bounds for fermions composite models Open
Perturbative unitarity is a powerful tool for inferring the range of validity of a given effective field theory. Here, we study such a bound in the parameter space of dimension-5 and dimension-6 effective operators that arise in a scenario…