Publications (31)
Bound-state formation, dissociation and decays of darkonium with potential non-relativistic Yukawa theory for scalar and pseudoscalar mediators
Simone Biondini, Vladyslav Shtabovenko
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 w…
Indirect detection of dark matter with (pseudo)-scalar interactions
Simone Biondini, Julian Bollig, Stefan Vogl
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 d…
Center-of-mass recoil effects on the annihilation and formation of dark matter bound pairs
Simone Biondini, Nora Brambilla, Gramos Qerimi +1
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 ha…
Effective Field Theories for Dark Matter Pairs in the Early Universe
Simone Biondini, Nora Brambilla, Gramos Qerimi +1
In this conference paper, we consider effective field theories of non-relativistic dark matter particles interacting with a light force mediator in the early expanding universe. We…
Connecting -channel Dark Matter Models to the Standard Model Effective Field Theory
Simone Biondini, Lorenzo Tiberi, Orlando Panella
We investigate the connection between simplified dark matter models featuring a -channel scalar mediator and the Standard Model Effective Field Theory (SMEFT). We focus on scena…
Non-perturbative effects for dark sectors with QCD portals
Simone Biondini, Talal Ahmed Chowdhury, Shaikh Saad
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 coanni…
CP asymmetry in heavy Majorana neutrino decays at finite temperature: the hierarchical case
Simone Biondini, Nora Brambilla, Antonio Vairo
We consider the simplest realization of leptogenesis with one heavy Majorana neutrino species much lighter than the other ones. In this scenario, when the temperature of the early…
An effective field theory for non-relativistic Majorana neutrinos
Simone Biondini, Nora Brambilla, Miguel Angel Escobedo +1
Heavy Majorana neutrinos enter in many scenarios of physics beyond the Standard Model: in the original seesaw mechanism they provide a natural explanation for the small masses of t…
Effective field theories for heavy Majorana neutrinos in a thermal bath
Simone Biondini
Heavy Majorana neutrinos enter in many scenarios of physics beyond the Standard Model and play a special role in the leptogenesis framework as origin of the baryon asymmetry in the…
Effective field theories: from Cosmology to Quark Gluon Plasma
Simone Biondini
Cosmology and particle physics come across a tight connection in the attempt to reproduce and understand quantitatively the results of experimental findings. Indeed, the quark gluo…
Effective field theories for dark matter pairs in the early universe: center-of-mass recoil effects
Simone Biondini, Nora Brambilla, Gramos Qerimi +1
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…
Interplay between improved interaction rates and modified cosmological histories for dark matter
Simone Biondini
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…
Revisiting freeze-in dark matter from renormalizable operators
Simone Biondini
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 partic…
Dark matter and Standard Model reheating from conformal GUT inflation
Simone Biondini, K. Sravan Kumar
Spontaneous breaking of conformal symmetry has been widely exploited in successful model building of both inflationary cosmology and particle physics phenomenology. Conformal Grand…
Searching Doubly Charged Leptons at Present and Future Colliders
Simone Biondini, Orlando Panella, Giulia Pancheri +2
The production at the LHC of exotic excited leptons of charge is considered. Such states are predicted in composite models with extended isospin multiplets ( and…
Perturbative unitarity bounds for fermions composite models
Simone Biondini
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 a…
Leptogenesis and composite heavy neutrinos with gauge mediated interactions
Simone Biondini, Orlando Panella
Leptogenesis is an appealing framework to account for the baryon asymmetry in the universe. To this end physics beyond the Standard Model is demanded. In this paper we investigate…
Effective field theories for dark matter pairs in the early universe: cross sections and widths
Simone Biondini, Nora Brambilla, Gramos Qerimi +1
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-relat…
The hierarchy problem and fine-tuning in a decoupling approach to multi-scale effective potentials
Simone Biondini, Daniël Boer, Ruud Peeters
In many realizations of beyond the Standard Model theories, new massive particles are introduced, leading to a multi-scale system with widely separated energy scales. In this setti…
Status of rates and rate equations for thermal leptogenesis
Simone Biondini, Dietrich Bodeker, Nora Brambilla +8
In many realizations of leptogenesis, heavy right-handed neutrinos play the main role in the generation of an imbalance between matter and antimatter in the early Universe. Hence,…
Non-relativistic and potential non-relativistic effective field theories for scalar mediators
Simone Biondini, Vladyslav Shtabovenko
Yukawa-type interactions between heavy Dirac fermions and a scalar field are a common ingredient in various extensions of the Standard Model. Despite of that, the non-relativistic…
Effective field theories for dark matter pairs in the early universe: Debye mass effects
Simone Biondini, Nora Brambilla, Andrii Dashko +2
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 matt…
Strong electroweak phase transition in -channel simplified dark matter models
Simone Biondini, Philipp Schicho, Tuomas V. I. Tenkanen
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 electr…
CP asymmetry in heavy Majorana neutrino decays at finite temperature: the nearly degenerate case
Simone Biondini, Nora Brambilla, Miguel Angel Escobedo +1
In a model where Majorana neutrinos heavier than the electroweak scale couple to Standard Model Higgs bosons and leptons, we compute systematically thermal corrections to the direc…
A critical look at low-scale cosmological phase transitions in the PTA era
Simone Biondini, Philipp Schicho
Motivated by the recent evidence for a stochastic gravitational-wave (GW) background reported by pulsar timing array (PTA) collaborations, we perform a precision study of low-scale…
Momentum anisotropy effects for quarkonium in a weakly-coupled quark-gluon plasma below the melting temperature
Simone Biondini, Nora Brambilla, Miguel Angel Escobedo +1
In the early stages of heavy-ion collisions, the hot QCD matter expands more longitudinally than transversely. This imbalance causes the system to become rapidly colder in the long…
Freeze-in produced dark matter in the ultra-relativistic regime
Simone Biondini, Jacopo Ghiglieri
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…
Bound-state effects for dark matter with Higgs-like mediators
Simone Biondini
In this paper we study the impact of a scalar exchange on the dark matter relic abundance by solving a plasma-modified Schroedinger equation. A simplified model is considered where…
Smooth reheating and dark matter via non-Abelian gauge theory
Simone Biondini, Helena Kolesova, Simona Procacci
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 a…
Scalar dark matter coannihilating with a coloured fermion
Simone Biondini, Stefan Vogl
We analyse the phenomenology of a simplified model for a real scalar dark matter candidate interacting with quarks via a coloured fermionic mediator. In the coannihilation regime,…
Charting the Flavour Structure of Dark Matter
Simone Biondini, Admir Greljo, Xavier Ponce DÃaz +1
What flavour structure of -channel thermal dark matter remains compatible with current flavour physics and direct detection bounds? We broadly chart the space of hypotheses usin…