A5073755876- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Distributed and Parallel Computing Systems
- Computational Physics and Python Applications
- Neutrino Physics Research
- High-Energy Particle Collisions Research
Imperial College London
2019-2022
The University of Queensland
2021-2022
We present global analyses of effective Higgs portal dark matter models in the frequentist and Bayesian statistical frameworks. Complementing earlier studies scalar portal, we use GAMBIT to determine preferred mass coupling ranges for with vector, Majorana Dirac fermion matter. also assess relative plausibility all four using model comparison. Our analysis includes up-to-date likelihood functions relic density, invisible decays, direct indirect searches weakly-interacting including latest...
Axion-like particles (ALPs) decaying into photons are known to affect a wide range of astrophysical and cosmological observables. In this study we focus on ALPs with masses in the keV-MeV lifetimes between $10^4$ $10^{13}$ seconds, corresponding decays end Big Bang Nucleosynthesis formation Cosmic Microwave Background (CMB). Using CosmoBit module global fitting framework GAMBIT, combine state-of-the-art calculations irreducible ALP freeze-in abundance, primordial element abundances...
We determine the upper limit on mass of lightest neutrino from most robust recent cosmological and terrestrial data. Marginalizing over possible effective relativistic degrees freedom at early times (${N}_{\mathrm{eff}}$) assuming normal ordering, is less than 0.037 eV 95% confidence; with inverted bound 0.042 eV. These results improve upon strength robustness other limits constrain to be barely larger largest splitting. show impacts realistic models different sources ${N}_{\mathrm{eff}}$.
We assess the status of a wide class WIMP dark matter (DM) models in light latest experimental results using global fitting framework $\textsf{GAMBIT}$. perform analysis effective field theory (EFT) operators describing interactions between gauge-singlet Dirac fermion and Standard Model quarks, gluons photon. In this bottom-up approach, we simultaneously vary coefficients 14 such up to dimension 7, along with DM mass, scale new physics several nuisance parameters. Our likelihood functions...
We introduce the GAMBIT Universal Model Machine (GUM), a tool for automatically generating code global fitting software framework GAMBIT, based on Lagrangian-level inputs. GUM accepts models written symbolically in FeynRules and SARAH formats, can use either along with MadGraph CalcHEP to generate model, collider, dark matter, decay spectrum code, as well interfaces corresponding versions of SPheno, micrOMEGAs, Pythia Vevacious (C++). In this paper we describe features, methods, usage,...
Axion-like particles (ALPs) decaying into photons are known to affect a wide range of astrophysical and cosmological observables. In this study we focus on ALPs with masses in the keV-MeV lifetimes between $10^4$ $10^{13}$ seconds, corresponding decays end Big Bang Nucleosynthesis formation Cosmic Microwave Background (CMB). Using CosmoBit module global fitting framework GAMBIT, combine state-of-the-art calculations irreducible ALP freeze-in abundance, primordial element abundances...