65 citations · 178 across the 8 of their papers we have counts for
8 papers
Custodial symmetry violation in the Georgi-Machacek model
Ben Keeshan, Heather E. Logan, Terry Pilkington
We study the effects of custodial symmetry violation in the Georgi-Machacek (GM) model. The GM model adds isospin-triplet scalars to the Standard Model in a way that preserves cust…
Dark matter in the Georgi-Machacek model with an additional inert doublet
Terry Pilkington
We study a model that extends the Georgi-Machacek model by the addition of an inert doublet, . This allows for the model to contain a natural dark matter candidate, . For…
Large scalar multiplet dark matter in the high-mass region
Heather E. Logan, Terry Pilkington
We study two models of scalar dark matter from "large" electroweak multiplets with isospin 5/2 (n=6 members) and 7/2 (n=8), whose scalar potentials preserve a symmetry. Becau…
LHC constraints on large scalar multiplet models with a symmetry
Heather E. Logan, Travis A. Martin, Terry Pilkington
We study the LHC search constraints on models that extend the Standard Model (SM) with an inert, complex scalar electroweak multiplet, , with isospin T=5/2 (sextet) or T=7/2 (oc…
Two viable large scalar multiplet models with a Z2 symmetry
Kevin Earl, Katy Hartling, Heather E. Logan +1
We study models in which the Higgs sector is extended by a single scalar electroweak multiplet Z with isospin T=5/2 (sextet) or 7/2 (octet) and the same hypercharge as the Standard…
Constraining models with a large scalar multiplet
Kevin Earl, Katy Hartling, Heather E. Logan +1
Models in which the Higgs sector is extended by a single electroweak scalar multiplet X can possess an accidental global U(1) symmetry at the renormalizable level if X has isospin…
Constraints on large scalar multiplets from perturbative unitarity
Katy Hally, Heather E. Logan, Terry Pilkington
We determine the constraints on the isospin and hypercharge of a scalar electroweak multiplet from partial-wave unitarity of tree-level scattering diagrams. The constraint from SU(…
Trapped and marginally trapped surfaces in Weyl-distorted Schwarzschild solutions
Terry Pilkington, Alexandre Melanson, Joseph Fitzgerald +1
To better understand the allowed range of black hole geometries, we study Weyl-distorted Schwarzschild solutions. They always contain trapped surfaces, a singularity and an isolate…