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A Morphological Study of Gamma-Ray Burst Host Galaxies
We present a comprehensive study of the morphological properties of 42 γ-ray burst (GRB) host galaxies imaged with the Hubble Space Telescope in the optical band. The purpose of this study is to
Singlet-catalyzed electroweak phase transitions and precision Higgs boson studies
We update the phenomenology of gauge-singlet extensions of the Standard Model scalar sector and their implications for the electroweak phase transition. Considering the introduction of one real
Cosmological phase transitions and their properties in the NMSSM
A bstractWe study cosmological phase transitions in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) in light of the Higgs discovery. We use an effective field theory approach to calculate
Singlet scalar dark matter: Monochromatic gamma rays and metastable vacua
We calculate the pair-annihilation cross section of real scalar singlet dark matter into two monoenergetic photons. We derive constraints on the theory parameter space from the Fermi limits on
Gravity waves from a cosmological phase transition: Gauge artifacts and daisy resummations
The finite-temperature effective potential customarily employed to describe the physics of cosmological phase transitions often relies on specific gauge choices, and is manifestly not gauge invariant
Phase Transitions in the Early Universe
I explore the theory and computation of early-Universe finite-temperature phase transitions involving scalar fields. I focus primarily on the electroweak phase transition, but some of the methods I
Electroweak Baryogenesis And The Fermi Gamma-Ray Line
Many particle physics models attempt to explain the 130 GeV gamma-ray feature that the Fermi-LAT observes in the Galactic Center. Neutralino dark matter in non-minimal supersymmetric models, such as
Supersymmetric Electroweak Baryogenesis Via Resonant Sfermion Sources
We calculate the baryon asymmetry produced at the electroweak phase transition by quasidegenerate third-generation sfermions in the minimal supersymmetric extension of the Standard Model. We evaluate
Simulating the universe(s): from cosmic bubble collisions to cosmological observables with numerical relativity
The theory of eternal inflation in an inflaton potential with multiple vacua predicts that our universe is one of many bubble universes nucleating and growing inside an ever-expanding false vacuum.