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A Supersymmetric Theory of Baryogenesis and Sterile Sneutrino Dark Matter from Mesons
Gonzalo Alonso-Álvarez, Gilly Elor, Ann E. Nelson +1
Low-scale baryogenesis and dark matter generation can occur via the production of neutral mesons at MeV temperatures in the early Universe, which undergo CP-violating oscillati…
Lattice-Friendly Gauge Completion of a Composite Higgs with Top Partners
Helene Gertov, Ann E. Nelson, Ashley Perko +1
We give an explicit example of a composite Higgs model with a pseudo-Nambu-Goldstone Higgs in which the top Yukawa coupling is generated via the partial compositeness mechanism. Th…
Baryogenesis from B Meson Oscillations
Ann E. Nelson, Huangyu Xiao
We show how CP violating B meson oscillations in conjunction with baryon number violating decays can generate the cosmological asymmetry between matter and anti-matter, and explore…
Composite Higgs Models with a Hidden Sector
Ann Nelson, Michael Park, Devin Walker
We discuss the phenomenology of composite Higgs models that naturally produce a Standard Model-like Higgs boson with a mass of GeV. The effective theory below the compositene…
Baryogenesis and Dark Matter from Mesons
Gilly Elor, Miguel Escudero, Ann E. Nelson
We present a new mechanism of Baryogenesis and dark matter production in which both the dark matter relic abundance and the baryon asymmetry arise from neutral meson oscillatio…
Reducing the Quadratic Divergence in the Higgs Mass Squared Without Top Partners
Sonia El Hedri, Ann E. Nelson, Devin G. E. Walker
We examine a model with multiple scalar fields to see whether it is possible to reduce the fine- tuning of the SM Higgs mass without introducing low scale top partners. Our approac…
Dark halos around neutron stars and gravitational waves
Ann Nelson, Sanjay Reddy, Dake Zhou
We find that a class of models of MeV-GeV dark matter in which dark matter interacts strongly can be constrained by the observation of gravitational waves from neutron star mergers…
Neutron stars exclude light dark baryons
David McKeen, Ann E. Nelson, Sanjay Reddy +1
Exotic new particles carrying baryon number and with mass of order the nucleon mass have been proposed for various reasons including baryogenesis, dark matter, mirror worlds, and t…
Hidden-Sector Spectroscopy with Gravitational Waves from Binary Neutron Stars
Djuna Croon, Ann E. Nelson, Chen Sun +2
We show that neutron star binaries can be ideal laboratories to probe hidden sectors with a long range force. In particular, it is possible for gravitational wave detectors such as…
Baryogenesis from Oscillations of Charmed or Beautiful Baryons
Kyle Aitken, David McKeen, Ann E. Nelson +1
We propose a model for CP violating oscillations of neutral, heavy-flavored baryons into antibaryons at rates which are within a few orders of magnitude of their lifetimes. The fla…
Relaxion: A Landscape Without Anthropics
Ann Nelson, Chanda Prescod-Weinstein
The relaxion mechanism provides a potentially elegant solution to the hierarchy problem without resorting to anthropic or other fine-tuning arguments. This mechanism introduces an…
Probing nonstandard neutrino cosmology with terrestrial neutrino experiments
Akshay Ghalsasi, David McKeen, Ann E. Nelson
Neutrino masses and the number of light neutrino species can be tested in a variety of laboratory experiments and also can be constrained by particle astrophysics and precision cos…
750 GeV Diphotons from Supersymmetry with Dirac Gauginos
Timothy Cohen, Graham D. Kribs, Ann E. Nelson +1
Motivated by the recent excess in the diphoton invariant mass near 750 GeV, we explore a supersymmetric extension of the Standard Model that includes the minimal set of superpartne…
CP Violating Baryon Oscillations
David McKeen, Ann E. Nelson
We enumerate the conditions necessary for violation to be manifest in - oscillations, and build a simple model that can give rise to such effects. We discuss a poss…
Baryogenesis via Mesino Oscillations
Akshay Ghalsasi, David McKeen, Ann E. Nelson
We propose a new mechanism for baryogenesis at the 1-200 MeV scale. Enhancement of CP violation takes place via interference between oscillations and decays of mesinos--bound state…
New Supersoft Supersymmetry Breaking Operators and a Solution to the Problem
Ann E. Nelson, Tuhin S. Roy
We propose the framework, "generalized supersoft supersymmetry breaking". "Supersoft" models, with -type supersymmetry breaking and heavy Dirac gauginos, are considerably less c…
Reducing cosmological small scale structure via a large dark matter-neutrino interaction: constraints and consequences
Bridget Bertoni, Seyda Ipek, David McKeen +1
Cold dark matter explains a wide range of data on cosmological scales. However, there has been a steady accumulation of evidence for discrepancies between simulations and observati…
CP Violation in Pseudo-Dirac Fermion Oscillations
Seyda Ipek, David McKeen, Ann E. Nelson
Supersymmetric theories with a symmetry have Dirac gauginos, solve the supersymmetric flavor and CP problems, and have distinctive collider signatures. However when superg…
Effects of Mass Varying Neutrinos on Cosmological Parameters as determined from the Cosmic Microwave Background
Akshay Ghalsasi, Ann E. Nelson
In models with a light scalar field (the `acceleron') coupled to neutrinos, neutrino masses depend on neutrino density. The resulting coupled system of mass varying neutrinos (MaVa…
A Renormalizable Model for the Galactic Center Gamma Ray Excess from Dark Matter Annihilation
Seyda Ipek, David McKeen, Ann E. Nelson
Evidence for an excess of gamma rays with O(GeV) energy coming from the center of our galaxy has been steadily accumulating over the past several years. Recent studies of the exces…
Heavy Flavor & Dark Sector
Ann E. Nelson, Jakub Scholtz
We consider some contributions to rare processes in meson decays from a Dark Sector containing 2 light unstable scalars, with large couplings to each other and small mixings wi…
Snowmass Cosmic Frontiers 6 (CF6) Working Group Summary --The Bright Side of the Cosmic Frontier: Cosmic Probes of Fundamental Physics
J. J. Beatty, A. E. Nelson, A. Olinto +62
Report of the CF6 Working Group at Snowmass 2013. Topics addressed include ultra-high energy cosmic rays, neutrinos, gamma rays, baryogenesis, and experiments probing the fundament…
Dark Matter Thermalization in Neutron Stars
Bridget Bertoni, Ann E. Nelson, Sanjay Reddy
We study how many-body effects alter the dark matter (DM) thermalization time inside neutron stars. We find that Pauli blocking, kinematic constraints, and superfluidity and superc…
MeV dark matter in the 3+1+1 model
Jinrui Huang, Ann E Nelson
The existence of light sterile neutrinos in the eV mass range with relatively large mixing angles with the active neutrinos has been proposed for a variety of reasons, including to…