A5057783487- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Distributed and Parallel Computing Systems
- Particle Detector Development and Performance
- Space Science and Extraterrestrial Life
- Pulsars and Gravitational Waves Research
- Shoulder and Clavicle Injuries
- Advanced Thermodynamics and Statistical Mechanics
- History and Developments in Astronomy
- Quantum Computing Algorithms and Architecture
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Bone health and treatments
- Earth Systems and Cosmic Evolution
- Advanced Data Storage Technologies
- Biofield Effects and Biophysics
Cork University Hospital
2024-2025
TRIUMF
2014-2024
University of Victoria
2024
Harvard University
2009-2012
University of Michigan
2005-2009
University of California, Santa Barbara
2009
Thomas Jefferson National Accelerator Facility
2009
Fermi National Accelerator Laboratory
2004-2005
University of Chicago
2004-2005
Argonne National Laboratory
2004-2005
Electroweak baryogenesis (EWBG) remains a theoretically attractive and experimentally testable scenario for explaining the cosmic baryon asymmetry. We review recent progress in computations of asymmetry within this framework discuss their phenomenological consequences. pay particular attention to methods analyzing electroweak phase transition calculating CP-violating asymmetries, development Standard Model extensions that may provide necessary ingredients EWBG, searches corresponding...
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search Hidden Particles) experiment is intended to hunt in largely unexplored domain of very weakly interacting particles with masses below Fermi scale, inaccessible LHC experiments, and study tau neutrino physics. same proton beam setup can be used later look decays tau-leptons lepton flavour number non-conservation, $\tau\to 3\mu$ search weakly-interacting sub-GeV dark matter candidates. We discuss...
This document proposes a collection of simplified models relevant to the design new-physics searches at LHC and characterization their results. Both ATLAS CMS have already presented some results in terms models, we encourage them continue expand this effort, which supplements both signature-based benchmark model interpretations. A is defined by an effective Lagrangian describing interactions small number new particles. Simplified can equally well be described masses cross-sections. These...
We examine the possibility of electroweak baryogenesis and dark matter in nMSSM, a minimal extension MSSM with singlet field. This avoids usual domain wall problem NMSSM, also appears as low energy theory models dynamical symmetry breaking so-called fat-Higgs boson. demonstrate that strong, first order phase transition, necessary for baryogenesis, may arise regions parameter space where lightest neutralino provides an acceptable candidate. investigate which these two properties are fulfilled...
We present a novel mechanism for generating both the baryon and dark matter densities of Universe. A new Dirac fermion $X$ carrying conserved number charge couples to standard model quarks as well GeV-scale hidden sector. $CP$-violating decays $X$, produced nonthermally in low-temperature reheating, sequester antibaryon sector, thereby leaving excess visible The antibaryonic states are stable matter. spectacular signature this is baryon-destroying inelastic scattering that can annihilate...
A bstract Many motivated extensions of the Standard Model predict existence cosmic strings. Gravitational waves originating from dynamics resulting string network have ability to probe many otherwise inaccessible properties early universe. In this study we show how spectrum gravitational a can be used test equation state universe prior Big Bang Nucleosynthesis (BBN). We also demonstrate that current and planned wave detectors such as LIGO, LISA, DECIGO/BBO, ET/CE potential detect signals...
Cosmic strings are generic cosmological predictions of many extensions the standard model particle physics, such as a $U(1{)}^{\ensuremath{'}}$ symmetry-breaking phase transition in early Universe or remnants superstring theory. Unlike other topological defects, cosmic can reach scaling regime that maintains small fixed fraction total energy density from very epoch until today. If present, they will oscillate and generate gravitational waves with frequency spectrum imprints dominant sources...
We investigate scenarios in which electroweak baryogenesis can occur during an exotic stage of symmetry breaking the early Universe. This transition is driven by expectation value a new scalar instead standard Higgs field. A later, second then takes system to usual minimum, dominated Higgs, while preserving baryon asymmetry created first transition. discuss general requirements for such two-stage be suitable and present toy model that illustrates necessary ingredients. apply these results...
We investigate new and unusual signals that arise in theories where dark matter is asymmetric carries a net antibaryon number, as may occur when the abundance linked to baryon abundance. Antibaryonic can cause {\it induced nucleon decay} by annihilating visible baryons through inelastic scattering. These processes lead an effective lifetime of 10^{29}-10^{32} years terrestrial decay experiments, if number transfer between sectors arises physics at weak scale. The possibility motivates novel...
In the Minimal Supersymmetric Standard Model (MSSM), a Higgs boson mass of 125 GeV can be obtained with moderately heavy scalar top superpartners provided they are highly mixed. The source this mixing, soft trilinear stop-stop-Higgs coupling, result in appearance charge- and color-breaking minima potential theory. If such vacuum exists is energetically favorable, Model-like decay to it via quantum tunnelling. work we investigate conditions under which exotic vacua arise, compute tunnelling...
Our understanding of the Universe is known to be incomplete and new gauge forces beyond those Standard Model might crucial describing its observed properties. A minimal well-motivated possibility a pure Yang-Mills non-Abelian dark force with no direct connection Model. We determine here relic abundances glueball bound states that arise in such theories investigate their cosmological effects. Glueballs are first formed confining phase transition, densities set by network annihilation transfer...
We explore the connection between strength of electroweak phase transition and properties Higgs boson. Our interest is in regions parameter space that can realize baryogenesis. do so a simplified framework which single field couples to new scalar fields charged under SU(3)_c by way portal. Such scalars make more strongly first-order, while contributing effective boson couplings gluons photons through loop effects. For masses range 115 GeV < m_h 130 GeV, whenever becomes strong enough for...
Injection of electromagnetic energy - photons, electrons, or positrons into the plasma early universe can destroy light elements created by primordial Big Bang Nucleosynthesis (BBN). The success BBN at predicting abundances has thus been used to impose stringent constraints on decay annihilation processes with primary energies near above electroweak scale. In this work we investigate from decays that inject lower energies, between 1-100 MeV. We compute cascade such injections and show it...
A standard expectation of primordial cosmological inflation is that it dilutes all relics created before its onset to unobservable levels. We present a counterexample this by demonstrating network cosmic strings diluted can regrow level potentially observable today in gravitational waves (GWs). In contrast undiluted strings, whose primary GW signals are typically the form stochastic background, leading signal from string be distinctive bursts GWs within sensitivity reach current and future...
The search for particle-like dark matter with meV-to-GeV masses has developed rapidly in the past few years. We summarize science case these searches, recent progress, and exciting upcoming opportunities. Funding Research Development a portfolio of small projects will allow community to capitalize on substantial advances theory experiment probe vast regions unexplored dark-matter parameter space coming decade.
The Minimal Supersymmetric extension of the Standard Model (MSSM) can provide correct neutralino relic abundance and baryon number asymmetry universe. Both may be efficiently generated in presence CP violating phases, light charginos neutralinos, a top squark. Due to coannihilation with stop, we find large region parameter space which density is consistent WMAP SDSS data. We perform detailed study additional constraints induced when ones required for baryogenesis, are included. explore...
New hidden particles could potentially be emitted and discovered in rare nuclear transitions. In this work, we investigate the production of vector bosons with primarily axial couplings to light quarks transitions, apply our results recent anomaly seen $^{8}\mathrm{Be}$ decays. The relevant matrix elements for ${^{8}\mathrm{Be}}^{*}({1}^{+})\ensuremath{\rightarrow}^{8}\mathrm{Be}({0}^{+})$ transitions are calculated using ab initio methods internucleon forces derived from chiral effective...
Non-Abelian dark gauge forces that do not couple directly to ordinary matter may be realized in nature. The minimal form of such a force is pure Yang-Mills theory. If the sector reheated early universe, it will as set gluons at high temperatures and collection glueballs lower temperatures, with cosmological phase transition from one other. Despite being dark, fields new can connect indirectly Standard Model through non-renormalizable operators. These operators transfer energy between visible...
New particles in theories beyond the standard model can manifest as stable relics that interact strongly with visible matter and make up a small fraction of total dark abundance. Such represent an interesting physics target since they evade existing bounds from direct detection due to their rapid thermalization high-density environments. In this work we point out annihilation inside large-volume neutrino telescopes provide new way constrain or discover such particles. The signal is most...
A very light scalar top (stop) superpartner is motivated by naturalness and electroweak baryogenesis. When the mass of stop less than sum masses quark lightest neutralino ${\ensuremath{\chi}}_{1}^{0}$, as well chargino bottom quark, dominant decay channels will be three-body (3B: $b{W}^{+}{\ensuremath{\chi}}_{1}^{0}$), four-body (4B: $bf{\overline{f}}^{\ensuremath{'}}{\ensuremath{\chi}}_{1}^{0}$), or flavor violating (FV: $c{\ensuremath{\chi}}_{1}^{0}$). In this work, we investigate direct...
The inert doublet model relies on a discrete symmetry to prevent couplings of the new scalars Standard Model fermions. This stabilizes lightest state, which can then contribute observed dark matter density. In presence additional approximate symmetries, resulting spectrum exotic be compressed. Here, we study phenomenological and cosmological implications this scenario. We derive limits compressed from LEP, outline prospects for exclusion discovery at experiments, LHC, future colliders.