Classical quasiparticle dynamics and chaos in trapped Bose condensates

In the short wavelength limit the Bogoliubov quasiparticles of trapped Bose-Einstein condensates can be described as classical particles and antiparticles with dynamics in a mixed phase-space. For anisotropic parabolic traps we determine the location of the resonances and study the influence of the sharpness of the condensate surface on the appearance of chaos as the energy of the quasiparticles is lowered from values much larger than to values comparable with the chemical potential.Comment: 20 pages, 4 figure

Dirac Gauginos in Supersymmetry -- Suppressed Jets + MET Signals: A Snowmass Whitepaper

We consider the modifications to squark production in the presence of a naturally heavier Dirac gluino. First generation squark production is highly suppressed, providing an interesting but challenging signal find or rule out. No dedicated searches for supersymmetry with a Dirac gluino have been performed, however a reinterpretation of a "decoupled gluino" simplified model suggests the bounds on a common first and second generation squark mass is much smaller than in the MSSM: \lsim 850 GeV for a massless LSP, and no bound for an LSP heavier than about 300 GeV. We compare and contrast the squark production cross sections between a model with a Dirac gluino and one with a Majorana gluino, updating earlier results in the literature to a $pp$ collider operating at $\sqrt{s} = 14$ and 33 TeV. Associated production of squark+gluino is likely very small at $\sqrt{s} = 14$ TeV, while is a challenging but important signal at even higher energy $pp$ colliders. Several other salient implications of Dirac gauginos are mentioned, with some thought-provoking discussion as it regards the importance of the various experiments planned or proposed.Comment: 10 pages, 6 figures; this Snowmass Whitepaper has been submitted to arXiv at the request of the Snowmass convener

More than a Match: The Role of Football in Britain’s Deaf Community

The University of Central Lancashire has undertaken a major research project into the role of football within the deaf community in Britain. As well as reconstructing the long history of deaf involvement in football for the first time, the project has also focused on the way in which football has provided deaf people with a means of developing and maintaining social contacts within the community, and of expressing the community’s cultural values. This article will draw on primary data gathered from interviews conducted with people involved in deaf football in a variety of capacities. During the course of these interviews, a number of themes and issues emerged relating to the values and benefits those involved with deaf football place on the game, and it is these which are explored here

Natural Supersymmetry and Implications for Higgs physics

We re-analyze the LHC bounds on light third generation squarks in Natural Supersymmetry, where the sparticles have masses inversely proportional to their leading-log contributions to the electroweak symmetry breaking scale. Higgsinos are the lightest supersymmetric particles; top and bottom squarks are the next-to-lightest sparticles that decay into both neutral and charged Higgsinos with well-defined branching ratios determined by Yukawa couplings and kinematics. The Higgsinos are nearly degenerate in mass, once the bino and wino masses are taken to their natural (heavy) values. We consider three scenarios for the stop and sbottom masses: (I) $\tilde{t}_R$ is light, (II) $\tilde{t}_L$ and $\tilde{b}_L$ are light, and (III) $\tilde{t}_R$, $\tilde{t}_L$, and $\tilde{b}_L$ are light. Dedicated stop searches are currently sensitive to Scenarios II and III, but not Scenario I. Sbottom-motivated searches ($2 b + \rm{MET}$) impact both squark flavors due to \tilde{t} \ra b \charp_1 as well as \tilde{b} \ra b \neut_{1,2}, constraining Scenarios I and III with somewhat weaker constraints on Scenario II. The totality of these searches yield relatively strong constraints on Natural Supersymmetry. Two regions that remain are: (1) the "compressed wedge", where $(m_{\tilde{q}} - |\mu|)/m_{\tilde{q}} \ll 1$, and (2) the "kinematic limit" region, where m_{\tilde{q}} \gsim 600-750 GeV, at the kinematic limit of the LHC searches. We calculate the correlated predictions for Higgs physics, demonstrating that these regions lead to distinct predictions for the lightest Higgs couplings that are separable with \simeq 10% measurements. We show that these conclusions remain largely unchanged once the MSSM is extended to the NMSSM in order to naturally obtain a large enough mass for the lightest Higgs boson consistent with LHC data.Comment: 18 pages, 8 figure

PropBase QueryLayer : a single portal to UK physical property databases (extended abstract)

As the host institution of the National Geoscience Data Centre (NGDC), the British Geological Survey (BGS) holds significant volumes of subsurface data on behalf of the UK. These are derived both from the BGS�fs own data collection for research programmes, collected over many decades, and also as the national repository of data collected for other, often commercial, purposes deposited in the NGDC as a place of national deposit under statutory and other obligations. With the changing environment ensuring the security of the most basic requirements for human life, including the availability of potable groundwater, requires successful utilisation of finite resources from the subsurface, which in turn requires an ever greater understanding of the physical properties of the subsurface of the UK landmass. BGS has already moved from a mapping to a modelling paradigm, where the �gfundamental product�h of all of BGS�fs outputs is no longer represented as a two dimensional (2D) paper map but as a computer visualised three�]dimensional (3D) framework model. (Figure 1: an example 3D geological framework model). These show the geometric location of the subsurface information, realistically represented with shells or volumes representing geologically defined units. The next phase of this continuing process is to populate these geometric volumes with physical properties information that describe the heterogeneity of the subsurface. Understanding the physical properties data is vital for the undertaking of the behaviour of the subsurface, and is directly relevant to understanding the composition and behaviour of the rocks and fluids underground. This is of enormous vast societal and economic importance, and of increase. Understanding of the subsurface heterogeneity of the UK, in particular the changes in attributes such as porosity and rock �gstrength�h are of increasing importance in understanding the opportunities and threats represented by our subsurface. Once incorporated into the framework model this will be voxelated to demonstrate variation of property within the geometry (Figure 2). BGS has for many years stored all digital scientific analysis and records in relational databases to ensure the long�]term continuity of this information. However the structure of these databases is, by necessity, complex; each database, as well as containing positional reference data and model information, also contained metadata such as sample identification information and attributes that define the source and sample processing. Such metadata is critical to detailed assessment of the value of these analyses. It is however also hugely complicating for a simple understanding of variation of the physical property under assessment. Given that the UK�es populated areas are mostly underlain by clastic sedimentary rocks, understanding the variability of porosity is fundamental to understanding the nature of these rocks. However porosity data has been measured in a significant variety of ways, for a significant variety of end�]uses over a long period of time. This means that the extraction of physical properties from these databases for a first look at understanding porosity is difficult; therefore the PropBase Query Layer has been created to allow a simplified aggregation of and extraction of all related data. The concept of the Query Layer is the presentation of complex data in simple, often denormalized, tables. The PropBase Query Layer brings together property information from various databases (each with its own database structure that reflects the nature of the data) into a single system. This means that data from all of the BGS�fs subsurface data holdings can be viewed together in simple interfaces. Technical descriptions of the Query Layer (denormalized layer) The PropBase data architecture is based around the concept of a query layer to present complex data in a simple but often denormalized set of tables and other programmable units within a relational database system. The query layer brings together property information from various databases each with their own relational structure into a generalised structure, so that there's a single consistent point of access of the data for any applications that may require the data. The query layer is implemented within an Oracle relational database system where the source databases also reside or are re�]engineered into to facilitate easy loading of the data. The denormalization techniques used to build the query layer are not unique to Oracle and can be implemented on other RDBMS (Relational database management system). The query layer structure comprises a set of tables, procedures, functions, triggers, views and possibly materialised views. The structure contains a main table PRB_DATA which contains all of the data with the following attribution: . a unique identifier for each record . the source of the data . the corresponding unique identifier of the record from its parent database for traceability. . the geographic co�]ordinates of the record . the depth values . the type of property . the value of the property . the units of measure . the appropriate qualifiers . precision values and a full audit trail for the record The data source, property type and units of measure are constrained by a series of dictionaries collated from the values used in the different databases from which data is extracted to populate the query layer. The property dictionary is a key component of the structure as this defines what properties and inherit hierarchies are to be coded and also guides the process as to what and how these are extracted from the structure. The data model (Figure 3) shows that the structure also contains a child table PRB_DATA_COORD that holds secondary geographic co�]ordinates in different projections from the primary record in the PRB_DATA table for a given record. This allows for the presentation of a property with its location in the primary projection and any others as maybe recorded in the database. The structure incorporates a level of flexibility because of the it's simplistic structure that enables us to add on any extra tables required linked off the main PRB_DATA table to capture extra attribution with a 1�]to�]many relationship or even a 1�]to�]1 if adding any extra attributes to the main table comprises the simplicity of the structure. In a similar vein to adding the capability to hold primary and secondary co�]ordinates references for a record at different projections, the structure also incorporates a GROUND_REFERENCE table that allows secondary ground reference information at different surface level data to be recorded in a separate table to the primary record held in the main table. The surface level datum attribute in this extra table is constrained by a dictionary of such surface level datum types. Given the size of the denormalized structure and the many property types and their values from various data sources, it's important that there's a co�]ordinated technical approach to keep the layer synchronised. The query layer therefore makes use of oracle procedures written in PL/SQL containing the logic to carry out the data manipulation (inserts, updates, deletes) to keep the layer synchronised with the underlying databases. These procedures and/or packages are run as scheduled jobs at regular intervals (weekly, monthly etc.) or can be invoked on demand. Implications for need to improve BGS database structures Several databases have been in operation for 10�]15 years without review. Work on PropBase has further identified redundancy within the data structures, data quality issues and opportunities for where improvement to the database structure that will not only allow delivery of information more effectively but also improve data quality at little cost. Conclusions The implementation of the PropBase QueryLayer has enabled BGS to find display and interpret more dataset with greater ease, massively simplifying the process of populating 3D framework models volumes with physical properties for parameterisation and study of geological intra�]unit heterogeneity. This has enabled more rapid data discovery and population of 3D models with data held in our databases, enabling different datasets to be easily compared improving the data verification process. This technology will assist BGS is continuing to be one of the world leading national geological surveys

Signals for gauge-mediated supersymmetry breaking models at the CERN LEP2 collider

We consider a general class of models with gauge-mediated supersymmetry breaking in which the gravitino is the lightest supersymmetric particle. Several qualitatively different scenarios arise for the phenomenology of such models, depending on which superpartner(s) decay dominantly to the gravitino. At LEP2, neutralino pair production and slepton pair production can lead to a variety of promising discovery signals, which we systematically study. We investigate the impact of backgrounds for these signals and show how they can be reduced, and outline the effects of model parameter variations on the discovery potential.Comment: 36 pages, LaTeX, 10 figures embedded using epsf.sty (published version; minor changes in wording

Split Dirac Supersymmetry: An Ultraviolet Completion of Higgsino Dark Matter

Motivated by the observation that the Higgs quartic coupling runs to zero at an intermediate scale, we propose a new framework for models of split supersymmetry, in which gauginos acquire intermediate scale Dirac masses of $\sim 10^{8-11}$ GeV. Scalar masses arise from one-loop finite contributions as well as direct gravity-mediated contributions. Like split supersymmetry, one Higgs doublet is fine-tuned to be light. The scale at which the Dirac gauginos are introduced to make the Higgs quartic zero is the same as is necessary for gauge coupling unification. Thus, gauge coupling unification persists (nontrivially, due to adjoint multiplets), though with a somewhat higher unification scale $\gtrsim 10^{17}$ GeV. The $\mu$-term is naturally at the weak scale, and provides an opportunity for experimental verification. We present two manifestations of Split Dirac Supersymmetry. In the "Pure Dirac" model, the lightest Higgsino must decay through R-parity violating couplings, leading to an array of interesting signals in colliders. In the "Hypercharge Impure" model, the bino acquires a Majorana mass that is one-loop suppressed compared with the Dirac gluino and wino. This leads to weak scale Higgsino dark matter whose overall mass scale, as well as the mass splitting between the neutral components, is naturally generated from the same UV dynamics. We outline the challenges to discovering pseudo-Dirac Higgsino dark matter in collider and dark matter detection experiments.Comment: 30 pages, 5 figure

Electroweak Baryogenesis in R-symmetric Supersymmetry

We demonstrate that electroweak baryogenesis can occur in a supersymmetric model with an exact R-symmetry. The minimal R-symmetric supersymmetric model contains chiral superfields in the adjoint representation, giving Dirac gaugino masses, and an additional set of "R-partner" Higgs superfields, giving R-symmetric \mu-terms. New superpotential couplings between the adjoints and the Higgs fields can simultaneously increase the strength of the electroweak phase transition and provide additional tree-level contributions to the lightest Higgs mass. Notably, no light stop is present in this framework, and in fact, we require both stops to be above a few TeV to provide sufficient radiative corrections to the lightest Higgs mass to bring it up to 125 GeV. Large CP-violating phases in the gaugino/higgsino sector allow us to match the baryon asymmetry of the Universe with no constraints from electric dipole moments due to R-symmetry. We briefly discuss some of the more interesting phenomenology, particularly of the of the lightest CP-odd scalar.Comment: 17 pages, 8 figure