Now showing items 1-20 of 31

    • Black Holes and Quantum Gravity at the LHC 

      Meade, Patrick; Randall, Lisa (Spinger Verlag, 2008)
      We argue that the highly studied black hole signatures based on thermal multiparticle final states are very unlikely and only occur in a very limited parameter regime if at all. However, we show that if the higher-dimensional ...
    • Candidates for Inelastic Dark Matter 

      Cui, Yanou; Morrissey, David; Poland, David; Randall, Lisa (Springer, 2009)
      Although we have yet to determine whether the DAMA data represents a true discovery of new physics, among such interpretations inelastic dark matter (IDM) can match the energy spectrum of DAMA very well while not contradicting ...
    • Carving Out the Space of Conformal Field Theories 

      Simmons-Duffin, David (2012-12-19)
      We study the constraints of conformal symmetry and unitarity in Conformal Field Theories (CFTs). Crossing symmetry of four-point functions implies universal bounds on operator dimensions and three-point function coefficients. ...
    • Dark and Light: Unifying the Origins of Dark and Visible Matter 

      Shuve, Brian (2012-07-23)
      The Standard Model of particle physics can account for neither the dark matter dominating the universe's matter density, nor the baryon asymmetry that leads to the visible matter density. This dissertation explores models ...
    • Dark Matter as a Trigger for Periodic Comet Impacts 

      Randall, Lisa; Reece, Matthew (American Physical Society (APS), 2014)
      Although statistical evidence is not overwhelming, possible support for an approximately \(35 \times 10^6\)  yr periodicity in the crater record on Earth could indicate a nonrandom underlying enhancement of meteorite impacts ...
    • Dark-Disk Universe 

      Fan, JiJi; Katz, Andrey; Randall, Lisa; Reece, Matthew (American Physical Society (APS), 2013)
      We point out that current constraints on dark matter imply only that the majority of dark matter is cold and collisionless. A subdominant fraction of dark matter could have much stronger interactions. In particular, it ...
    • Dijet Searches for Supersymmetry at the Large Hadron Collider 

      Randall, Lisa; Tucker-Smith, David (American Physical Society, 2008)
      We present several strategies for searching for supersymmetry in dijet channels that do not explicitly invoke missing energy. Preliminary investigations suggest that signal-to-background ratios of at least 4--5 should be ...
    • A diphoton resonance from bulk RS 

      Csáki, Csaba; Randall, Lisa (Springer Nature, 2016)
      Recent LHC data hinted at a 750 GeV mass resonance that decays into two photons. A significant feature of this resonance is that its decays to any other Standard Model particles would be too low to be detected so far. Such ...
    • Dissipative dark matter and the Andromeda plane of satellites 

      Randall, Lisa; Scholtz, Jakub (IOP Publishing, 2015)
      We show that dissipative dark matter can potentially explain the large observed mass to light ratio of the dwarf satellite galaxies that have been observed in the recently identified planar structure around Andromeda, which ...
    • Double-Disk Dark Matter 

      Fan, JiJi; Katz, Andrey; Randall, Lisa; Reece, Matthew (Elsevier BV, 2013)
      Based on observational tests of large scale structure and constraints on halo structure, dark matter is generally taken to be cold and essentially collisionless. On the other hand, given the large number of particles and ...
    • Dynamical Compactification from de Sitter Space 

      Carroll, Sean M.; Johnson, Matthew C.; Randall, Lisa (Springer, 2009)
      We show that \(D\)-dimensional de Sitter space is unstable to the nucleation of non-singular geometries containing spacetime regions with different numbers of macroscopic dimensions, leading to a dynamical mechanism of ...
    • Early (and Later) LHC Search Strategies for Broad Dimuon Resonances 

      Kelley, Randall; Randall, Lisa; Shuve, Brian (Springer Verlag, 2011)
      Resonance searches generally focus on narrow states that would produce a sharp peak rising over background. Early LHC running will, however, be sensitive primarily to broad resonances. In this paper we demonstrate that ...
    • Emergent Dark Matter, Baryon, and Lepton Numbers 

      Cui, Yanou; Randall, Lisa; Shuve, Brian James (Springer, 2011)
      We present a new mechanism for transferring a pre-existing lepton or baryon asymmetry to a dark matter asymmetry that relies on mass mixing which is dynamically induced in the early universe. Such mixing can succeed with ...
    • Exothermic double-disk dark matter 

      McCullough, Matthew; Randall, Lisa (IOP Publishing, 2013)
      If a subdominant component of dark matter (DM) interacts via long-range dark force carriers it may cool and collapse to form complex structures within the Milky Way galaxy, such as a rotating dark disk. This scenario was ...
    • Exploring Black Hole Dynamics 

      Chung, Hyeyoun (2014-11-20)
      This thesis explores the evolution of different types of black holes, and the ways in which black hole dynamics can be used to answer questions about other physical systems. We first investigate the differences in ...
    • Extremal Limits and Black Hole Entropy 

      Carroll, Sean; Johnson, Matthew; Randall, Lisa (Springer, 2009)
      Taking the extremal limit of a non-extremal Reissner-Nordstrom black hole (by externally varying the mass or charge), the region between the inner and outer event horizons experiences an interesting fate--while this region ...
    • Flavor Anarchy in a Randall-Sundrum Model with 5D Minimal Flavor Violation and a Low Kaluza-Klein Scale 

      Fitzpatrick, A.; Perez, Gilad; Randall, Lisa (American Physical Society, 2008)
      A variant of a warped extra dimension model is presented. It is based on 5D minimal flavor violation, in which the only sources of flavor breaking are two 5D anarchic Yukawa matrices. These matrices also control the bulk ...
    • Flooded Dark Matter and S level rise 

      Randall, Lisa; Scholtz, Jakub; Unwin, James (Springer Science + Business Media, 2016)
      Most dark matter models set the dark matter relic density by some interaction with Standard Model particles. Such models generally assume the existence of Standard Model particles early on, with the dark matter relic density ...
    • General Analysis of Antideuteron Searches for Dark Matter 

      Cui, Yanou; Mason, John; Randall, Lisa (American Physical Society, 2010)
      Low energy cosmic ray antideuterons provide a unique low background channel for indirect detection of dark matter. We compute the cosmic ray flux of antideuterons from hadronic annihilations of dark matter for various ...
    • LHC Searches for Non-Chiral Weakly Charged Multiplets 

      Buckley, Matthew; Randall, Lisa; Shuve, Brian James (Springer Verlag, 2011)
      Because the TeV-scale to be probed at the Large Hadron Collider should shed light on the naturalness, hierarchy, and dark matter problems, most searches to date have focused on new physics signatures motivated by possible ...