Professional Education


  • Bachelor of Arts, University of Cambridge (2014)
  • Master of Mathematics, University of Cambridge (2014)
  • Doctor of Philosophy, University of Oxford (2016)

All Publications


  • Black hole mergers and the QCD axion at Advanced LIGO PHYSICAL REVIEW D Arvanitaki, A., Baryakhtar, M., Dimopoulos, S., Dubovsky, S., Lasenby, R. 2017; 95 (4)
  • Black hole superradiance signatures of ultralight vectors Physical Review D Baryakhtar, M., Lasenby, R., Teo, M. 2017
  • Twin Higgs WIMP dark matter PHYSICAL REVIEW D Garcia, I., Lasenby, R., March-Russell, J. 2015; 92 (5)
  • Twin Higgs Asymmetric Dark Matter PHYSICAL REVIEW LETTERS Garcia, I., Lasenby, R., March-Russell, J. 2015; 115 (12): 121801

    Abstract

    We study asymmetric dark matter (ADM) in the context of the minimal (fraternal) twin Higgs solution to the little hierarchy problem, with a twin sector with gauged SU(3)^{'}×SU(2)^{'}, a twin Higgs doublet, and only third-generation twin fermions. Naturalness requires the QCD^{'} scale Λ_{QCD}^{'}≃0.5-20  GeV, and that t^{'} is heavy. We focus on the light b^{'} quark regime, m_{b^{'}}≲Λ_{QCD}^{'}, where QCD^{'} is characterized by a single scale Λ_{QCD}^{'} with no light pions. A twin baryon number asymmetry leads to a successful dark matter (DM) candidate: the spin-3/2 twin baryon, Δ^{'}∼b^{'}b^{'}b^{'}, with a dynamically determined mass (∼5Λ_{QCD}^{'}) in the preferred range for the DM-to-baryon ratio Ω_{DM}/Ω_{baryon}≃5. Gauging the U(1)^{'} group leads to twin atoms (Δ^{'}-τ^{'}[over ¯] bound states) that are successful ADM candidates in significant regions of parameter space, sometimes with observable changes to DM halo properties. Direct detection signatures satisfy current bounds, at times modified by dark form factors.

    View details for PubMedID 26430985

  • Signatures of large composite Dark Matter states JOURNAL OF HIGH ENERGY PHYSICS Hardy, E., Lasenby, R., March-Russell, J., West, S. M. 2015
  • Big Bang synthesis of nuclear dark matter JOURNAL OF HIGH ENERGY PHYSICS Hardy, E., Lasenby, R., March-Russell, J., West, S. M. 2015