Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session K13: Dark Sector and Neutrino Theory |
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Sponsoring Units: GPMFC DPF Chair: JoAnne Hewett, SLAC National Accelerator Laboratory Room: 101 |
Sunday, April 6, 2014 1:30PM - 1:42PM |
K13.00001: Dark Matter Particles Interacting via a Higgs Field Jurij Darewych, Alexander Chigodaev We study a system of two dark-matter particles, treated as scalars, interacting via a Higgs-type mediating field. The variational method in a reformulated Hamiltonian formalism of Quantum Field Theory is used to derive relativistic two-body wave equations. The nature of the interactions is studied, including the non-relativistic limit. Approximate solutions of the two-body equations are presented. [Preview Abstract] |
Sunday, April 6, 2014 1:42PM - 1:54PM |
K13.00002: Viable dark matter via radiative symmetry breaking in a Higgs portal extension of the standard model Zhi-Wei Wang, Tom Steele, Robb Mann, Dagoberto Contreras We consider generation of dark matter mass via radiative electroweak symmetry breaking in an extension of the conformal Standard Model containing a singlet scalar field with a Higgs portal interaction. Generating the mass from a sequential process of radiative electroweak symmetry breaking followed by a conventional Higgs mechanism can account for less than 30\% of the cosmological dark matter abundance. However in a dynamical approach where both Higgs and scalar singlet masses are generated via radiative electroweak symmetry breaking we obtain much higher levels of dark matter abundance: 10\%--80\% for a dark matter mass of $80\,{\rm GeV} |
Sunday, April 6, 2014 1:54PM - 2:06PM |
K13.00003: Majorana Physics Through the Cabibbo Haze Jennifer Kile, Michael Perez, Pierre Ramond, Jue Zhang We present a model in which the Supersymmetric Standard Model is augmented by the family symmetry $Z_7 Z_3$. Motivated by $SO(10)$, where the charge two-thirds and neutral Dirac Yukawa matrices are related, we propose, using family symmetry, a special form for the seesaw Majorana matrix; it contains a squared correlated hierarchy, allowing it to mitigate the severe hierarchy of the quark sector. It is reproduced naturally by the invariant operators of $Z_7 Z_3$, with the hierarchy carried by familon fields. In addition to relating the hierarchy of the $\Delta I_{\rm w}=1/2$ to the $\Delta I_{\rm w}=0$ sector, it contains a Gatto-Sartori-Tonin like relation, predicts a normal hierarchy for Tri-bimaximal and Golden Ratio mixings, and gives specific values for the light neutrino masses. [Preview Abstract] |
Sunday, April 6, 2014 2:06PM - 2:18PM |
K13.00004: Democratic Neutrino Paradigm Dmitry Zhuridov I will introduce a democratic neutrino theory, which sets the absolute scale of the neutrino masses at about 0.03 eV, and has only one free parameter in contrast to 7 (9) free parameters in the conventional model of Dirac (Majorana) neutrino masses and mixing. Taking into account the incoherence and matter effects, this democratic theory agrees with the atmospheric and solar neutrino data. I will discuss the predictions of this theory for low energy beta decays, magnetic moments, and neutrinoless double beta decays. Finally, I will introduce the fundamental basis for this theory and, in general, for all constituents of matter. [Preview Abstract] |
Sunday, April 6, 2014 2:18PM - 2:30PM |
K13.00005: Accommodate the Neutrino Mixing Angle $\theta_{13}$ within SU(5) Jue Zhang, Jennifer Kile, Jay Perez, Pierre Ramond Tri-bimaximal, Golden Ratio or Bimaximal matrix has long been considered as a good leading order parametrization for the neutrino mixing matrix. However, the recent discovery of non-zero $\theta_{13}$ neutrino mixing angle requires corrections to these leading order parametrizations. Those corrections may come from the quark sector, as in Grand Unified Theories Yukawa couplings of quarks and leptons are closely related. To explore this possibility, we perform a numerical search with the guidance of SU(5), and indeed find some solutions that can accommodate current neutrino data. [Preview Abstract] |
Sunday, April 6, 2014 2:30PM - 2:42PM |
K13.00006: Collective Neutrino Oscillations Shashank Shalgar, Huaiyu Duan The large neutrino flux emitted during core-collapse supernovae leads to neutrino self-interaction. The presence of neutrino self-interaction is the cause for interesting non-linear evolution of neutrino flavor. This offers a unique probe for neutrino properties. However, due to the non-linear nature, there are challenges in the computation of flavor evolution even in the simplest case. We discuss the physics impact of supernova neutrinos, the challenges involved, and potential improvements in methods for computation of neutrino flavor evolution in core-collapse supernovae. [Preview Abstract] |
Sunday, April 6, 2014 2:42PM - 2:54PM |
K13.00007: Constraints on quark interactions with light dark matter Bogdan Dobrescu, Claudia Frugiuele We explore how strongly can dark matter interact with quarks. We concentrate on dark matter particles of mass below 5 GeV, which are poorly constrained by direct detection searches. The theoretical constraints (such as those imposed by anomaly cancellation) are interwoven with experimental ones (such as those from searches for vector-like quarks). We present renormalizable theories that alleviate those constraints, and then we propose some experimental tests using neutrino detectors. [Preview Abstract] |
Sunday, April 6, 2014 2:54PM - 3:06PM |
K13.00008: Two Fundamental Principles of Nature's Interactions Tian Ma, Shouhong Wang In this talk, we present two fundamental principles of nature's interactions, the principle of interaction dynamics (PID) and the principle of representation invariance (PRI). Intuitively, PID takes the variation of the action functional under energy-momentum conservation constraint. PID offers a completely different and natural way of introducing Higgs fields. PRI requires that physical laws be independent of representations of the gauge groups. These two principles give rise to a unified field model for four interactions, which can be naturally decoupled to study individual interactions. With these two principles, we are able to derive 1) a unified theory for dark matter and dark energy, 2) layered strong and weak interaction potentials, and 3) the energy levels of subatomic particles. [Preview Abstract] |
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