Phenomenology 2018 Symposium

Session

DM IV

23

8 May 2018, 16:30

G-30 (Benedum Hall)

503. Dynamical Dark Matter from Thermal Freeze-Out

Brooks Thomas (Lafayette College)

08/05/2018, 16:30

parallel talk

In the Dynamical Dark Matter (DDM) framework, the dark sector comprises a large number of constituent particles whose individual masses, lifetimes, and cosmological abundances scale with respect to each other in specific ways. Thus far, DDM model-building has primarily relied on non-thermal mechanisms for abundance generation such as misalignment production, since these mechanisms give rise...

569. Bremsstrahlung in Direct Detection

Prof. James Dent (Sam Houston State University)

08/05/2018, 16:45

parallel talk

I will discuss the possibility of bremsstrahlung of a photon or dark sector particle being the leading order process for the direct detection of dark matter within the effective field theory framework. It will be shown under what circumstances a bremsstrahlung process could possibly alleviate momentum suppression or spin-dependence of the interactions.

520. Self-Destructing Dark Matter

Ofri Telem

08/05/2018, 17:00

parallel talk

We present Self-Destructing Dark Matter (SDDM), a new class of dark matter models which are detectable in large neutrino detectors. In this class of models, a component of dark matter can transition from a long-lived state to a short-lived one by scattering off of a nucleus or an electron in the Earth. The short-lived state then decays to Standard Model particles, generating a dark matter...

485. Partially Cannibalistic Dark Matter

Manuel Buen-Abad (Boston University)

08/05/2018, 17:15

parallel talk

Cannibals are dark matter particles with a scattering process that allows three particles to annihilate to two. This exothermic process keeps the gas of the remaining particles warm long after they become non-relativistic. A cannibalizing dark sector which is decoupled from the Standard Model naturally arises from a pure-glue confining hidden sector. It has an effective field theory...

489. A Combined Astrophysical and Dark Matter Interpretation of the IceCube HESE and Throughgoing Muon Events

Yicong Sui (Washington University in Saint Louis)

08/05/2018, 17:30

parallel talk

We perform a combined likelihood analysis for IceCube 6-year High-Energy Starting Events (HESE) and 8-year throughgoing muon events using a two-component neutrino flux model. This can be motivated either from purely astrophysical sources or due to a beyond Standard Model contribution, such as decaying heavy dark matter. We find that the astrophysical plus dark matter interpretation is mildly...

575. Freeze-in dark matter from Clockwork constructions.

08/05/2018, 17:45

parallel talk

The clockwork mechanism is a powerful technique to "naturally" generate
exponentially small couplings. One of the physical instances where we require exponentially small couplings are in a freeze-in scenarios of dark matter. I will
discuss the phenomenology of freeze-in dark matter and how the clockwork mechanism
can be used to generate viable freeze-in models.

587. Spontaneous Leptogenesis in Continuum-Clockwork Axion Models

Dr Jeff Kost (IBS-CTPU)

08/05/2018, 18:00

parallel talk

The mechanism of “spontaneous leptogenesis” — in which the matter-antimatter asymmetry is generated via motion of a scalar field coupled to the electroweak gauge bosons — provides an interesting alternative to more traditional thermal leptogenesis models. While an axion-like field is a natural candidate for these models, the observed asymmetry requires an axion mass so large it decays shortly...

582. Dark matters, massive graviton, galaxy cluster and extended standard model

Dr Jae-kwang Hwang (JJJ Physics Laboratory)

08/05/2018, 18:15

parallel talk

The properties of the dark matters, massive graviton and galaxy clusters are discussed in terms of the new three-dimensional quantized space model. Three new particles (bastons) with the electric charges (EC) are proposed as the dark matters [1]. And the rest mass of 1.4 TeV/c2 is assigned to the Le particle with the EC charge of -2e based on the data of DAMP (Dark Matter Particle Explorer)...