Conveners
DM II
- Sandra Robles (Fermilab)
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Edward Ramirez09/05/2023, 14:00Dark Matter
We use a catalogue of stellar binaries with wide separations (up to 1 pc) identified by the Gaia satellite to constrain the presence of extended substructure within the Milky Way galaxy. Heating of the binaries through repeated encounters with substructure results in a characteristic distribution of binary separations, allowing constraints to be placed independent of the formation mechanism...
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Eric Putney09/05/2023, 14:15Dark Matter
Density estimation utilizing normalizing flows enables novel data-driven analyses of galactic dynamics. We train Masked Autoregressive Flows on the kinematic coordinates of 6 million nearby bright stars from the Gaia DR3 catalog within 4 kpc of the Solar location to learn their underlying phase space distribution f(x,v). Assuming dynamic equilibrium, we use f to estimate the local acceleration...
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Xiaowei Ou09/05/2023, 14:30Dark Matter
The circular velocity curve, one of the first pieces of evidence for dark matter (DM), is a direct probe of the Galaxy’s potential, which allows studies of the nature of DM. Recent large surveys have provided valuable information for determining the Milky Way circular velocity curve. In this talk, I will describe our newly-derived circular velocity curve of the Milky Way out to ~30 kpc, which...
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Yilda Boukhtouchen (Queen’s University)09/05/2023, 14:45Dark Matter
In this talk, we discuss a baryonic feedback mechanism induced by dark matter ignition of white dwarf populations, and its potential effects on galaxy evolution and star formation. Previous works have shown that Type Ia supernova ignitions of sub-Chandrasekhar white dwarfs may be caused by asymmetric dark matter captured within white dwarfs, leading to the formation and subsequent collapse of...
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Dr Andrey Shkerin (University of Minnesota)09/05/2023, 15:00
Dark matter particles can form halos gravitationally bound to massive astrophysical objects. The Earth could have such a halo where depending on the particle mass, the halo either extends beyond the surface or is confined to the Earth's interior. We consider the possibility that if dark matter particles are coupled to neutrinos, then neutrino oscillations can be used to probe the Earth's dark...
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Hailin Xu09/05/2023, 15:15Dark Matter
We consider halo dark matter particles whose energy is boosted by colliding with the hot solar plasma. This “solar-reflected” dark matter (SRDM) halo component extends the sensitivity of terrestrial direct detection experiments to lower dark matter masses. In this study, we use a Monte-Carlo simulation to model the propagation and scattering of dark matter particles. We study the properties of...
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Mr Mehrdad Phoroutan-Mehr (University of California, Riverside (UCR))09/05/2023, 15:30Dark Matter
Our research focuses on studying the heating mechanism of neutron stars through the capture of inelastic dark matter. Due to the high density of neutron stars, infalling dark matter particles are accelerated to relativistic speeds. To analyze the scattering between ultra-relativistic targets in the neutron star and quasi-relativistic infalling dark matter, we employ relativistic kinematics....
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Narayani Tyagi (Queen's University)09/05/2023, 15:45Dark Matter
This study investigates the capture and thermalization of inelastic dark matter outside neutron stars. While the possibility of capture, thermalization and annihilation has been studied in some detail in the literature, this has assumed dark matter thermalizes to a trajectory lying inside neutron stars. I will show that some inelastic dark matter models imply thermalization timescales long...
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