Conveners
DM VIII
- Bibhushan Shakya (CERN)
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Nirmal Raj (TRIUMF)26/05/2021, 14:00DM
New states that mix with the neutron, such as dark baryons and mirror neutrons, have been proposed to address dark matter, baryogenesis, the long-standing neutron lifetime anomaly, and the recent XENON1T excess. I show that such states are extensively constrained by measurements of neutron star (NS) temperatures. When Fermi-degenerate neutrons in the stellar core convert to these states via...
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Aniket Joglekar (LAPTh, CNRS)26/05/2021, 14:15DM
Dark matter can deposit energy in neutron stars and heat them to temperatures that could be detected by upcoming infrared telescopes like James Webb Space Telescope (JWST). These observations have a potential to complement and outperform terrestrial direct detection in a large range of dark matter masses. The difference is particulalrly striking for inelastic dark matter. Electrons are also...
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Zachary Johnson (University of Michigan, Ann Arbor)26/05/2021, 14:30DM
Macroscopic dark matter candidates are large composite objects which escape standard direct detection constraints. Macros with substantial elastic scattering cross sections off visible matter can catalyze a variety of fusion processes in stars. We consider the effects of this process on Red Giant branch stars. We find that macros can ignite the helium core of these stars prematurely. We place...
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Cosmin Ilie (Colgate University)26/05/2021, 14:45DM
The mere observation of the first stars (Pop III stars) in the universe can be used to place tight constraints on the strength of the interaction between dark matter and regular, baryonic matter. We apply this technique to a candidate Pop III stellar complex discovered with the HubbleSpace Telescope at z∼7 and find some of the deepest bounds to-date for both spin-dependent and...
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Javier Fernández Acevedo (Queen's University)26/05/2021, 15:00DM
Large composite states of dark fermions bound by a scalar provide a potential field under which Standard Model nuclei can accelerate to large kinetic energies, resulting in copious amounts of collisional radiation and, at the highest energies, thermonuclear fusion. In this talk, I discuss how this effect can cause white dwarfs to explode, as well as its detectability prospects at neutrino...
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Celeste Keith (University of Chicago)26/05/2021, 15:15DM
An excess of 511 keV photons has been detected from the central region of the Milky Way. It has been suggested that the positrons responsible for this signal might be produced through the Hawking evaporation of primordial black holes. After evaluating the constraints from INTEGRAL, COMPTEL, and Voyager 1, we find that black holes in mass range of ∼ (1 − 4) × 10^16 g could potentially produce...
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Tanmay Poddar (Physical Research Laboratory)26/05/2021, 15:30DM
Strong bounds from direct detection experiment put stringent limit on the dark matter mass which forces us to go beyond WIMP model of dark matter. In recent years the light mass dark matter particles gain lots of attention among the particle physicists. In this talk I will discuss about light gauge bosons motivated from U(1) extension of standard model and axions which can be a possible dark...
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Caleb Levy (Colgate)26/05/2021, 15:45DM
In recent years the usefulness of astrophysical objects as dark matter probes has become moreand more evident, especially in view of null results from direct detection and particle production experiments. The potentially observable signatures of dark matter gravitationally trapped inside a star, or another compact astrophysical object, have been used to forecast stringent constraints on the...
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