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# Particle Physics

This series consists of talks in the areas of Particle Physics, High Energy Physics & Quantum Field Theory.

## Seminar Series Events/Videos

mai 2 2017 - 1:00pm
Room #: 400
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mai 16 2017 - 1:00pm
Room #: 400
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mai 23 2017 - 1:00pm
Room #: 400
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## Discovering New Physics in Scattering Angles at the LHC

Mardi avr 18, 2017
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Since the Higgs, the LHC has offered no discoveries despite a sweeping hunt for new resonances.

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## New Directions in Dark Matter Direct Detection

Mardi avr 04, 2017
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Sub-GeV dark matter is a theoretically motivated but largely unexplored paradigm of dark matter. In this talk, I will discuss recent work on the direct detection of sub-GeV dark matter through dark matter-electron scattering. I will present some motivated models that can be probed with these techniques as well as projections for current and near-term noble liquid, semiconductor, and scintillator experiments. Finally, I will discuss some new techniques that may allow us to more robustly discriminate between dark matter signatures and background.

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## Gamma-ray Constraints on Decaying Dark Matter and Implications for IceCube

Mardi mar 28, 2017
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Utilizing the Fermi measurement of the gamma-ray spectrum toward the Galactic Center, we derive some of the strongest constraints to date on the dark matter (DM) lifetime in the mass range from hundreds of MeV to above an EeV. Our profile-likelihood based analysis relies on 413 weeks of Fermi Pass 8 data from 200 MeV to 2 TeV, along with up-to-date models for diffuse gamma-ray emission within the Milky Way.

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## Bounding Milli-magnetic charged particles

Mardi mar 14, 2017
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Just like how milli-electric charged particles can exist, so can milli-magnetic charged particles.  We review simple ways of evading the standard quantization arguments and why there are no model independent constraints on magnetically charged particles, milli-charged or not.  We then provide the first ever model independent bounds coming from magnetar cooling arguments.

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## Relaxion from particle production

Mardi mar 07, 2017

Recently a new solution to the hierarchy problem was proposed which makes use of the cosmological evolution of a light scalar field, a scanner, instead of symmetry or anthropic arguments to select a small Higgs mass. In the original proposal this scanner field could be the QCD axion and thus such class of solution became known as relaxion’’.

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## Goldstone Boson Counting in the Presence of Space-Time Symmetry Breaking, Non-Derivative Couplings and non-Fermi Liquid Behavior

Mardi fév 14, 2017
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## Radioactive Iron Rain: Evidence of a Recent Nearby Supernova Explosion

Mardi fév 07, 2017
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A very close supernova explosion could have caused a mass extinction

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## Coulomb artifacts and matching in lattice NRQCD;

Vendredi fév 03, 2017
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## Cores in Dwarf Galaxies from Fermi Repulsion

Mardi jan 31, 2017
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Cold dark matter provides a remarkably good description of cosmology and astrophysics. However, observations connected with small scales might be in tension with this framework. In particular, structure formation simulations suggest that the density profiles of dwarf spheroidal galaxies should exhibit cusps, in contrast to observations.

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## Something New Under (and in) the Sun? Effective field theories for point sources and the Hydrogen atom

Mardi jan 10, 2017
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This talk applies effective field theory to the back-reaction of sources with finite size but infinite mass. The main tool for calculating back-reaction is a general relation between a source's effective action and the boundary conditions of `bulk’ fields in the near-source limit. As applied to the Maxwell (or Einstein) fields for point sources this boundary condition reproduces standard Gauss’ Law expressions, but the same arguments imply source-dependent boundary conditions for the Schrodinger (or Dirac) field of an orbiting particle.

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## RECENT PUBLIC LECTURE

### Amber Straughn: A New Era in Astronomy: NASA’s James Webb Space Telescope

Speaker: Amber Straughn