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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

mar 28 2017 - 1:00pm
Room #: 400
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avr 25 2017 - 1:00pm
Room #: 400
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mai 23 2017 - 1:00pm
Room #: 400
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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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## Fishing for new physics at the LHC

Mardi déc 06, 2016
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I will discuss ways to search for new physics with the LHC heavy ion program and the ATLAS/CMS high level trigger.

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## The String Soundscape at Gravitational Wave Detectors

Mardi nov 29, 2016

In this talk, we explore the possibility of gravitational wave production due to ultra-relativistic bubble wall collisions. This occurs due to a process of post-inflationary vacuum decay that takes place via quantum tunnelling within a warped throat (of Randall-Sundrum type). We emphasise the differences between vacuum decay via quantum tunnelling, and a thermal first order phase transition, and how potential gravitational wave signals from both processes differ.

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## (Directional) Detection of Dark Matter with Graphene

Mardi nov 22, 2016
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Two-dimensional materials such as graphene sheets can serve as excellent detectors for dark matter (DM) with couplings to electrons. The ionization energy of graphene is O(eV), making it sensitive to DM as light as an MeV, and the ejected electron may be detected without rescattering in the target, preserving directional information. I will describe the first experimental proposal for directional detection of MeV-GeV scale DM, which can be implemented in the PTOLEMY relic neutrino experiment and has comparable sensitivity to proposals using semiconductor targets.

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## RECENT PUBLIC LECTURE

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

Speaker: Amber Straughn