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November

| Event Location: TRIUMF Conference Room

The non-zero mass of neutrinos suppresses the growth of cosmic structure on small scales. Since the level of suppression depends on the sum of the masses of the three active neutrino species, the evolution of large-scale structure is a promising tool to constrain the total mass of neutrinos and possibly shed light on the mass hierarchy. I will discuss recent progress and future prospects to constrain the neutrino mass sum with cosmology.

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Add to Calendar 2018-11-19T13:00:00 2018-11-19T14:00:00 Cosmology with Massive Neutrinos The non-zero mass of neutrinos suppresses the growth of cosmic structure on small scales. Since the level of suppression depends on the sum of the masses of the three active neutrino species, the evolution of large-scale structure is a promising tool to constrain the total mass of neutrinos and possibly shed light on the mass hierarchy. I will discuss recent progress and future prospects to constrain the neutrino mass sum with cosmology. Event Location: TRIUMF Conference Room

November

| Event Location: Hennings 318

Please join us before the Colloquium in Hennings 318 for coffee, tea and snacks at 2:45 pm

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Add to Calendar 2018-11-19T15:00:00 2018-11-19T16:15:00 To be announced: speaker Megan Ansdell (Berkeley) Please join us before the Colloquium in Hennings 318 for coffee, tea and snacks at 2:45 pm Event Location: Hennings 318

November

| Event Location: Hennings 318

The advent of space-based telescopes that provide high-precision time-series photometry, such as CoRoT and Kepler/K2, have revealed a zoo of stellar variability on timescales from minutes to months. In this talk, I will focus on classes of objects whose light curves show distinctive "dips" that can tell us a surprising amount about planet formation, evolution, and death. These include disintegrating planets, young dipper systems, likely exocomets, and unlikely alien megastructures.

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Add to Calendar 2018-11-19T15:00:00 2018-11-19T16:00:00 Things that go "dip" in the night: from disintegrating planets to alien megastructures The advent of space-based telescopes that provide high-precision time-series photometry, such as CoRoT and Kepler/K2, have revealed a zoo of stellar variability on timescales from minutes to months. In this talk, I will focus on classes of objects whose light curves show distinctive "dips" that can tell us a surprising amount about planet formation, evolution, and death. These include disintegrating planets, young dipper systems, likely exocomets, and unlikely alien megastructures. Event Location: Hennings 318

November

| Event Location: BRIM 311

Topological insulators are electronic systems with an insulating bulk and topologically protected boundary states. Conventional 2D topological insulators induce 1D edge states. Recent studies indicate that lower-dimensional topological states are also possible in electronic systems through higher-order topology, which, however, has been confirmed only in Bismuth in experiments [1]. In this talk, I will show that lower-dimensional topological wave trapping can be achieved in photonic and acoustic systems through several different mechanisms.

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Add to Calendar 2018-11-22T14:00:00 2018-11-22T15:00:00 CM Seminar: TOPOLOGICAL CAVITY STATES IN TWO-DIMENSIONAL PHOTONIC/PHONONIC CHIPS Topological insulators are electronic systems with an insulating bulk and topologically protected boundary states. Conventional 2D topological insulators induce 1D edge states. Recent studies indicate that lower-dimensional topological states are also possible in electronic systems through higher-order topology, which, however, has been confirmed only in Bismuth in experiments [1]. In this talk, I will show that lower-dimensional topological wave trapping can be achieved in photonic and acoustic systems through several different mechanisms. Event Location: BRIM 311

November

| Event Location: Hennings 201

My research program is motivated by fascination with bird flight. My laboratory group uses a multi- disciplinary approach that includes biomechanics, physiology, and neuroscience to examine flight ability. Our current research is organized around two topics: 1) how birds morph their wings and what benefits this provides; and 2) how optic flow signals are encoded in the avian brain and used to guide their flight. As we gain understanding of flight mechanisms, we further endeavor to apply comparative approaches that provide deeper insight into avian ecology and evolution.

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Add to Calendar 2018-11-22T16:00:00 2018-11-22T17:00:00 Biomechanics and neural control of maneuvering flight My research program is motivated by fascination with bird flight. My laboratory group uses a multi- disciplinary approach that includes biomechanics, physiology, and neuroscience to examine flight ability. Our current research is organized around two topics: 1) how birds morph their wings and what benefits this provides; and 2) how optic flow signals are encoded in the avian brain and used to guide their flight. As we gain understanding of flight mechanisms, we further endeavor to apply comparative approaches that provide deeper insight into avian ecology and evolution. Event Location: Hennings 201

November

| Event Location: Hennings 318

Please join us for coffee, tea and snacks before the Colloquium in Hennings 318 at 2:45 pm

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Add to Calendar 2018-11-26T15:00:00 2018-11-26T16:15:00 To be announced Please join us for coffee, tea and snacks before the Colloquium in Hennings 318 at 2:45 pm Event Location: Hennings 318

November

| Event Location: Henn 318. 6224 Agricultural Rd.

We show that when the bare cosmological constant in the Einstein field equations takes large negative values, the average distance between any two nearby geodesics moving in the spacetime sourced by quantum fields vacuum would gradually increase at a slow accelerating rate due to the weak parametric resonance effect caused by the fluctuations of the quantum vacuum energy density.

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Add to Calendar 2018-11-28T13:00:00 2018-11-28T14:00:00 Extreme fine-tuning of the cosmological constant is not needed We show that when the bare cosmological constant in the Einstein field equations takes large negative values, the average distance between any two nearby geodesics moving in the spacetime sourced by quantum fields vacuum would gradually increase at a slow accelerating rate due to the weak parametric resonance effect caused by the fluctuations of the quantum vacuum energy density. Event Location: Henn 318. 6224 Agricultural Rd.

November

| Event Location: AMPL 311

In a recent paper, the MIT group led Pablo Jarillo-Herrero has found that doping twisted bi-layer graphene can generate strongly correlated insulating states and superconductivity at particular twist angles called magic angles.  

This problem has excited the condensed matter community because it establishes that graphene, normally viewed as a weakly  interacting system, is a new platform for strongly correlated physics.   

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Add to Calendar 2018-11-29T14:00:00 2018-11-12T15:00:00 Moiré is Different: Wigner Solidification at Magic Angles in Doped Twisted bi-layer Graphene In a recent paper, the MIT group led Pablo Jarillo-Herrero has found that doping twisted bi-layer graphene can generate strongly correlated insulating states and superconductivity at particular twist angles called magic angles.   This problem has excited the condensed matter community because it establishes that graphene, normally viewed as a weakly  interacting system, is a new platform for strongly correlated physics.    Event Location: AMPL 311

November

| Event Location: Hennings 201

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Add to Calendar 2018-11-29T16:00:00 2018-11-29T17:00:00 The Future of Cancer Medicine: Personal or Industrial? Event Location: Hennings 201

December

| Event Location: Hennings 318

Please join us for coffee, tea and snacks before the Colloquium in Hennings 318 at 2:45 pm

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Add to Calendar 2018-12-03T15:00:00 2018-12-03T16:15:00 To be announced Please join us for coffee, tea and snacks before the Colloquium in Hennings 318 at 2:45 pm Event Location: Hennings 318

December

| Event Location: Henn 318. 6224 Agricultural Rd.

TBA

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Add to Calendar 2018-12-05T13:00:00 2018-12-05T14:00:00 TBA TBA Event Location: Henn 318. 6224 Agricultural Rd.

December

| Event Location: Hennings 201

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Add to Calendar 2018-12-06T16:00:00 2018-12-06T17:00:00 The human voice, the erhu and the violin Event Location: Hennings 201