Events this week

Monday, April 14

Theoretical Astrophysics Center Seminar
Location: UCB – B5 Hearst Field Annex, 12:10 p.m.
Speaker: Wladimir Lyra (JPL/Caltech)
Title: “Gas in Debris Disks: A New Way to Produce Patterns

4D Seminars
Location: UCB – 402 Old Le Conte, 2:30 p.m.
Speaker: Brian Henning (UCB/LBNL)
Title: “What Do Precision Higgs Measurements Buy Us?”

Physics Department Colloquium
Location: UCB – 1 Le Conte Hall, 4:15 p.m.
Speaker: Ali Yazdani (Princeton)
Title: “Visualizing Topological Quantum States: From Dirac Edge States to Majorana Zero Modes”

Tuesday, April 15

Berkeley Cosmology Seminars
Location: UCB – Hearst Field Annex B1, 1:10 p.m. (also videoconferenced to LBNL 50-5026)
Speaker: Shy Genel (Harvard-Smithsonian CfA)
“The Illustris Simulation: Novel Successes and Remaining Failures in Modelling Galaxy Formation”
Abstract: I will present first results from the Illustris simulation, which is a cosmological hydrodynamical simulation using 2*18203 resolution elements. The simulation follows thousands of massive galaxies down to z=0 inside a (100Mpc)3 volume, resolving < ~kpc scales. It is run using the Arepo code to model gravity and hydrodynamics, as well as cooling, stellar population evolution, and various feedback processes. I will discuss a broad range of observables at z= 0 ->5 that Illustris matches reasonably well (and not particularly tuned for), including galaxy masses, morphologies, and spatial distributions. I will also present points of failure that can guide us how to further improve our models.

String Seminar
Location: UCB – 402 Old Le Conte, 3:40 p.m.
Speaker: Eva Silverstein (Stanford/SLAC)
Title: “Gravity Waves and Large-Field Inflation in String Theory”

Physics Research Progress Meeting
Location: LBNL – 50A-5132, 4 p.m.
Speaker: Daniel McKinsey (Yale)
Title: “Direct Dark Matter Searches using Liquid Xenon: Latest Results from LUX and Prospects for LZ”
Abstract:  The LUX (Large Underground Xenon) experiment is designed for the direct detection of dark matter particles via their collisions with xenon nuclei. This two-phase xenon time-projection chamber, operating at the Sanford Underground Research Facility (Lead, South Dakota), was cooled and filled in February 2013. Results will be presented from the first dark matter search data set, taken during the period April to August 2013 and corresponding to 85.3 live-days of data with a fiducial mass of 118 kg. The experiment exhibited a sensitivity to spin-independent WIMP-nucleon elastic scattering with a minimum upper limit on the cross section of 7.6 x 10^-46 cm^2 at a WIMP mass of 33 GeV/c^2. The LUX results are inconsistent with the low-mass WIMP signal interpretations of data from several recent direct detection experiments. This talk will provide an overview of the LUX experiment, focusing in the recent science results. I will also describe the next-generation LZ detector, planned to have an active liquid xenon mass of 7000 kg.

Wednesday, April 16

Weekly BOSS lunch
Location: LBNL - 
Speakers: tba

Particle Theory Seminar
Location: LBNL – 50A-5132, 2:00 p.m.
Speaker:  Yuhsin Tsai (Davis)
Title: “Direct Detection with Dark Mediators”

String Group Meeting
Location: UCB – 402 Old LeConte, 3:40 p.m.
Speaker: Mina Aganagic (UCB))
Title: “Gauge/Vortex Duality and AGT”

Location: LBNL, INPA Room 50-5026, 3:30 p.m.
Speakers:  tba

290E Seminar
Location: LBNL – 50A-5132, 4:00 p.m.
Speaker: Tenzing Joshi (UCB)
Title: “A G/NARRLI Effort: Measuring the Ionization Yield of Low-energy Nuclear Recoils in Argon”

Thursday, April 17

Weekly Astronomy Lunch
Location: UCB, 210 Wheeler, 12:30 p.m.
Speakers:  • Selma de Mink: TBD
• Jon Mauerhan: TBD
• Jack Steiner: Accretion Lags in Black-Hole X-ray Binaries

Astronomy Colloquium
Location: UCB, 2 LeConte Hall, 4:00 p.m.
Speaker: Selma de Mink (Carnegie Observatories)
Title:  “Live Fast Die Young: The Evolution of Massive Stars towards their Death”
Abstract: Massive stars are rare and short-lived. Nevertheless, through their extreme brightness, strong outflows and powerful explosions, they heat and stir their surroundings, drive outflows on galactic scales, and are responsible for the main production heavy elements in the Universe.  For this reason, stellar models of massive stars are an essential ingredient for a wide variety of astrophysical problems.
I will discuss advances in the massive star community triggered by new large spectroscopic surveys, such as the Tarantula Survey, that allow us now to populate the Hertzsprung-Russel diagram with stars up to 300 solar masses. Furthermore, I will discuss new constraints on impact of stellar rotation and the importance of binarity.
The theoretical and observational developments in this field call for a critical reconsideration of our understanding of the role that massive stars play in the Universe as Cosmic Engines, i.e. through their chemical, mechanical and radiative feedback, as Cosmic Probes, i.e. as tracers of starformation nearby and at high redshift, and in the variety of Cosmic Transients they produce.

Physics Research Progress Meeting – no RPM today

Friday, April 18

INPA Seminar
Location: LBNL – INPA Common Room (50-5026), 12:00 p.m.
Speaker: Andrea Dotti (SLAC)
Title: “Gean4: A Toolkit for the Simulation of the Interaction of Radiation with Matter. Overview, Validation and Recent Developments”
Abstract: tba

SSL Colloquium
Location: SSL, Addition conference room, 3 p.m.
Speaker: James Steiner (Harvard-Smithsonian Center for Astrophysics)
Title: “Spin Measurements of Stellar-Mass Black Holes”

Upcoming Events

April  22 -  1:10 p.m. (Cosmology-BCCP)
Speaker:  Leonardo Senatore, Stanford
Location:  UCB, Hearst Field Annex, B1 (also videoconferenced to 50-5026)
Title:  tba
Abstract:  tba