We will kick off this season with a "Meet the Gravity Group" event. The format will be the same as last year's: all of us, be we juniors getting started on our Fall papers or emeritus, will get one slide and one minute to introduce ourselves to our new colleagues and share our spring / summer updates with the group.

# Events Archive

## Gravity Group Seminar

### Gravity Group Seminar | Meet the Gravity Group

### Gravity Group Lunch Seminar, Daniel Dutcher | U. Chicago “Measuring the Polarization of the CMB with SPT-3G”

Observations of the cosmic microwave background form the pillar of our current understanding of cosmology. Measurements of the temperature and polarization anisotropies of the CMB extending to small angular scales set tight constraints on cosmological parameters, probing both the standard LCDM model and the physics of inflation.

### Gravity Group Lunch Seminar, Justin Ripley & Joseph van der List | Princeton

**Justin Ripley, Princeton University** "Modeling the 'ringdown' of a Kerr black hole"

### Gravity Group Lunch Seminar, Zack Li & Rita Sonka | Princeton

**Zack Li, Princeton University**

"ABS, ACT, and Planck via the Simons Observatory Power Spectrum Pipeline"

### Gravity Group Lunch Seminar, Ivan Padilla | JHU "Cosmology Large Angular Scale Surveyor: Circular polarization at 40 GHz"

Large angular scale polarimetry of the CMB will provide powerful constraints on the cosmological parameters r, the tensor-to-scalar ratio, and tau, the optical depth to the epoch of reionization.

### Gravity Initiative Lunch, Antonios Tsokaros | University of Illinois "Numerical methods in general relativity and the physics of compact objects"

Every astrophysically realistic simulation needs accurate initial data and in this talk I will present methods to obtain such solutions for a variety of problems. In particular I will focus on a new initial data formulation to solve the full set of Einstein equations for spacetimes that contain a black hole under general conditions.

### Gravity Group Lunch Seminar, Oliver Philcox | Princeton University "Detection and Removal of Dust Foregrounds in the B-mode CMB via Statistical Anisotropy"

Searches for inflationary gravitational wave signals in the CMB B-mode polarization are expected to reach unprecedented power over the next decade. A major difficulty in these ongoing searches is that Galactic foregrounds such as dust can easily mimic inflationary signals.

### Gravity Group Lunch Seminar, Andrew Chael | PCTS "The black hole-jet connection in M87: linking simulations to VLBI images"

The Event Horizon Telescope (EHT) has produced the first image of the 1.3 mm-wavelength emission around the black hole "shadow" at the heart of M87.

### Gravity Group Lunch Seminar, Corwin Shiu | Princeton "A design of a wideband 30/40 GHz diplexed camera suitable for BICEP Array"

**Abstract:** Accurate understanding of astrophysical foregrounds is crucial in recovering the underlying CMB signal. In this talk I will discuss the design and performance of a camera that will be powerful at characterizing synchrotron emissions. The camera is comprised of slotted bowtie antenna elements coherently summed in a...

### Gravity Group Seminar | October 04, 2019

### Gravity Group Seminar, Charles Romero | UPenn "High resolution SZ observations of galaxy clusters"

Abstract:

### Gravity Group Seminar, Simons Observatory | Instrument Overview

Details to come...

Sign up for lunch https://forms.gle/axLZUeV7SF4muNpn8.

### Joint Thunch / Gravity Group Seminar, Kris Pardo | Princeton "Implications for the Stochastic Gravitational Wave Background from a Massive Quasar-binary"

**Implications for the Stochastic Gravitational Wave Background from a Massive Quasar-binary** The collective inspirals of very close-separation supermassive black holes (SMBHs) are expected to produce a stochastic gravitational wave background (GWB) at nHz frequencies, which is accessible to pulsar timing arrays.

### Gravity Group Lunch Seminar, Colin Hill | IAS/CCA "Extragalactic Foreground Biases in Primordial non-Gaussianity Measurements from the CMB"

Abstract: The cosmic microwave background (CMB) temperature bispectrum is currently the most precise tool for constraining non-Gaussianity (NG) in the primordial curvature perturbations. The Planck temperature data tightly constrain the amplitude of local-type NG, as could be generated in (e.g.) multi-field inflation: f_NL^loc = 2.5 +/- 5.7. ...

### Gravity Group Lunch Seminar, Xue (Sherry) Song and Joseph van der List | Princeton

**Xue (Sherry) Song** and **Joseph van der List** will lead our first journal club discussion of the academic year.

### Gravity Group Lunch Seminar, Max Abitbol | Oxford "Foregrounds of CMB B-modes and spectral distortions"

I will discuss topics related to foregrounds of two different CMB science cases. For the first part, I will introduce an expansion to foreground SED parameterizations in terms of moments of the parameter distributions.

### Gravity Group Lunch Seminar, Jo Dunkley | Princeton "Science forecasts for the Simons Observatory"

The Simons Observatory (SO) is a new CMB experiment being built in the Atacama Desert in Chile (with many contributions from Princeton) due to begin observations in the early 2020s.

### Gravity Group Lunch Seminar, Steve Benton | Princeton "Spider, SuperBIT, Taurus, and Cosmology from the Stratosphere"

As cosmological measurements increase in precision, foregrounds are increasingly problematic. One foreground that's possible to reduce is Earth's atmosphere. I will talk about experiments that use stratospheric balloons to achieve higher sensitivity and lower systematic errors than are possible on the ground, and at much lower cost than in...

### Gravity Group Lunch Seminar, Susan Clark | IAS "The magnetic interstellar medium and the polarized dust foreground"

The interstellar medium (ISM) is multi-phase, turbulent, and magnetic. This makes the ISM an ideal laboratory for studying the multi-scale physics of star formation and galactic evolution.

### Gravity Group Lunch Seminar, Jean-Loup Puget, IAS (Orsay) and ENS (Paris) "Planck 2018"

The Planck collaboration is in the process of delivering the "Planck results 2018" papers and data. The improvement of the map making will be described together with a new set of maps with some improvements for polarization at large scales.