Events Archive

Gravity Group Seminar

Gravity Group Lunch Seminar, David Spergel (CCA, NYC) "The Search for Dark Energy and NASA’s WFIRST mission"

Gravity Group Lunch Seminar, Cynthia Chiang (U. KwaZulu-Natal, SA), "Illuminating the Dark Universe with Radio Observations" Jadwin A10

Wed, Jan 31, 2018, 12:30 pm

Observations of redshifted 21-cm emission of neutral hydrogen are a rapidly growing area of cosmology research.  Measurements across a wide range of radio frequencies allow us to access redshifts that encompass a vast comoving volume, spanning both cosmic dawn and the formation of large-scale structure.  I will describe two new experiments,...


Gravity Group Lunch Seminar, Sherry Song and Yaqiong Li (Princeton University), Jadwin 102

Fri, Jan 26, 2018, 12:00 pm

Xue (Sherry) Song, Princeton University
"Journal Club Discussion of Watts et al. (2018) [CLASS Collaboration]"

The paper is available at .

Yaqiong Li, Princeton University

Gravity Group Lunch Seminar, Steve Choi (Princeton University) "Precision Cosmology with Advanced ACTPol" (102 Jadwin Hall)

Fri, Jan 19, 2018, 12:00 pm

The Advanced ACTPol upgrade on the Atacama Cosmology Telescope aims to improve the measurement of the cosmic microwave background anisotropies and polarization, using four new dichroic detector arrays fabricated on 150-mm silicon wafers.


Gravity Group Lunch Seminar, Kevin Crowley (Princeton University), "Transition-Edge Sensors for CMB Polarimetry"

Fri, Dec 15, 2017, 12:00 pm

Studies of the anisotropies in the Cosmic Microwave Background (CMB) are now focused on recovering primordial signals from polarization patterns on the sky. The demand for instruments with greater raw sensitivity is being met by scaling the density of telescope focal planes up to thousands, and tens of thousands, of detectors.

Gravity Group Lunch Seminar, Adrian Price-Whelan (Princeton University), "Improving Gaia parallaxes with data driven models, and other Gaia miscellany"

Fri, Oct 27, 2017, 12:00 pm

The Gaia mission will deliver astrometry for >1 billion stars in the Milky Way.For distant or faint sources -- i.e. most sources -- the astrometry alone willbe low signal-to-noise, so inferred distances or tangential velocities will be noisy.

Astroplasmas / Gravity Group Joint Seminar, Brian Metzger (Columbia University), "The Multi-Messenger Picture of a Neutron Star Merger"

Fri, Oct 20, 2017, 12:30 pm

On August 17 the LIGO/Virgo gravitational wave observatories detected the first binary neutron star merger event (GW170817), a discovery followed by the most ambitious electromagnetic (EM) follow-up campaign ever conducted.  A gamma-ray burst (GRB) of short duration and very low luminosity was discovered by the Fermi and INTEGRAL satellites...

Gravity Group Lunch Seminar, Heather McCarrick (Columbia University), "KIDs for CMB Polarimetry"

Fri, Oct 13, 2017, 12:00 pm

I will talk about the development of kinetic inductance detectors (KIDs) optimized for cosmic microwave background (CMB) polarization studies. We have designed, fabricated, and tested arrays of dual-polarization lumped-element KIDs (LEKIDs).

Gravity Group Lunch Seminar, Nick Jennings (University of Oxford), "Searches for ALPs with Current and Future X-ray Satellites"

Fri, Sep 29, 2017, 12:00 pm

Galaxy clusters represent excellent laboratories to search for Axion-Like Particles (ALPs). They contain magnetic fields which can induce quasi-sinusoidal oscillations in the X-ray spectra of AGNs situated in or behind them.

Gravity Group Lunch Seminar, Srini Raghunathan (University of Melbourne, AU), "Measuring masses of galaxy clusters using CMB-cluster lensing"

Fri, Sep 22, 2017, 12:00 pm

Galaxy clusters are the largest gravitationally bound objects in the Universe and are excellent cosmological probes. Their power as cosmological probes, however, is currently limited by the systematics involved in the measurement of their mass. In this talk, I will discuss the method to estimate their masses using the weak-gravitational lensing...

Gravity Group Seminar, Brenna Flaugher (Fermilab)

Fri, Jun 9, 2017, 12:00 pm

TITLE: The Dark Energy Survey 

Gravity Group Seminar, Neil Cornish (Montana Sate University)

Fri, Jun 2, 2017, 12:00 pm

“Gravitational Wave Astronomy - What’s next?”

Gravity Group Seminar, Benjamin A. Mazin (UCSB)

Fri, May 5, 2017, 12:00 pm

TITLE Microwave Kinetic Inductance Detectors for High Contrast Imaging

Gravity Group Seminar, Chiara Mingarelli (Max Planck)

Fri, Apr 28, 2017, 12:00 pm

Insights into Supermassive Black Hole Mergers, Stalling and Demographics with Pulsar Timing Arrays


Gravity Group Seminar, Cristobal Sifon (Princeton University) "Weak lensing masses of galaxies in galaxy clusters, from LRGs to UDGs"

Gravity Group Seminar, Kimmy Wu (UC Berkeley) Adam Anderson (Fermilab, University of Chicago)

Wed, Apr 12, 2017, 2:30 pm

Speaker 1: Kimmy Wu, UC Berkeley

"CMB Polarization B-mode Delensing with SPTpol and Herschel"

Gravity Group Seminar, Simon Foreman (CITA)

Fri, Apr 7, 2017, 12:00 pm

Cosmic shear as a probe of galaxy formation physics


Gravity Group Seminar, Will Coulton (Princeton University) "Cosmology and astrophysics from the bispectrum"

Fri, Mar 31, 2017, 12:00 pm

Cosmology and astrophysics from the bispectrum


Gravity Group Seminar, Jon Gudmundsson (NORDITA & Stockholm University, Sweden)

Fri, Mar 17, 2017, 12:00 pm

The planets in our solar system provide a valuable calibration source for experiments designed to probe the cosmic microwave background (CMB). 

Gravity Group Lunch Seminar, Ed Young | Justin Ripley, (Princeton University)

Fri, Mar 10, 2017, 12:00 pm

We will have two half-hour talks (in the order below) instead of the "usual" one-hour presentation.

SPEAKER:  Ed Young (Princeton University) "Deprojection: Application to the SPIDER data"
In this talk, I'll introduce the basics of deprojection, then discuss its implementation in the SPIDER analysis...