Events Archive

Gravity Group Seminar, Steven Benton & Shuay-Pwu (Patty) Ho (Princeton University)
Fri, Dec 16, 2016, 12:00 pm1:30 pm

Steve Benton "Report on SuperBIT's 2016 Test Flight" ABSTRACT | SuperBIT is a wide-field sub-arcsecond imaging telescope for visible and near UV/IR wavelengths. It is designed to operate in the space-like environment of the Super-Pressure Balloon platform at an altitude of 35 km. During a 100 day flight it will infer masses of hundreds of…

Gravity Group Seminar, Mathew Madhavacheril (Princeton University)
Fri, Dec 9, 2016, 12:00 pm1:30 pm

TITLE Cosmology with the Longest Lever Arm using CMB Lensing ABSTRACT The cosmic microwave background (CMB) provides a snapshot of the universe at a redshift of around 1100. At the same time, it acts as a backlight that is gravitationally lensed by structure that formed at low redshifts. CMB fluctuations are therefore especially sensitive to…

Gravity Group Seminar, François Boulanger (Institut d'Astrophysique Spatiale, Orsay, France)
Fri, Dec 2, 2016, 12:00 pm1:30 pm

TITLE The interstellar B-fields crossing primordial CMB B-modes ABSTRACT Planck, as well as balloon and ground based experiments, have measured the polarization of the sky at sub-mm and mm wavelengths with unprecedented sensitivity. The data analysis involves research in cosmology and Galactic astrophysics, which might lead to a major…

Gravity Group Seminar, Stephan Schlamminger (NIST)
Fri, Nov 18, 2016, 12:00 pm1:30 pm

TITLE Measurements of the gravitational constant – why is a precise measurement so difficult? ABSTRACT In this presentation, I will summarize measurements of the Newtonian constant of gravitation, big G, that have been carried out in the last 30 years. I will describe key techniques that were used by researchers around the world to determine G…

Gravity Group Seminar, Anna Ijjas, Paul Steinhardt
Fri, Nov 11, 2016, 12:00 pm1:30 pm

TITLE Early-Universe Boot-camp Part III: The truth about bounces ABSTRACT This will be the third part of the early-universe boot-camp in which we will focus on cosmologies that replace a big bang with a big bounce. We will explain how, in these scenarios, the large-scale structure of the universe is determined during a contracting phase before…

Gravity Group Seminar, Jonathan Blackman (CIT)
Fri, Oct 28, 2016, 12:00 pm1:30 pm

TITLE Surrogate models of gravitational waveforms from numerical relativity simulations of black hole mergers ABSTRACT GW150914 was the first detection of gravitational waves from a binary black hole merger, bringing us into the era of gravitational wave astronomy. From such gravitational wave detections, we can put constraints on deviations…

Gravity Group Seminar, Ben Racine (University of Oslo) "B modes and component separation: the Gibbs sampling solution"
Fri, Oct 21, 2016, 12:00 pm1:30 pm

Detecting B-modes due to inflationary gravitational waves in the polarization of the Cosmic Microwave Background is one of the greatest goals of modern observational cosmology. Many experiments have been designed to detect this weak signal, and upper limits are improving year by year. In fact, while B-modes have now been clearly observed,…

Gravity Group Seminar, Paul Steinhardt "Early Universe Bootcamp"
Fri, Oct 14, 2016, 12:00 pm1:30 pm

These two meetings will be a frank examination of current theories of the origin and evolution of the large-scale structure of the universe, especially aimed at experimentalists and observers, with ample time for questions and discussion.

Gravity Group Seminar, "Early Universe Bootcamp"
Fri, Oct 7, 2016, 12:00 pm1:30 pm

These two meetings will be a frank examination of current theories of the origin and evolution of the large-scale structure of the universe, especially aimed at experimentalists and observers, with ample time for questions and discussion. The first meeting will focus primarily on big bang inflationary cosmology; the second will continue the…

Gravity Group Seminar, Mark Kamionkowski (JHU), "Dust polarization and interstellar turbulence"
Fri, Sep 30, 2016, 12:00 pm1:30 pm

Perhaps the most surprising result from the Planck satellite is the observation that the E-mode power in the dust polarization is twice that in the B mode, in stark contrast to pre-Planck expectations of roughly equal dust powers in E and B modes. I will show how the E- and B-mode powers are determined by fluctuations in the magnetized…

Gravity Group Seminar, Ira Thorpe (NASA/GSFC), "The success of LISA Pathfinder and the prospects for a space-based gravitational wave observatory"
Fri, Sep 23, 2016, 12:00 pm1:30 pm

Abstract: "A space-based gravitational wave observatory targeting the milliHertz frequency band has the potential to inform many areas of physics and astrophysics including the nature of gravity in the strong-field limit, the formation and growth of massive black holes and their host galaxies, and the demographics of stellar compact objects…

Gravity Group Seminar, Nick Battaglia (Princeton University), "Weak lensing mass calibration of SZ selected clusters from ACT"
Fri, Apr 22, 2016, 12:00 pm1:00 pm
Maria Salatino(Princeton University), "Cold-Electron Bolometers for playing with the CMB"
Meet at 11:30 am at long table in PCTS to meet with speaker. There will be a short talk by Maria Salatino, Princeton University. See web site for information on placing food order
Gravity Group Alessandra Buonanno, Max Planck Institute for Gravitational Physics
Fri, Apr 8, 2016, 12:30 pmFri, Mar 25, 2016, 1:30 pm
Note: Joint with the PCTS workshop GR@100++. Lunch will be provided in the PCTS Lounge, starting at Noon.

Gravity Group Seminar, Alessandra Buonanno (MPI for Gravitational Physics) "GW150914 and the next challenges..."
Fri, Apr 8, 2016, 12:30 pm1:30 pm

Title: GW150914 and the next challenges in gravitational-wave observations Joint event with the "GR@100++" PCTS workshop. Note special time! For Gravity Group members who attend the seminar talk, there is a free lunch with the workshop participants, starting at Noon. The talk is open for everybody. If you’d like to attend the entire workshop,…

Gravity Group Lunch Seminar, Kris Sigurdson (IAS) "Gravity as a window onto new particle interactions in the dark Universe"
Fri, Apr 1, 2016, 12:00 pm12:00 pm

Gravity's universal coupling to particles and fields makes it our most robust probe of Nature. In the past century it has alerted us to both dark matter and dark energy and our precision gravitational gaze may still have surprises in store. I will review the Einstein-Boltzmann equations of cosmological perturbation theory with an emphasis on…

Gravity Group Seminar, Chuck Bennett (Johns Hopkins University) "Cosmic Convergence?"
Fri, Mar 25, 2016, 12:00 pm1:00 pm

Do we have a Standard Model of Cosmology that explains all cosmological measurements with six well-specified parameter values? Having recently celebrated the 50th anniversary of the discovery of the CMB, I summarize what we have learned from the CMB (our most powerful cosmological tool) and from combining the CMB with other cosmological data…

Gravity Group Seminar, Jean-Loup Puget (Institut d’Astrophysique Spatiale, Orsay)
Fri, Mar 4, 2016, 3:00 pm4:00 pm

*Note the special time*