Graduate Open House: Astrophysics

March 27, 2020Session 1: 2-3pmSession 2: 3-4pm

Cosmology & Astrophysics @ Yale

Reina MaruyamaLaura Newburgh

Cosmology & Astrophysics @ Yale

Laura Newburgh

TelescopesKeck Telescopes Palomar 200-inch

SDSS

ChimeACT/Simons/CMB-S4

Mayall 4m

Hubble Space Telescope Chandra X-ray Observatory

Spitzer Space Telescope

Keck Telescopes

Telescopes

Yale Center for Research Computing

Big Data in Life ScienceGenomic Data

• HPC & Data Storage: Omega/Grace HPC clusters, GPU nodes

• Education & Training: Bootcamps on HPC, Python, Mathematica, Matlab, Parallel Computing

• Workshops: Day of Data, Hackathons

• External resources: XSEDE, BlueWaters, INCITE

Website: http://research.computing.yale.edu Email: research.computing@yale.edu

Daisuke NagaiAssociate Professor in Physics & Astronomy

Research Interests – Computational Cosmology & Astrophysics: Galaxy Clusters, Galaxy Formation & Evolution, Dark Energy, Dark Matter, Cosmological Simulations, Data Science

Computational Cosmology @ Yale

Exploring the Dark Side of the Universe

Yale Particle Physics GroupMarch 27, 2020

Charlie BaltayDavid Rabinowitz

Students

Research Program1. WFIRST Space Mission2. LaSilla-QUEST Supernova Survey3. DESI Large Scale Structure4. Chronopixel Pixel Detectors

Cosmology-the large Scale Structure of the Universe

Evolution of the Universe

• Big Bang Model-the universe is expanding a la Hubble’s Law

• Contrary to all laws of physics we know about, expansion is accelerating !!

• Hypothetical reason-Dark Energy with repulsive gravity

• What is this Dark Energy ?? about 75% of our Universe

Contents of the Universe

All we know in all of our Physics Books is a lousy few % of the Universe

How do we measure the Expansion Rate of the Universe as it was billions of years ago?

Measure Expansion Velocity using very distant Supernovas

The light reaching us now was emitted 3 billion years ago!!

The nature of that light, especially its redshift, tells us about the universe, i.e. its expansion velocity, as it was 3 billion years ago!!

lightEarth

Supernova

Takes light 3 Billionyears to get to Earth

3 x 1022 Kilometers

Space Based-Far away Supernova

Ground Based-Nearby Supernova

The Supernova Survey

The SDT report presented a notional SN program, as an existence proof.

It was intentionally not optimized, since there are many ways that one could use the SN capabilities of WFIRST for this dark energy measurement.

Space Mission designed to go far back in redshift to measure expansion history of the Universe and the parameters of Dark Energy using Supernova, BAO and Weak Lensing

The WFIRST Space Mission

D. Spergel1, N. Gehrels2C. Baltay3, D. Bennett4, J. Breckinridge5, M. Donahue6, A. Dressler7, B. S. Gaudi8, T. Greene9, O. Guyon10 C. Hirata8, J. Kalirai11 N. J. Kasdin1, B. Macintosh12, W. Moos13 S. Perlmutter14, M. Postman11, B. Rauscher2 J. Rhodes15, Y. Wang16, D. Weinberg8,

The La Silla/QUEST Supernova Survey

Full time use of the Schmidt Telescope at the Cerro La Silla Observatory in Chile

Uses the large area QUEST Camera designed and built at Yale

Chronopixels

Monolithic CMOS Pixel Detectorsfor ILC Vertex Detection

C. Baltay, W. Emmet, D. Rabinowitz,K. Baker, C. Weber

Yale University

Jim Brau, N. Sinev, D. StromUniversity of Oregon

3/19/05 14

Chronopixel Vertex Detectors

• High Precision Vertex detectors• for the High Energy e+e- • and Hadron Colliders

• CMOS Pixellated detectors that • record the time of each hit-• Backgrd due to multiple beam • crossings dissappear

• Developed design with SARNOFF• in collab w/Jim Brau’s group

• Tested three rounds of prototyping,• good performance

A single 25x25 micron pixel

Cosmology with Galaxy SurveysNaim and Xinyi at recent DESI observing runs

Luna colliding fuzzy dark matter halos

A simulation of how well DESI will measure the Ly-alpha P(k) (real data to follow soon)

Reconstructing the BAO feature

Cosmic Microwave Background Measurements 21cm Measurements of Dark EnergySimons Observatory: 4 new telescopes in Chile starting 2021

CMB-S4: 19 telescopes starting 2027CHIME telescope : DRAO, British Columbia,

Canada - On sky and taking data

(Sanah working with low

temperature thermometry)

(Drone test flight at Owens Valley Radio Observatory)

(Holographic measurements at

CHIME)

(Emily working on a testbed for noise characterization in

lab)

in flight!

I work on calibration — instrumentation and analysis

I lead ‘DAQ’ : all acquisition and control software, timing, live monitoring

(Drone test flight at Brookhaven National Lab)