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UM REU Research

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Vanessa Logan

on 17 September 2013

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Transcript of UM REU Research

Our Universe as a Network
What is Network Theory?
How can we relate this to our universe?
There are about one hundred billion galaxies in the universe

Galaxy clusters are a way of describing a group of hundreds to thousands of galaxies

Galaxies are nodes, edges are the connections between two galaxies and each edge has a weight.
Galaxies as a Network
Data used is from a mock large scale sky survey.



Luminosity and distance from one galaxy to another is known,
but the redshift is needed.

We can use redshift, luminosity and the angular distance,

Dark Matter and our Network
Our knowledge of networks can help us understand dark matter structure in galaxies

Galaxies make up a small percentage of matter in the universe

Gravitational lensing shows us the additional mass around a galaxy and therefore the galaxy halo around a galaxy cluster

Groups of galaxies in a network can show where a dark matter halo is, since we can't see the dark matter!

Conclusions
We can use network theory to give us a better understanding of the universe, the way we interpret its structure and how it is created and evolves over time.
A visual and mathematical way to represent the relationship between large amounts of data

Simply, a collection of nodes and edges
Thanks!
Tim McKay- PI
Adam Sypniewski- Graduate Student

University of Michigan Dark Energy Survey Team

REU Directors:
Myron Campbell
Jim Liu

The University of Michigan
The National Science Foundation
Challenges in Calculating Weights
High weight objects are vital to the structure of a network

Goal:
Objects of the same brightness and close together on the sky

Problems:
Small redshift bins creating high weight calculations because of high luminosity objects

3D distance between objects were not emphasized enough
Questions?
angular separation
angular separation
Version 1
Final Version
Final Version
Initial Version
True Z Difference
True Z Difference
20% with lowest z difference
12% with lowest z difference
High School
College
REU
Camp Students
Family
Vanessa Logan
The University of Michigan
Physics REU 2013
Ann Arbor, MI

REU? RE... what?
Research Experience for Undergraduates (REU) funded by the National Science Foundation (NSF) in a variety of sciences subjects.
Search for online, NSF website, posters
Eligible for US Citizens only
REUs are great opportunities to:
Decide if you want to go to graduate school
Do different and exciting research
Have an experience at a different (big!) school
Explore a new area and city
Network (students, graduate students, professors)
Learn the value of a liberal arts education!
REU Application Advice
Don't get discouraged if you don't get into a REU!
Large pool of applicants for a small amount of positions
Every REU is looking for something different
Emphasize your liberal arts education- writing, research, people skills
Apply over Winter Break to a variety of programs
REU, NASA, Observatories, private companies, etc.
Work with APEX to create a professional and science emphasized resume
Create a spreadsheet of deadlines for letters of recommendation writers
Use the same basic cover letter for each and modify for each application
Make a LinkedIn!
Professional network for all careers
Online resume with more details, skills, endorsements
A week before I was accepted, several UMich professors viewed my profile

UM Physics REU
12 students from different colleges
Worked with a professor and graduate student
40 hours a week
Each week my REU had two lunch sessions and field trips
Trip to Fermilab and Chicago!
Stayed in dorms on campus
The most important part- explored Ann Arbor!
Adviser: Tim McKay
Full transcript