Download presentation

Presentation is loading. Please wait.

Published byDorothy Sleigh Modified over 2 years ago

1
A Quasar Based Search for Hypertorus Cosmology Dylan Menzies, Grant Mathews University of Notre Dame

2
General relativity says nothing about topology. Maybe 3D topology is not simply connected. Imposing a non-trivial topology can make a non-compact universe compact. In flat space 10 compact topologies are possible. Infinite non-zero compact constant-curvature topologies. Topological dimension scale? Cosmological 3D Topology

3
2-torus covering space globally homogenous The Hypertorus 3-torus fundamental domain

4
WMAP quadrupole and octopole Suppression and alignment Tegmark et al march 03 Hypertorus? Use to guide search (l,b) ~ (250°,60°) Hypertorus Evidence

5
Multipole Suppression

6
2D CMB methods –Multipole suppression, dT3 0.25 dSLS –Cornish circles, de Oliveira-Costa July 03, rules out T3 –Search for discrete modes could find dT3>1 dSLS eg Rocha 02 Weak bounds so far. Previous Results

7
3D quasar groups –Bounds weaker dT3 0.02 dSLS –Reliant on redshift –Dropout intolerant Previous Results

8
Locate axis without z Bidirectional –search up to dSLS Find direction pixels with high number of alignments. z-free test

9
Based on lambda =.7 +-.1, flat (WMAP) Exclude pair if | t1-t2 | >.5 billion yrs (reduces peculiar velocity error as well) Exclude if z1, z2, theta1, theta2 not well related. More Filters

10
d z-distance relation z

11
Pixel Track Illustration

12
Bin by calculated dT3, store max alignments and location of max in each bin. Repeat on several sets decorrelated by random z- redistribution. Use mean and deviation of the bins in these sets as null hypothesis. More Sensitivity

13
0.01 deg resolution, 20x30 deg search dT3 bin spacing = 0.002 dSLS 2nd peak suggests dT3 =.38 dSLS, axis = (273.7, 59.1) But decorrelated data not consistent. Results

14
Sensitive to dropout of below 0.01 over much of dT3 range Results

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google