According to cosmological models based on classical general relativity, the universe started in a singular state nearly 14 billion years ago. In classical general relativity time cannot be extended before the singularity and so there was no time before the big bang. 719 more words

## Tags » General Relativity

#### Emergent space using Rasch pairs analysis/ adaptive comparative judgment

PSEUDO-RANDOM DATA TESTING THE SCALES USED IN RASCH PAIRS ANALYSIS/ ADAPTIVE COMPARATIVE JUDGEMENT

ABSTRACT

Pseudo-random data are used to illustrate the relationship between errors in raw data being comparatively judged and the resulting Rasch pairs location parameters, first for data which are relatively homogeneous and second for data which have various amounts of heterogeneity. 1,001 more words

#### Seminar on Mathematical General Relativity - Wednesday Sept. 17, 2014

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## Seminar on

**Mathematical General Relativity**

*Organizers:*

*Philippe G. LeFloch*

*(Paris)*

*Jérémie Szeftel (Paris)*

*Ghani Zeghib (Lyon)*

**ANR Project 263 more words**

#### Semiclassical states in quantum gravity: Curvature associated to a Voronoi graph by Daz-Polo and Garay

This week I’ returning to a much more fundamental level and reviewing a paper on Voronoi graphs. These are a method of dividing up a space into triangles and my very early work on this blog was looking at random triangulations. 1,547 more words

#### General Relativity and Gravitational Lensing: Part 2 - Dark Matter

Previously we discussed Arthur Eddington and his expedition to measure the gravitational lensing effects of the Sun during a solar eclipse. The results were in agreement with Einstein’s predictions from General Relativity, which catapulted Einstein into the public eye and established General Relativity as the fundamental explanation of gravity in terms of the curvature of space and time. 2,328 more words

#### Planets, Stars and Blackholes

**Planets, Stars**

Exterior Schwarzschild Solution

(8*4*((x^2+y^2)^0.5-2*4))^0.5, x is from -20 to 20, y is from -20 to 20, z is from -0 to 50

Interior Schwarzschild Solution… 89 more words

#### Wormholes

**Morris Thorne Wormhole (Traversable)**

Blackhole: (2*ln((x^2+y^2)/2+(((x^2+y^2)/2)^2-1)^0.5)

Whitehole: -(2*ln((x^2+y^2)/2+(((x^2+y^2)/2)^2-1)^0.5))

with rs= (x^2+y^2)^0.5 , b= 2 (thickness of the throat)**Schwarzschild Wormhole (Non-Traversable)**Blackhole: (8*2*((x^2+y^2)^0.5-2*2))^0.5

Whitehole: -(8*2*((x^2+y^2)^0.5-2*2))^0.5… 53 more words