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## Homework Statement

The metric is given by

https://dl.dropboxusercontent.com/u/86990331/metric12334.jpg [Broken]

H is constant; s is an affine parameter, and so r(0)=t(0)=0.

*Apologise in advance because I'm not very good with LaTex. So I used Word for equations, and upload handwritten attempt at solution*

## Homework Equations

Need to show that the null geodesics from r=0, t=0 are given by

https://dl.dropboxusercontent.com/u/86990331/metricquestion.jpg [Broken]

## The Attempt at a Solution

I get the required

**t**but the sign is different.

**https://dl.dropboxusercontent.com/u/86990331/metricattemptatsolution.jpg [Broken]**

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