Register

Adv. Query

Q&A (4831)

Reviews (201)

Open problems (45)
Meta (437)

Site Statistics

205 submissions , 163 unreviewed
5,054 questions , 2,207 unanswered
5,345 answers , 22,720 comments
1,470 users with positive rep
818 active unimported users
More ...

How to find solution of Friedman equation numerically ?

415 views

I am trying to solve friedman acceleration equation and continuity equation numerically using Runge Kutta Dormand Prince Method . My code was doing excellent for solving coupled differential equations. But, when I am trying to solve this equation , I am getting wrong results , I am getting same variation of scale factor for both matter dominated and radiation dominated case while one should vary as a^2/3 and other should vary as a^1/2. Can someone please tell me the possible reasons why this is happen ?

\[\Ddota= -1/6(\rho + 3p)\]

Closed by author request

asked Aug 6, 2021 in Closed Questions by Doribez (5 points) [ no revision ]
recategorized Aug 16, 2021 by Dilaton

Your comment on this question:

To answer, leave an answer instead. Comments are usually for non-answers.
To mask links under text, please type your text, highlight it, and click the "link" button. You can then enter your link URL.
To alert a user, please use the "@" command and remove spaces from the username, example, the user "John Doe" should be pinged as "@JohnDoe", while the user "Johndoe" should be pinged as "@Johndoe". The post author is always automatically pinged (unless you are the post author).
Please consult the FAQ for as to how to format your post.

Live preview (may slow down editor) Preview

Your name to display (optional):

Email me at this address if a comment is added after mine:

Privacy: Your email address will only be used for sending these notifications.

Anti-spam verification:

If you are a human please identify the position of the character covered by the symbol $\varnothing$ in the following word:
p$\hbar$y$\varnothing$icsOverflow
Then drag the red bullet below over the corresponding character of our banner. When you drop it there, the bullet changes to green (on slow internet connections after a few seconds).

Please complete the anti-spam verification

user contributions licensed under cc by-sa 3.0 with attribution required

...