# Accelerating Universe pre-1997

1. Mar 31, 2007

### AngryJeans

I'm a physics grad student attempting to do a research paper on the social implications of the accelerating universe. To do this, I'm trying to find information on theories for and against the accelerating universe from before the supernova observations by the Perlmutter and Riess teams (which I believe happened in 1997).

Can anyone tell me about the early theories? or direct me to where I can find information on them?

Thank you

2. Mar 31, 2007

### marcus

Steven Weinberg "prediction" of positive Lambda needs to be deflated.
An astronomer at Harvard Observatory named Loeb has shown that Weinberg "anthropic" prediction doesnt actually work---if you follow the reasoning it can predict a Lambda that is an order of magnitude larger than what Weinberg said. It was probably just a lucky guess. I don't know the details because not interested in anthropic stuff---but would be skeptical.
You can find Loeb's paper just by plugging Loeb into the arxiv search engine. or Abraham Loeb

Early theories? what about Willem De Sitter in 1917?

Two years after Einstein comes out with Gen Rel in 1915, De Sitter finds a solution with positive Lambda-----accelerating expansion.

it is the empty or blank universe with positive Lambda, just like
Minkowskispace is the flat unexpanding empty blank universe.

So De Sitter space is a kind of paradigm-----the vanilla version not only of expanding universe but of accelerating expanding
============

there is plenty more.

In the early 1990s Rafael Sorkin a quantum gravitist predicted positive Lambda

I have tried to understand how he arrived at it and I read his paper

"Forks in the Road to Quantum Gravity"
http://www.citebase.org/abstract?id=oai:arXiv.org:gr-qc/9706002 [Broken]

this describes the earlier (circa 1992 IIRC) prediction and gives source where it is on the record

but can't say I follow his reasoning
=============
I'm sure other folks can come up with plenty more.

But for starters here is something on De Sitter and De Sitter space
http://en.wikipedia.org/wiki/Willem_de_Sitter
http://en.wikipedia.org/wiki/De_Sitter_universe
http://en.wikipedia.org/wiki/De_Sitter_space

Last edited by a moderator: May 2, 2017
3. Mar 31, 2007

### Wallace

I can't think of the name right now but I will try and search around but there was a cosmologist in the 70's that wrote a bunch of papers including a Nature letter about a Lambda universe. They predicted it based on chemical evolution data but it was generally thought that not enough was known about the modeling of the evolution to believe the prediction.

I will try and chase the reference down...

Edit: I found it, it was Beatrice Tinsley that was plugging this idea in the late 70's.http://www.nature.com/nature/journa...;jsessionid=FA994C36ABBF80657BA78438C627556C" is a link to the nature article.

Last edited by a moderator: Apr 22, 2017
4. Apr 2, 2007

### AngryJeans

Thank you. This is just the sort of information I need. Beatrice Tinsley looks like she would make a great study. Do you happen to know who her major opponents were?
Kim

5. Apr 2, 2007

### marcus

It's neat that Wallace knew of something that was just the ticket.
Just for the sake of my own curiosity, I find the topic social implications of accelerating expansion to be a fascinating and unexpected one

so I would like to hear a little more---if you would be willing to show your hand a bit.

What sorts of social implications could there be?

6. Apr 2, 2007

### Wallace

Unfortunately I don't know many of the details about Tinsley or her opponents. I only heard about her and her work a month or two ago when someone mentioned it as a curious aside in a talk I saw.

As far as I know people just didn't trust the modeling that the method used required since there was no way to verify the implications by some other measure. I think the reason the accelerating universe is more accepted now is that it is seen in multiple independent data sets, although the SN results are probably the keys set of observations.

I studied a fair bit of the history, philosophy and sociology of science back in my undergrad days. Like marcus I would be interested in some more details of your study.

7. Apr 2, 2007

### cosmopot

Unexpected stuff

Big Bang did not and never expect an accelerating expansion while the model of flat and infinite universe (astro-ph/0605213) must have the accelerating expansion.

8. Apr 5, 2007

### AngryJeans

This is for an STS (Science and Technology Studies) class called History of Science. It's all done from a very social/humanities perspective.

Social Implications might no longer be the best term. While looking at Tinsley, I found that she staunchly supported the accelerating universe idea while others waffled. Right now, I think that hunting some social influence that allowed her to believe so firmly in the idea is my best bet.

(The Einstein/De Sitter debates also look very interesting but I think they have been studied. Tinsley's work look unexplored and it's recent enough to find most of it.)

9. Apr 7, 2007

### Chronos

Perhaps this will be useful:
http://www.shpltd.co.uk/eisberg-tinsley.pdf [Broken]

Last edited by a moderator: May 2, 2017
10. Apr 7, 2007

### Garth

Thank you Chronos, that was an interesting and moving read.

Tinsley's Nature paper argued for a $\Lambda$, accelerating, universe based on the value of Hubble's constant, "of the order of 100 km s-1 Mpc-1" and the age of Globular clusters "of the order of 16,000 Myr".

It is interesting to speculate that now DE and acceleration are firmly part of the standard model the present age of the universe at 13.8 Gyrs is still short of Tinsley's age of the globular clusters, but their present estimated age is younger. I wonder if she had that new age to work with, and hence also possible adjustment to both that age and H0, whether her case for $\Lambda$ would have been so strong?

We might also note that back in 1978 a value for H0 often used was midway between 50 and 100 km s-1 Mpc-1 i.e. 70 km s-1 Mpc-1, (e.g. see Weinberg), almost the present value.

Garth

Last edited: Apr 7, 2007