A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » SpaceBanter.com forum » Search Forums
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

Showing results 1 to 25 of 212
Search took 1.18 seconds.
Search: Posts made by: Nicolaas Vroom
Forum: Research July 12th 18, 09:01 PM Posted to sci.astro.research
Replies: 8
Views: 524
Posted By Nicolaas Vroom
Missing matter found in the cosmic web

The article "Missing matter found in the cosmic web" in Nature of 21
June 2018 (See https://www.nature.com/articles/d41586-018-05432-2)
Starts with the following sentence: "We live in a dark...
Forum: Research April 7th 18, 10:15 PM Posted to sci.astro.research
Replies: 13
Views: 599
Posted By Nicolaas Vroom
NGC1052-DF2 Diffuse Galaxy without dark matter

On Friday, 30 March 2018 23:46:51 UTC+2, Martin Brown wrote:

What do people think of the recent claim in Nature that one of the new
wide field instruments has found a candidate diffuse...
Forum: Research November 11th 17, 09:48 PM Posted to sci.astro.research
Replies: 33
Views: 703
Posted By Nicolaas Vroom
Dark matter is:

On Tuesday, 7 November 2017 00:19:18 UTC+1, Phillip Helbig wrote:

You don't need a simulation. There is acceleration if

Omega/2 - lambda 0.

Which are the present values for Omega...
Forum: Research November 6th 17, 08:47 AM Posted to sci.astro.research
Replies: 33
Views: 703
Posted By Nicolaas Vroom
Dark matter is:

On Friday, 3 November 2017 20:08:37 UTC+1, Phillip Helbig wrote:
In article ,
Nicolaas Vroom writes:

I...
Forum: Research November 3rd 17, 03:56 AM Posted to sci.astro.research
Replies: 33
Views: 703
Posted By Nicolaas Vroom
Dark matter is:

On Thursday, 2 November 2017 03:39:27 UTC+1, Phillip Helbig wrote:

We know that the universe is approximately flat. Assuming a simple
topology, that means that it is either infinite or very...
Forum: Research October 29th 17, 06:51 PM Posted to sci.astro.research
Replies: 33
Views: 703
Posted By Nicolaas Vroom
Dark matter is:

On Saturday, 28 October 2017 06:24:42 UTC+2, Phillip Helbig wrote:
In article ,
Nicolaas Vroom writes:

...
Forum: Research October 27th 17, 03:42 AM Posted to sci.astro.research
Replies: 33
Views: 703
Posted By Nicolaas Vroom
Dark matter is:

On Wednesday, 25 October 2017 23:34:51 UTC+2, Richard D. Saam wrote:
On 10/25/17 1:06 AM, Phillip Helbig (undress to reply) wrote:

"Dark matter" that we just doesn't seem able to see...
Forum: Research October 26th 17, 08:35 AM Posted to sci.astro.research
Replies: 2
Views: 242
Posted By Nicolaas Vroom
WIMPs

On Friday, 20 October 2017 06:50:35 UTC+2, Steve Willner wrote:
There have been many discussions here about WIMPs and searches for
them. Today's CfA Colloquium given by Dan Hooper of Fermilab...
Forum: Research October 24th 17, 09:25 PM Posted to sci.astro.research
Replies: 1
Views: 174
Posted By Nicolaas Vroom
Ratio baryonic versus non-baryonic matter in the Universe.

The article:
https://www.newscientist.com/article/2149742-half-the-universes-missing-matter-has-just-been-finally-found/
claims that:
"Half the universe's missing matter has just been finally...
Forum: Research June 30th 17, 06:56 AM Posted to sci.astro.research
Replies: 30
Views: 1,097
Posted By Nicolaas Vroom
entropy and gravitation

On Sunday, 11 June 2017 21:46:50 UTC+2, Gerry Quinn wrote:

I would imagine that there has been a lot of work done in this area in
conjunction with studies of dark matter. Obviously the...
Forum: Astronomy Misc November 26th 16, 01:29 PM Posted to sci.astro
Replies: 36
Views: 1,774
Posted By Nicolaas Vroom
Link between dark matter and baryonic matter

On Friday, 25 November 2016 23:37:50 UTC+1, Steve Willner wrote:

3. T&W use "mass" inconsistently. Sometimes they mean "relativistic
mass," E/c^2, and sometimes "rest mass." Modern...
Forum: Astronomy Misc October 28th 16, 09:35 AM Posted to sci.astro
Replies: 36
Views: 1,774
Posted By Nicolaas Vroom
Link between dark matter and baryonic matter

On Wednesday, 19 October 2016 21:06:01 UTC+2, Steve Willner wrote:
In article ,
Yousuf Khan writes:
We're still...
Forum: Research September 24th 16, 09:22 PM Posted to sci.astro.research
Replies: 3
Views: 397
Posted By Nicolaas Vroom
simple MOND question

On Sunday, 28 August 2016 20:06:48 UTC+2, Phillip Helbig wrote:

For my own thoughts about MOND read this:
http://users.telenet.be/nicvroom/mond.htm

OK, answering my own question here. F_N is the...
Forum: Astronomy Misc June 6th 16, 01:28 PM Posted to sci.astro
Replies: 3
Views: 644
Posted By Nicolaas Vroom
What would happen to time perception is we were exactly still?

Op vrijdag 3 juni 2016 15:52:03 UTC+2 schreef Muerte:

I was having a conversation with my son (13) last night about time
being perceived as slowing as the speed you travelled increased.
He...
Forum: Research April 21st 16, 10:35 PM Posted to sci.astro.research
Replies: 15
Views: 1,211
Posted By Nicolaas Vroom
Paradox unexplained

Op zaterdag 16 april 2016 08:38:51 UTC+2 schreef Steven Carlip:
First, in classical general relativity the
horizon is empty space -- there's nothing material there.
Second, for a large black...
Forum: Research April 20th 16, 04:26 AM Posted to sci.astro.research
Replies: 9
Views: 686
Posted By Nicolaas Vroom
Ligo. What happened 1.3 billion years ago.

Op donderdag 10 maart 2016 09:33:32 UTC+1 schreef Nicolaas Vroom:
Op zaterdag 5 maart 2016 10:32:33 UTC+1 schreef Jonathan Thornburg:
Nicolaas Vroom wrote:
...
Forum: Research April 19th 16, 04:10 PM Posted to sci.astro.research
Replies: 15
Views: 1,211
Posted By Nicolaas Vroom
Paradox unexplained

Op vrijdag 8 april 2016 10:01:20 UTC+2 schreef Steven Carlip:
On 4/7/16 4:13 AM, Nicolaas Vroom wrote:
Op zondag 3 april 2016 23:33:21 UTC+2 schreef Steven Carlip:

We believe that...
Forum: Research April 10th 16, 04:47 PM Posted to sci.astro.research
Replies: 15
Views: 1,211
Posted By Nicolaas Vroom
Paradox unexplained

Op vrijdag 8 april 2016 23:21:25 UTC+2 schreef jacobnavia:
Le 01/04/2016 16:47, Jos Bergervoet a écrit :

So why do people feel there is a paradox?!


A very good introductory article...
Forum: Research April 7th 16, 12:13 PM Posted to sci.astro.research
Replies: 15
Views: 1,211
Posted By Nicolaas Vroom
Paradox unexplained

Op zondag 3 april 2016 23:33:21 UTC+2 schreef Steven Carlip:

We believe that matter in a pure quantum state can collapse
to form a black hole.
This is in a certain sense equivalent that a star...
Forum: Research April 3rd 16, 09:15 AM Posted to sci.astro.research
Replies: 15
Views: 1,211
Posted By Nicolaas Vroom
Paradox unexplained

Op vrijdag 1 april 2016 16:49:07 UTC+2 schreef Jos Bergervoet:
For the black hole information paradox I would expect
two seemingly conflicting results (as is necessary for
a paradox by...
Forum: Research March 30th 16, 10:30 PM Posted to sci.astro.research
Replies: 16
Views: 1,033
Posted By Nicolaas Vroom
Did LIGO Detect Dark Matter? - New paper on arxiv.org

Op zaterdag 26 maart 2016 20:57:35 UTC+1 schreef Phillip Helbig:
In article , Nicolaas Vroom
writes:

I fully agree....
Forum: Research March 26th 16, 08:16 PM Posted to sci.astro.research
Replies: 16
Views: 1,033
Posted By Nicolaas Vroom
Did LIGO Detect Dark Matter? - New paper on arxiv.org

Op zondag 13 maart 2016 13:42:22 UTC+1 schreef Phillip Helbig (undress to reply):
In article , Nicolaas Vroom
writes:

...
Forum: Research March 13th 16, 10:15 AM Posted to sci.astro.research
Replies: 16
Views: 1,033
Posted By Nicolaas Vroom
Did LIGO Detect Dark Matter? - New paper on arxiv.org

Op donderdag 3 maart 2016 08:46:37 UTC+1 schreef Robert L. Oldershaw:

http://arxiv.org/abs/1603.00464

Title: Did LIGO detect dark matter?


The interesting part about the article is that...
Forum: Research March 10th 16, 09:33 AM Posted to sci.astro.research
Replies: 9
Views: 686
Posted By Nicolaas Vroom
Ligo. What happened 1.3 billion years ago.

Op zaterdag 5 maart 2016 10:32:33 UTC+1 schreef Jonathan Thornburg:
Nicolaas Vroom wrote:
Consider 3 different configurations:
1. A binary star system of 30...
Forum: Research March 3rd 16, 08:44 AM Posted to sci.astro.research
Replies: 9
Views: 686
Posted By Nicolaas Vroom
Ligo. What happened 1.3 billion years ago.

Op zondag 28 februari 2016 08:28:43 UTC+1 schreef Phillip Helbig:


The term "beast" here means large in mass, not in radius.

IMO the BH in the center of the Milkey Way is a beast,
almight a...
Showing results 1 to 25 of 212

 
Forum Jump

All times are GMT +1. The time now is 05:10 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright ©2004-2018 SpaceBanter.com.
The comments are property of their posters.