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Groups > sci.physics > #533148
| From | jimp@specsol.spam.sux.com |
|---|---|
| Newsgroups | sci.physics |
| Subject | Re: Do we need a new theory of gravity? |
| Date | 2015-11-14 22:47 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <49qkhc-bp5.ln1@mail.specsol.com> (permalink) |
| References | <w-mdnVDcJbvSLtrLnZ2dnUU7-U-dnZ2d@giganews.com> |
Sam Wormley <swormley1@gmail.com> wrote: > Do we need a new theory of gravity? >> http://phys.org/news/2015-11-theory-gravity.html > >> One of the real challenges in building theories of gravity is that >> you need to make sure that your theory makes sense at the very large >> cosmological scales, without predicting ludicrous things for the >> solar system, such as the moon spiralling into the earth. I don't >> think enough of that kind of synoptic analysis gets done. >> Cosmologists tend to focus on the cosmological properties and they >> don't always check: does my theory even allow stable stars and black >> holes to exist? Because if it doesn't, then you need to throw it out >> straight away. >> >> Over the past decade hundreds of researchers have come up with all >> sorts of ways to change gravity. Part of the problem now is that >> there are so many different theories that if you were to test each >> one individually it would take forever. I've done a lot of work on >> trying to come up with unified descriptions of these theories. If you >> can map them all onto a single mathematical formalism, all you have >> to do is test that one thing and you know what it means for all the >> different theories. >> >> In doing this mapping process we've discovered that a lot of the >> theories look very different to start with, but at the mathematical >> level they're moving along the same lines. It suggests to me that >> people are stuck in one way of thinking at the moment when they build >> these gravity theories, and that there's still room to do something >> completely different. >> >> More recently I've moved on to developing ways to actually test the >> mathematics ? to constrain it with data. For example, we can use >> gravitational lensing. If you have a massive object like a galaxy >> cluster, the light from objects behind it is bent by the gravity of >> the cluster. If you change your theory of gravity, you change the >> amount of bending that occurs. Basically we throw every piece of data >> we can get our hands on into constraining these frameworks and >> testing what works. >> >> At this precise moment the data we have is not quite good enough to >> distinguish between all the different gravity models. In other words, yet another cut and paste about nothing. -- Jim Pennino
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Do we need a new theory of gravity? Sam Wormley <swormley1@gmail.com> - 2015-11-14 16:18 -0600
Re: Do we need a new theory of gravity? Fabian Russell <root@localhost.localdomain> - 2015-11-14 22:44 +0000
Re: Do we need a new theory of gravity? Sam Wormley <swormley1@gmail.com> - 2015-11-14 17:03 -0600
Re: Do we need a new theory of gravity? Fabian Russell <root@localhost.localdomain> - 2015-11-14 23:24 +0000
Re: Do we need a new theory of gravity? Sam Wormley <swormley1@gmail.com> - 2015-11-14 17:26 -0600
Re: Do we need a new theory of gravity? Fabian Russell <root@localhost.localdomain> - 2015-11-15 00:08 +0000
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-14 17:56 -0800
Re: Do we need a new theory of gravity? HVAC <mr.hvac@gmail.com> - 2015-11-14 18:28 -0800
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-14 22:18 -0800
Why won't HVAC admit his NAMBLA membership? benj <nobody@gmail.com> - 2015-11-15 03:58 -0500
Re: Do we need a new theory of gravity? benj <nobody@gmail.com> - 2015-11-15 04:17 -0500
Re: Do we need a new theory of gravity? moroney@world.std.spaamtrap.com (Michael Moroney) - 2015-11-15 02:32 +0000
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-14 22:15 -0800
Re: Do we need a new theory of gravity? moroney@world.std.spaamtrap.com (Michael Moroney) - 2015-11-15 15:24 +0000
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-15 09:24 -0800
Re: Do we need a new theory of gravity? moroney@world.std.spaamtrap.com (Michael Moroney) - 2015-11-16 01:08 +0000
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-15 17:13 -0800
Re: Do we need a new theory of gravity? moroney@world.std.spaamtrap.com (Michael Moroney) - 2015-11-16 16:14 +0000
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-16 08:20 -0800
Re: Do we need a new theory of gravity? moroney@world.std.spaamtrap.com (Michael Moroney) - 2015-11-16 16:59 +0000
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-16 11:25 -0600
Re: Do we need a new theory of gravity? benj <none@gmail.com> - 2015-11-16 13:11 -0500
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-16 12:13 -0600
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-16 10:47 -0800
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-16 13:08 -0600
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-16 13:10 -0600
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-16 11:21 -0800
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-16 15:19 -0600
Re: Do we need a new theory of gravity? "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-16 15:42 -0800
Re: Do we need a new theory of gravity? "Y.Porat" <y.y.porat@gmail.com> - 2015-11-16 23:59 -0800
Re: Do we need a new theory of gravity? HVAC <mr.hvac@gmail.com> - 2015-11-16 15:48 -0800
Re: Do we need a new theory of gravity? Mahipal <mahipal7638@gmail.com> - 2015-11-16 16:19 -0800
Re: Do we need a new theory of gravity? "Y.Porat" <y.y.porat@gmail.com> - 2015-11-17 00:05 -0800
Re: Do we need a new theory of gravity? "Y.Porat" <y.y.porat@gmail.com> - 2015-11-16 23:55 -0800
Re: Do we need a new theory of gravity? "Y.Porat" <y.y.porat@gmail.com> - 2015-11-15 00:54 -0800
Re: Do we need a new theory of gravity? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2015-11-15 10:21 -0800
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-16 11:09 -0600
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-16 11:46 -0800
Re: Do we need a new theory of gravity? "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-16 12:32 -0800
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-16 15:28 -0600
Re: Do we need a new theory of gravity? Mahipal <mahipal7638@gmail.com> - 2015-11-16 13:41 -0800
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-16 14:48 -0800
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-16 17:24 -0600
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-16 16:53 -0800
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-17 10:07 -0600
Re: Do we need a new theory of gravity? "Y.Porat" <y.y.porat@gmail.com> - 2015-11-17 00:27 -0800
Re: Do we need a new theory of gravity? "Dave Smith" <invalid@exampll.com> - 2015-11-17 18:01 -0800
Re: Do we need a new theory of gravity? "Y.Porat" <y.y.porat@gmail.com> - 2015-11-17 00:24 -0800
Re: Do we need a new theory of gravity? moroney@world.std.spaamtrap.com (Michael Moroney) - 2015-11-17 17:07 +0000
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-17 11:11 -0800
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-17 11:28 -0800
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-17 14:00 -0600
Re: Do we need a new theory of gravity? john <johnsefton288@gmail.com> - 2015-11-17 12:11 -0800
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-17 14:45 -0600
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-17 14:51 -0600
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-17 15:00 -0600
Re: Do we need a new theory of gravity? moroney@world.std.spaamtrap.com (Michael Moroney) - 2015-11-17 20:30 +0000
Re: Do we need a new theory of gravity? Odd Bodkin <bodkinodd@gmail.com> - 2015-11-17 13:44 -0600
Re: Do we need a new theory of gravity? moroney@world.std.spaamtrap.com (Michael Moroney) - 2015-11-17 20:23 +0000
Re: Do we need a new theory of gravity? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2015-11-17 12:46 -0800
Re: Do we need a new theory of gravity? "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-17 14:00 -0800
Re: Do we need a new theory of gravity? xxein1@att.net - 2015-11-14 22:36 -0800
Re: Do we need a new theory of gravity? Fabian Russell <root@localhost.localdomain> - 2015-11-15 06:58 +0000
Re: Do we need a new theory of gravity? xxein1@att.net - 2015-11-14 23:21 -0800
Re: Do we need a new theory of gravity? Fabian Russell <root@localhost.localdomain> - 2015-11-15 07:26 +0000
Re: Do we need a new theory of gravity? Fabian Russell <root@localhost.localdomain> - 2015-11-15 07:40 +0000
Re: Do we need a new theory of gravity? xxein1@att.net - 2015-11-15 00:10 -0800
Re: Do we need a new theory of gravity? Fabian Russell <root@localhost.localdomain> - 2015-11-15 21:54 +0000
Re: Do we need a new theory of gravity? xxein1@att.net - 2015-11-17 11:35 -0800
Re: Do we need a new theory of gravity? jimp@specsol.spam.sux.com - 2015-11-14 22:47 +0000
Re: Do we need a new theory of gravity? "Y.Porat" <y.y.porat@gmail.com> - 2015-11-15 01:02 -0800
Re: Do we need a new theory of gravity? gilber34 <fafa@invalid.com> - 2015-11-15 14:13 -0600
Re: Do we need a new theory of gravity? "Y.Porat" <y.y.porat@gmail.com> - 2015-11-16 00:00 -0800
Re: Do we need a new theory of gravity? xxein1@att.net - 2015-11-17 11:28 -0800
Re: Do we need a new theory of gravity? Sam Wormley <swormley1@gmail.com> - 2015-11-17 13:46 -0600
Re: Do we need a new theory of gravity? xxein1@att.net - 2015-11-17 15:06 -0800
Re: Do we need a new theory of gravity? xxein1@att.net - 2015-11-17 15:36 -0800
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