Jump to content


Photo

String theory and gravity

  • Please log in to reply
37 replies to this topic

#1 CharlesW

CharlesW

    Apollo

  • -----
  • Posts: 1329
  • Joined: 01 Nov 2012
  • Loc: Chula Vista & Indio, CA

Posted 11 January 2013 - 01:30 PM

I'm not a physisist so please take it easy on me. I've been watching the Sky At Night series on Youtube and they had a short discussion about string theory and gravity. It was the, "Our gravity might not be as strong as we think it should be because it is leaking into adjoining dimensions," argument. Assuming that this true for a moment and our gravity is leaking into other universes, what is leaking back our way? Or are we the "king of dimensions" and the sun rotates around the Earth, and we don't get anything from those other dimensions/universes?

#2 Pess

Pess

    (Title)

  • *****
  • Posts: 2881
  • Joined: 12 Sep 2007
  • Loc: Toledo, Ohio

Posted 11 January 2013 - 01:53 PM

There is a thought that dark matter may be gravity from other branes (a brane is kinda of a flat plane as opposed to a long string. ie: it is a string with length & width but no height whereas a string just has the length dimension).

This idea comes from M-theory and, may be, testable. If high energy particle collisions are found to yield less mass than the starting particles, it is theorized that this extra mass was knocked off 'our' brane into another dimension.

Pesse (In which case the Dimension of Cats would be very happy with all the extra string) Mist


#3 scopethis

scopethis

    Cosmos

  • *****
  • Posts: 8641
  • Joined: 30 May 2008
  • Loc: Kingman, Ks

Posted 11 January 2013 - 03:35 PM

I think string theory is wrong cause a string can only be stretched to a limit before it snaps..then the Universe will begin to collapse....

#4 deSitter

deSitter

    Still in Old School

  • -----
  • Posts: 6879
  • Joined: 09 Dec 2004

Posted 11 January 2013 - 03:55 PM

I'm not a physisist so please take it easy on me. I've been watching the Sky At Night series on Youtube and they had a short discussion about string theory and gravity. It was the, "Our gravity might not be as strong as we think it should be because it is leaking into adjoining dimensions," argument. Assuming that this true for a moment and our gravity is leaking into other universes, what is leaking back our way? Or are we the "king of dimensions" and the sun rotates around the Earth, and we don't get anything from those other dimensions/universes?


And I thought it was just my new diet..

String theory is said to be a theory of gravity because it contains a spin-2 boson. Since the spin-2 boson is not really gravity (it's just the spin-2 boson), all such claims by string theorists are nonsense, and in fact you will never see them cook up a set of equations that reproduce even Newtonian gravity, much less GR.

-drl

#5 mich_al

mich_al

    Vanguard

  • *****
  • Posts: 2444
  • Joined: 10 May 2009
  • Loc: Rural central lower Michigan Yellow Skies

Posted 11 January 2013 - 08:14 PM

brane == membrane

just sayin

#6 llanitedave

llanitedave

    Humble Megalomaniac

  • *****
  • Posts: 22580
  • Joined: 25 Sep 2005
  • Loc: Amargosa Valley, NV, USA

Posted 11 January 2013 - 11:05 PM

Probably at this point better thought of as a meme-brane.

#7 Pess

Pess

    (Title)

  • *****
  • Posts: 2881
  • Joined: 12 Sep 2007
  • Loc: Toledo, Ohio

Posted 14 January 2013 - 04:42 PM

I think string theory is wrong cause a string can only be stretched to a limit before it snaps..then the Universe will begin to collapse....


Pesse (Collapse? or unravel?) Mist

#8 scopethis

scopethis

    Cosmos

  • *****
  • Posts: 8641
  • Joined: 30 May 2008
  • Loc: Kingman, Ks

Posted 15 January 2013 - 08:47 PM

that indicates that the Universe is nothing more than a big ball of twine....

#9 Ira

Ira

    Mercury-Atlas

  • *****
  • Posts: 2633
  • Joined: 22 Aug 2010
  • Loc: Mitzpe Ramon, Israel

Posted 17 January 2013 - 08:47 PM

Call the plumber. I can't afford to loose any more mass from my brain.

/Ira

#10 Pess

Pess

    (Title)

  • *****
  • Posts: 2881
  • Joined: 12 Sep 2007
  • Loc: Toledo, Ohio

Posted 18 January 2013 - 05:34 PM

that indicates that the Universe is nothing more than a big ball of twine....


I found an alternate universe!

Posted Image

#11 llanitedave

llanitedave

    Humble Megalomaniac

  • *****
  • Posts: 22580
  • Joined: 25 Sep 2005
  • Loc: Amargosa Valley, NV, USA

Posted 18 January 2013 - 10:47 PM

Well, don't just string us along!

#12 deSitter

deSitter

    Still in Old School

  • -----
  • Posts: 6879
  • Joined: 09 Dec 2004

Posted 19 January 2013 - 11:18 AM

Do they have good Chicago-style pizza? You can't find that anywhere these days!

-drl

#13 Skip

Skip

    Starlifter Driver

  • *****
  • Posts: 3940
  • Joined: 23 Jan 2008
  • Loc: Fort Worth, Texas, USA

Posted 19 January 2013 - 11:20 AM

Are you implying that Chicago pizzas are stringy, or that they have lots of gravity?

:grin:

#14 deSitter

deSitter

    Still in Old School

  • -----
  • Posts: 6879
  • Joined: 09 Dec 2004

Posted 19 January 2013 - 11:25 AM

If the cheese is right, both!

-drl

#15 scopethis

scopethis

    Cosmos

  • *****
  • Posts: 8641
  • Joined: 30 May 2008
  • Loc: Kingman, Ks

Posted 19 January 2013 - 05:08 PM

I do believe Pess is onto something...the alternative Universe twine ball is unraveling and seeping into our Universe..that outta make for a good scientific "yarn"...

#16 Jarad

Jarad

    Fly Me to the Moon

  • *****
  • Posts: 6387
  • Joined: 28 Apr 2003
  • Loc: Atlanta, GA

Posted 19 January 2013 - 11:00 PM

Now you're just trying to string us along...

Jarad

#17 scopethis

scopethis

    Cosmos

  • *****
  • Posts: 8641
  • Joined: 30 May 2008
  • Loc: Kingman, Ks

Posted 20 January 2013 - 02:07 PM

it's that term "fabric" of the Universe that is undefined..is it string, netting, some sort of mesh or webbing, or perhaps some large old discarded pelt from that neighboring Universe...

#18 EJN

EJN

    Vanguard

  • *****
  • Posts: 2241
  • Joined: 01 Nov 2005
  • Loc: 53 miles west of Venus

Posted 20 January 2013 - 03:48 PM

it's that term "fabric" of the Universe that is undefined..is it string, netting, some sort of mesh or webbing, or perhaps some large old discarded pelt from that neighboring Universe...


The fabric of the universe is 60% cotton and 40% polyester, and should only be
washed using the "permanent press" setting.

#19 Pess

Pess

    (Title)

  • *****
  • Posts: 2881
  • Joined: 12 Sep 2007
  • Loc: Toledo, Ohio

Posted 21 January 2013 - 09:22 AM

I left the Universe on the High-Heat setting too long.

Pesse (Scientists are set to announce that the Universe is now contracting.) Mist

#20 llanitedave

llanitedave

    Humble Megalomaniac

  • *****
  • Posts: 22580
  • Joined: 25 Sep 2005
  • Loc: Amargosa Valley, NV, USA

Posted 21 January 2013 - 12:41 PM

Was it an accident, or do you have a scorched universe strategy?

#21 scopethis

scopethis

    Cosmos

  • *****
  • Posts: 8641
  • Joined: 30 May 2008
  • Loc: Kingman, Ks

Posted 21 January 2013 - 05:46 PM

I've also read that that the Universe is contracting..this is caused by heat loss and a colder environment..things always shrink when they get cold...

#22 Napersky

Napersky

    Vanguard

  • *****
  • Posts: 2038
  • Joined: 27 Jan 2010
  • Loc: Chicagoland

Posted 22 January 2013 - 12:52 PM

http://www.amazon.co...64/ref=sr_1_...

by Peter Woit

:)

#23 Pess

Pess

    (Title)

  • *****
  • Posts: 2881
  • Joined: 12 Sep 2007
  • Loc: Toledo, Ohio

Posted 23 January 2013 - 10:30 AM

http://www.amazon.co...64/ref=sr_1_...

by Peter Woit

:)


That book was written in 2007'. Since then there have been suggestions that, at least, some small aspects of Superstring theory can be testable.

One problem is that we are talking at size levels for strings that makes measurements at distances less than what the Heisenberg uncertainty principle would allow.

According to Quantum theory we can't be precise enough to take a measurement of a single string...

However, in order for the general category of Superstring theories (and there are a lot!) something called Super-symmetry' must exist. Which, in very simple terms, means that every particle must have a matching particle with opposite spin.

So far, we know that this isn't the universe 'today'. Quarks have a preferential 'spin' and their counterpart is not found. However, these original supersymmetric quarks could have a preferential spin and selectively survived the original Universe after the big bang prior to which they were in equal numbers.

OK, that was a mouthful. But what does it have to do with String Theory? Well, the Higss Bosun was found at a weird (unnatural) energy level. If Supersymmetry was correct, then we should find a range of Higgs particles at different energy levels.

These Supersymmetric version of the Higgs would be evidence that, perhaps, there was something to Supersymmetry and, by extension, would be a supporting argument for String Theory.


Pesse (Higgs? Higgs? Who has the Higgs?) Mist

#24 jkaiser

jkaiser

    Sputnik

  • -----
  • Posts: 45
  • Joined: 07 Jan 2013
  • Loc: Wood River Junction, Rhode Island

Posted 31 January 2013 - 06:32 AM

Should have been dry cleaned only

#25 HiggsBoson

HiggsBoson

    Surveyor 1

  • *****
  • Posts: 1528
  • Joined: 21 Feb 2007
  • Loc: Kal-li-fornia

Posted 01 February 2013 - 07:51 PM

Pesse (Higgs? Higgs? Who has the Higgs?) Mist


If you need some I have extras...






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics