Jump to content

Reinventing Gravity: Difference between revisions

Add links
From Wikipedia, the free encyclopedia
Browse history interactively
Content deleted Content added
VisualWikitext
created page
 
Citation bot (talk | contribs)
Bots
5,248,191 edits
Altered issue. Added issue. | Use this bot. Report bugs. | Suggested by Spinixster | Category:Physics book stubs | #UCB_Category 21/64
 
(36 intermediate revisions by 19 users not shown)
Line 1: Line 1:
{{Infobox book
{{Infobox book
<!-- |italic title = (see above) -->
<!-- |italic title = (see above) -->
| name = Reinventing Gravity: A Physicist Goes Beyond Einstein
| name = Reinventing Gravity: A Physicist Goes Beyond Einstein
| image =
| image =
| image_size =
| caption =
| caption =
| alt =
| alt =
Line 15: Line 14:
| series =
| series =
| subject =
| subject =
| genre = [[Science text]]
| genre = Science text
| publisher =
| publisher =
| publisher2 =
| publisher2 =
Line 38: Line 37:
==Moffat's theory==
==Moffat's theory==


{{Main|MOG theory}}
⚫
Moffat's work culminates in his [[nonsymmetric gravitational theory]] and [[scalar–tensor–vector gravity]] (now called MOG). His theory explains [[galactic rotation curve]]s without invoking [[dark matter]]. He proposes a [[variable speed of light]] approach to [[physical cosmology|cosmological]] problems, which posits that ''[[gravitational constant|G]]''/''c'' is constant through time, but ''G'' and ''c'' separately have not been. Moreover, the [[speed of light]] ''c'' may have been much higher during early moments of the [[Big Bang]]. His recent work on [[Inhomogeneous cosmology|inhomogeneous cosmological model]]s purports to explain certain anomalous effects in the [[CMB]] data, and to account for the recently discovered acceleration of the expansion of the universe.


Moffat's work culminates in his [[nonsymmetric gravitational theory]] and [[scalar–tensor–vector gravity]] (now called MOG).<ref name=Moffat2006a>
==Praise for ''Reinventing Gravity''==
{{cite journal
| last = Moffat |first = J. W.
| year = 2006
| title = Scalar-Tensor-Vector Gravity Theory
| journal = [[Journal of Cosmology and Astroparticle Physics]]
| volume = 3 |issue = 3
| pages = 4
| arxiv = gr-qc/0506021
| doi = 10.1088/1475-7516/2006/03/004
⚫
. His theory explains [[galactic rotation curve]]s without invoking [[dark matter]]. He proposes a [[variable speed of light]] approach to [[physical cosmology|cosmological]] problems, which posits that ''[[gravitational constant|G]]''/''c'' is constant through time, but ''G'' and ''c'' separately have not been. Moreover, the [[speed of light]] ''c'' may have been much higher during early moments of the [[Big Bang]]. His recent work on [[Inhomogeneous cosmology|inhomogeneous cosmological model]]s purports to explain certain anomalous effects in the [[CMB]] data, and to account for the recently discovered acceleration of the expansion of the universe.


The theory is based on an [[action principle]] and postulates the existence of a [[vector field]], while elevating the three constants of the theory to [[scalar fields]]. In the [[weak-field approximation]], STVG produces a [[Yukawa potential|Yukawa]]-like modification of the gravitational force due to a point source. Intuitively, this result can be described as follows: far from a source gravity is stronger than the Newtonian prediction, but at shorter distances, it is counteracted by a repulsive [[fifth force]] due to the vector field.
The book was well received, although not uncontroversial, within scientific circles. ''Publishers Weekly'', in particular, said of Moffat: <quote>If his theory stands the test of time, Moffat will ahve created a paradigm shift not seen since Newton.</quote>

==Reception==

The book was positively reviewed in ''[[EE Times]]'', ''[[Physics World]]'' and ''[[Publishers Weekly]]''.<ref>{{cite web | url=http://www.eetimes.com/author.asp?section_id=31&doc_id=1284609 | title=Book Review: Reinventing Gravity by John Moffat | publisher=EE Times | date=2010-09-30 | accessdate=11 July 2013 | author=Maxfield, Clive}}</ref><ref>{{Cite journal |last=Amelino-Camelia |first=Giovanni |date=July 2009 |title=Beyond Einstein's gravity |url=https://iopscience.iop.org/article/10.1088/2058-7058/22/07/45 |journal=Physics World |volume=22 |issue=7 |pages=48–49 |doi=10.1088/2058-7058/22/07/45 |issn=0953-8585}}</ref><ref>{{cite web|url=http://www.publishersweekly.com/978-0-06-117088-1|title=Reinventing Gravity: A Physicist Goes Beyond Einstein|publisher=Publishers Weekly|date=2008-01-09|accessdate=2013-07-11}}</ref>


==See also==
==See also==
⚫
*[[Einstein Wrote Back]], another book by Moffat

==References==
{{reflist}}

[[Category:Popular physics books]]
[[Category:Theories of gravity]]
[[Category:2008 non-fiction books]]


⚫
*[[Einstein Wrote Back]], another book by Moffat


[[Category:Physics books]]
Physics

Latest revision as of 03:10, 11 April 2024

Reinventing Gravity: A Physicist Goes Beyond Einstein
AuthorJohn W. Moffat
LanguageEnglish
GenreScience text
Publication date
2008
Publication placeCanada
ISBN0-06-117088-7

Reinventing Gravity: A Scientist Goes Beyond Einstein is a science text by John W. Moffat, which explains his controversial theory of gravity.

Moffat's theory

[edit]
Main article: MOG theory

Moffat's work culminates in his nonsymmetric gravitational theory and scalar–tensor–vector gravity (now called MOG).[1] His theory explains galactic rotation curves without invoking dark matter. He proposes a variable speed of light approach to cosmological problems, which posits that G/c is constant through time, but G and c separately have not been. Moreover, the speed of light c may have been much higher (at least trillion trillion times faster than the normal speed of light) during early moments of the Big Bang.[2] His recent work on inhomogeneous cosmological models purports to explain certain anomalous effects in the CMB data, and to account for the recently discovered acceleration of the expansion of the universe.

The theory is based on an action principle and postulates the existence of a vector field, while elevating the three constants of the theory to scalar fields. In the weak-field approximation, STVG produces a Yukawa-like modification of the gravitational force due to a point source. Intuitively, this result can be described as follows: far from a source gravity is stronger than the Newtonian prediction, but at shorter distances, it is counteracted by a repulsive fifth force due to the vector field.

Reception

[edit]

The book was positively reviewed in EE Times, Physics World and Publishers Weekly.[3][4][5]

See also

[edit]

References

[edit]
  1. ^ Moffat, J. W. (2006). "Scalar-Tensor-Vector Gravity Theory". Journal of Cosmology and Astroparticle Physics. 3 (3): 4. arXiv:gr-qc/0506021. Bibcode:2006JCAP...03..004M. doi:10.1088/1475-7516/2006/03/004.
  2. ^ Peter Calamai (27 November 2005). "Einstein's respectful heretic". Toronto Star. Archived from the original on 24 October 2012. Retrieved 21 May 2011.
  3. ^ Maxfield, Clive (2010-09-30). "Book Review: Reinventing Gravity by John Moffat". EE Times. Retrieved 11 July 2013.
  4. ^ Amelino-Camelia, Giovanni (July 2009). "Beyond Einstein's gravity". Physics World. 22 (7): 48–49. doi:10.1088/2058-7058/22/07/45. ISSN 0953-8585.
  5. ^ "Reinventing Gravity: A Physicist Goes Beyond Einstein". Publishers Weekly. 2008-01-09. Retrieved 2013-07-11.


Stub icon

This article about a physics-related book is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Reinventing_Gravity&oldid=1218335154"