Welcome to the MOND pages
The Modified Newtonian Dynamics (MOND) s a scientific theory proposed by Moti Milgrom as a solution to the missing mass problem in extragalactic astronomy. Rather than invoking some invisible form of dark matter, it hypothesizes a subtle change to the effective force law at extremely low accelerations (< 10-10 m/s/s).
- The basic issue, in brief, and what's at stake.
- The Dark Matter Tree (small | large | formal | new tree with pictures) showing the empirical roots of the mass discrepancy problem and the many proposed branches of solutions.
- Why consider MOND? |
Cosmic fallcies |
Attitude
- A comparison of how ΛCDM and MOND fare in various observational tests.
- Frequently Asked Questions
- The External Field Effect in MOND and its explanation
- Scientific Literature
- Extensive list of the literature concerning MOND, complete with links to the actual papers when available, and the occassional commentary.
- Funding: please visit Science Bucks
- Material concerning Dark Matter
- Experimental Searches for dark matter - a perpetual quest?
- Insightful article on the difficulty of objectivity, even in science.
- The Great Dark Matter Debate (11/18/2010 Bethe Colloquium, Bonn University, Germany).
- Also available at this local link.
- The Blind Men and the Garden.
- MOND in the news
- An interesting discussion at the Flamsteed Astronomy Society 5/14/2012
- Gas Rich Galaxies Confirm Prediction of Modified Gravity Theory press release 2/22/2011
- Viewpoint for PRL by Masters & Spekkens
- Original news articles: BBC | Science | Nature | motherboard | Science & Vie (in French)
- Other articles: io9 | redOrbit | PhysOrg | ScienceDaily | technologijos (in Lithuanian)
- The blogosphere reacts:
- User's Guide to the Universe | The Dayside | Cosmic Variance | Starts with a Bang | Weizman Wave | Particle Decelerator
- Trialogue with Rainer Plaga and Sean Carroll.
- Some remarks on cognitive dissonance
Rebuttal of criticisms made by Foreman & Scott and N. Gnedin.
- Further material, including older publications in the popular press and other MOND related sites.
- Material written at the Popular Level
- Philosophical aspects of the debate over Dark Matter and MOND
- Sure to provide fodder for sociologists and historians of science for decades to come.
- A popular perspective [HTML] | [PDF]
- written for Astronomy Now (January 2002)
- There have been a number of good, popular level reviews lately -
- see the appropriate section of the literature page.
- Milgrom's article for Scientific American (August 2002)
- Slides from talks related to MOND
- Review talk for Modifed Gravity Approaches to the Dark Sector, June 2010
- Colloquium given at DTM, April 2008
- Colloquium given at TRIUMF, February 2008
- Physics department colloquium given at George Mason University, April 2007.
- Review talk given at the Alternative Gravities and Dark Matter Workshop, April 2006.
- Physics department colloquium given at the University of Rochester, April 2006.
- Review talk given at the interdisciplinary conference Dark Matter in the Universe, October 2005.
- Material related to the Dynamical Evidence
- Comparison of MOND and Dark Matter | New table (11/2011)
- Includes a table itemizing various observational tests and how each fares.
- Example of a MOND fit to a rotation curve.
- Comparison of MOND and CDM fits to the rotation curve of NGC 1560.
- Lots and lots of fits (2003).
- These are plotted log(V)-log(R) for data with velocity errors < 5%.
- Points with error bars are the data; red lines are the fits; light blue lines are the Newtoinian stars+gas.
- Residuals of MOND fits (3/2012)
- Predictions made by Milgrom in 1983 which were subsequently confirmed (in 1998)
- A MOND fit to the rotation curve of a low surface brightness galaxy.
- Mass-to-Light Ratios and Stellar Populations
- Remarkably reasonable.
- Roster of galaxies which have been used to test MOND:
- 84-0-11
- MOND performs well in the Milky Way, providing detailed information about the surface density profile.
- N-body computations
- Modelers beware: implementing MOND is not a one line change to standard particle-pushing codes. Chris Mihos explains why. (The inertial modification is inherently nonlocal.) [See also a more sober write-up.]
- Other numerical approaches are necessary. For example, Brada's thesis; Ciotti, Londrillo, & Nipoti; Tiret & Combes.
- Material related to the Cosmic Microwave Background
- BBN: Comparison of the density of baryons in ΛCDM & MOND.
- 2006: The Third Peak in TeVeS (April 2006).
- 2006: WMAP finally reports new data (March 2006).
- 2005: BOOMERanG reports new data from its 2003 Antarctic flight (Aug. 2005).
- The WMAP second-year data are a year and half late and counting...
- 2004: The WMAP second-year data are late.
- 2003: No-CDM & WMAP (Feb. 2003).
- WMAP 1st:2nd peak amplitude ratio bang on the No-CDM prediction.
- WMAP polarization detection confirms the prediction of early reionization.
- The critical third peak remains ill-constrained.
- 2001: How the No-CDM prediction fares with DASI and updated (in May, 2001) BOOMERanG CMB data.
- 2000: No-CDM prediction realized in BOOMERanG microwave background data.
- Associated press release, Sept. 27, 2000.
- 1999: No-CDM model provides best-guess prediction for CMB in a MOND universe.
- Strictly speaking, only the shape of the power spectrum is predicted in the absence of CDM. This represents MOND only under the ansatz that a MOND version of GR is identical to standard GR in the early universe. More properly, this is a test for the existence of non-baryonic dark matter, and says nothing directly about MOND.
- Material related to the Bullet Cluster
- The missing baryon problem in MOND and ΛCDM.
- Comments on the Bullet Cluster claim to require dark matter.
- The full text of my reply to press inquiries (from which published quotes were extracted).
- Paper by Angus et al. fitting the new data.
- Preprint examining the collision velocity of the clusters. This is more naturally understood in terms of MOND than CDM. [Published in MNRAS (2008) 383, 417]
- The bullet cluster is also a problem for ΛCDM.
- Milgrom's comments on the Bullet Cluster
- An unsolicited, independent perspective
- Related talks by Angus: PPT | text
- The collision velocity of the bullet cluster in CDM and MOND.
- A counter-example to the bullet cluster - Abell 520.
- The dark matter ring in cluster 0024+17.
- Material related to Tidal Dwarfs
- A comparison of how ΛCDM and MOND fare in various observational tests.
- Can tidal dwarfs falsify dark matter?
MOND - dark matter - modified newtonain dynamics
MOND - dark matter - modified newtonain dynamics
MOND - dark matter - modified newtonain dynamics
MOND - dark matter - modified newtonain dynamics
Link to further material, including other MOND related sites. MOND - dark matter - modified newtonain dynamics
MOND - dark matter - modified newtonain dynamics
MOND - dark matter - modified newtonain dynamics
MOND - dark matter - modified newtonain dynamics
MOND - dark matter - modified newtonain dynamics
MOND - dark matter - Modified Newtonain Dynamics
MOND - dark matter - modified newtonain dynamics
On-line since 1997
