46. First Workshop on Progress in Modelling Galaxy Formation and Evolution in Milgromian dynamics — first results achieved with the Phantom of Ramses (PoR) code

[Note: This web-page is being updated continuously:
current status: 26.09.15]

Observatoire astronomique de Strasbourg, Universite de Strasbourg, CNRS UMR 7550, Sept. 21st - 25th 2015

Below are provided
ORGANISERS: Benoit Famaey (Strasbourg) and Pavel Kroupa (Bonn)

1.BACKGROUND / MOTIVATION: Galaxy-scale data seem to be in accordance with the hypothesis that the extrapolation of Newtonian gravitation by orders of magnitude below the Solar system space-time curvature breaks down completely, and that collisionless astronomical systems behave according to space-time scale-invariant dynamics, as postulated by Mordehai Milgrom (2015). The classical theories of dynamics and gravitation underlying this symmetry, often referred to as MOND  theories, show a richer dynamical behaviour with new phenomena which appear non-intuitive to a Newtonian mind. Very successful analytical results have been obtained in this dynamics framework, such as accounting for the hitherto not understood properties of polar-ring galaxies (Lueghausen et al. 2013), accounting for the Bullet cluster (Angus, Fmaey & Zhao 2006Angus & McGaugh 2008) and the properties of disk galaxies (MOND reviews by Scarpa 2006; Famaey & McGaugh 2012;Trippe 2014) and elliptical galaxies (Sanders 2000; Milgrom & Sanders 2003; Scarpa 2006).

But little understanding of the dynamical behaviour of live Milgromian systems has been gathered. Live calculations, i.e. simulations of galaxies, are required in order to test, to possibly refine or to falsify this approach. The implications for fundamental physics are major in any case!

A series of Milgromian-dynamics workshops is planned to begin remedying this situation.

With this first “Phantom of Ramses” (PoR) meeting, the aim is to bring together the pioneers who have been daring footsteps into applying Milgromian dynamics to simulate live galaxies. First simulations of galaxies within MOND have been achieved with the first Milgromian Nbody code without gas (Brada & Milgrom 1999). Tiret & Combes (2007) re-visited this problem with their own code. The PhD thesis of Tiret is available here (in French). For spheroidal geometries MOND simulations have become possible with the NMODY code by Nipoti, Londrillo & Ciotti (2007), see e.g. the application of this code to the phase-transition of spheroidal systems on radial orbits (Wu & Kroupa 2013). A MOND code has also been developed for studies of cosmological structure formation by Ilinares, Knebe & Zhao (2008). While being highly successful in their ability to represent observed galaxies, all of these attempts have died-off due to a lack of long-term sustainability.

Now much more involved and more numerous studies has become possible with the first publicly available Milgromian dynamics computer code including star formation, i.e. baryonic physics (Lueghausen, Famaey & Kroupa 2015) with which even full-scale simulations of cosmological structure formation have become achievable, PoR being an official patch to Teyssier’s RAMSES code. A similar computer code (RAyMOND) has been developed independently by a Chilean research group (Candlish, Smith & Fellhauer 2015).

Because non-linear Milgromian dynamics is largely non-intuitive for researchers trained to think within the framework of linear Newtonian gravitation, this group of pioneers needs to find the chance to discuss, in as great depth as is required, the issues arising with initialising, setting-up and evolving Milgromian galaxies in virial equilibrium, including gas dynamics and star formation. The first scientific results which have already been achieved with the PoR code will be discussed at this occasion, but research related to Milgromian dynamics (e.g. by adoption of zeroth-order approximations by adding dark matter particles to Newtonan systems) will also be discussed.

The meeting will take place at the Observatoire astronomique de Strasbourg. We are planning a whole week for this event, whereby there will be one to two (at most three)  presentations per day interrupted with long discussion breaks to dwell upon problems that have been encountered and that may need solutions. Also, the breaks are intended to allow new persons to learn using PoR. The meeting will take place in the *MEETING ROOM* (with a capacity of about 20) at the Observatoire, and the presentations can be of any duration, but must have a break after the first 45 minutes if longer. After the last presentation each day discussions may continue at will, and Strasbourg offers many excellent culinary opportunities for the evening entertainments.

Please register by sending an e-mail to Benoit Famaey <benoit.famaey_at_astro.unistra.fr> and to Pavel Kroupa <pavel_at_astro.uni-bonn.de>.

Note that this meeting does not have invited talks. The attendance is limited to 20.
3.PARTICIPANTS (preliminary):

Garry Angus (Brussel, Belgium)
Indranil Banik (St. Andrews, UK)
Christian Boily (Strasbourg, France)
Joerg Dabringhausen (remotely from Concepcion, Chile)
Benoit Famaey (Strasbourg, France) [SOC]
Martin Feix (Paris, France)
Hector Flores (Paris, France)
Alistair Hodson (St. Andrews, UK)
Rodrigo Ibata (Strasbourg, France)
Tereza Jerabkova (Praha, Czech Rep.)
Pavel Kroupa (Bonn, Germany) [SOC]
Fabian Lüghausen (Bonn, em.; tbc)
Marcel Pawlowski (Cleveland, USA)
Florent Renaud (Surrey, UK)
Jean-Babtiste Salomon (Strasbourg, France)
Ingo Thies (Bonn, Germany)
Guillaume Thomas (Strasbourg, France)
Yanbin Yang (Pairs, France)
HongSheng Zhao (St. Andrews, UK)

Conference Photo (24.09.2015):


Left to right:  Yanbin Yang, Indranil Banik, Ingo Thies, Guillaume Thomas, Garry Angus, Jean-Babtiste Salomon, Tereza Jerabkova, HongSheng Zhao, Rodrigo Ibata, Marcel Pawlowski, Hector Flores, Alistair Hodson, Florent Renaud, Benoit Famaey, Fabian Lueghausen, Pavel Kroupa

Hotel Esplanade
ETC Hotel
Hotel Roses
Au Cerf d’Or
des Princes
The programme, abstracts and list of participants are available here as a pdf file:

PROGRAM (with downloadable presentations):  

First Workshop on Progress in Modelling Galaxy Formation and Evolution in Milgromian dynamics —
first results achieved with the Phantom of Ramses (PoR) code.
At the Observatoire astronomique de Strasbourg, 21.09.-25.09.2015.

PoR-code talks are scheduled for the afternoons allowing for discussion and learning time.  A few scientific talks relevant to the mass-deficit problem are scheduled for the mornings.

******* Sunday, 20th September

evening, approximately 18:00-
Meet for drink and food at Au Brasseur
******* Monday, 21st September 10:00 MORNING COFFEE 10:30 Welcome/Introduction/First presentation and discussion: Setting the scene: 1. Kroupa_PoR.pdf: Why is the dark-matter approach ill-fated? (Pavel Kroupa) 2. Famaey.pdf: The basics of Milgromian dynamics/MOND (Benoit Famaey) LUNCH (12:15-14:45) 15:00-16:15 1. Lueghausen_PoR.pdf: The PoR code (Fabian Lueghausen) 2. Thies_PoR.pdf: Setting up a stable disc galaxy in PoR (Ingo Thies) 16:30 AFTERNOON TEA 17:00-18:00  Open Discussion ******* Tuesday, 22nd September 10:00 MORNING COFFEE 10:45-11:15 (30 minutes) Angus_PoR.pdf: The DiskMass Survey’s implications for MOND, CDM and itself  (Garry Angus) LUNCH (12:15-14:45)   14:45-15:15 (30 minutes) Banik.pdf: The External Field Effect In QUMOND: Application To Tidal Streams (Indranil Banik) 16:10 AFTERNOON TEA 16:30 Thomas_PoR.pdf: Simulating Tidal Streams with PoR (Guillaume Thomas) PoR Movie (dSph Sgr, slide 19 in presentation): YouTubelink 17:00-18:00  Open Discussion - decision to set up PhantomWIKI ******* Wednesday, 23rd September 10:00 MORNING COFFEE 10:45-11:15 Yang_PoR.pdf: (30 minutes) Reproducing properties of MW dSphs as descendants of DM-free TDGs (Yanbin Yang) MEETING PHOTO  (12:15) LUNCH (12:20-14:45) 14:15-14:45 Angus2_PoR.pdf: The sub-subhalo connection to M31’s plane of satellites (Garry Angus) 14:45-15:15 Pawlowski_PoR.pdf: (30 minutes) Small-scale problems of cosmology and how modified dynamics might address them (Marcel Pawlowski) 16:00 AFTERNOON TEA 16:30 Renaud_PoR.pdf: Gravitation-triggered star formation in interacting galaxies (Florent Renaud) 17:30-18:00  Open Discussion 18:30--  Workshop dinner at Au Brasseur
******* Thursday, 24th September 10:30 MORNING COFFEE 10:45-11:15 Hodson_PoR.pdf: (30 minutes)  EMOND (Extended MOND) and effective galaxy cluster masses (Alistair Hodson) 11:30-12:00 Preliminary results on QMOND forces between point masses (HongSheng Zhao) LUNCH (12:15-14:45) 14:45-15:15  Salomon_PoR.pdf: The tangential motion of the Andromeda System (Jean-Babtiste Salomon) 15:15-15:45 Dabringhausen_PoR.pdf: Early-type galaxies in Milgromian dynamics (Joerg Dabringhausen, remotely from Concepcion, Chile) 16:15 AFTERNOON TEA 16:45-17:15 Banik2_PoR.pdf: Evidence for Dynamical Heating in The Local Group (Indranil Banik) 17:15-18:00  Open Discussion ******* Friday, 25th September 10:00 MORNING COFFEE 10:30-12:00 Kroupa_IMF_Strasbrourg.pdf Main Seminar of the Observatory: Is the stellar IMF a probability distribution function, or is star formation highly regulated? (Pavel Kroupa) LUNCH (12:15-14:45) 15:00 Final discussion and FAREWELL

This wiki is dedicated to supporting the research making use of the “Phantom of RAMSES” (PoR) patch.

5 thoughts on “46. First Workshop on Progress in Modelling Galaxy Formation and Evolution in Milgromian dynamics — first results achieved with the Phantom of Ramses (PoR) code

  1. Greetings!I   have just found out the coming workshop and i understand it is too late to submit a paper for the workshop. But I wonder if I could attend the workshop as a participant. I am a professor of economics in Korea. Thank you.

    Sincerely yours,
    Lin chen


  2. I think that Stephen Hawking did not calculate with the possibility of a chiral oscillating Higgs field vacuum lattice combined with propeller shaped Fermions. Then, due to Vacuum chirality, Electron- and Positron propellers could both pushed away from the BH horizon after spin flip polarization at different distances, forming two charged separated spheres. With quark ( plasma) formation in between.

    Based on such a simple object ( propeller and process) oriented ontology, Black Holes could be imagined as charge splitters violating the 2e law af thermodynamics, combined with a continuous microscopic big bang plasma creation process!

    The result I try to describe :
    1: Black holes are the same as Dark Matter, they all consume photons, even gravitons and the Higgs field, but REPEL Fermions due to their propeller shape. They produce electric charged plasma.
    2: Dark Energy is the oscillating ( Casimir) energy of the Higgs Field equipped with a tetrahedron lattice structure with variable Planck length..
    3: Quantum Gravity = Dual Push gravity= Attraction (Higgs-Casimir opposing Graviton push).
    4: The Big Bang is a Splitting dark matter Big Bang Black Hole (BBBH), splitting into smaller Primordial Big Bang Spinters (PBBS) forming the Fractalic Lyman Alpha forest and evaporating partly into a zero mass energetic oscillating Higgs particle based Higgs field.
    5: Dual PBBSs hotspots, produce central plasma concentration in electric Herbig Haro systems as a base for star formation in open star clusters as a start for Spiral Galaxies.
    6: Spiral Galaxies will keep both Primordial Dark Matter Black Holes as Galaxy Anchor Black Holes (GABHs) at long distance.
    7: After Galaxy Merging, these GABHs are the origin of
    Galaxy- and Magnetic field complexity and distant dwarf galaxies .
    8: Black Holes produce Plasma direct out of the Higgs field because two Higgs particles are convertible into symmetric electron and positron (or even dual quark-) propellers (by BH horizon fluctuations).
    9: The chirality of the (spiralling) vacuum lattice is the origin our material universe. (propeller shaped positrons merge preferentially first with gluons to form (u) Quarks to form Hydrogen.
    10: The first Supernovas produce medium sized Black Holes as the base for secondary Herbig Haro systems and open star clusters.
    11: ALL Dark Matter Black Holes are supposed to be CHARGE SEPARATORS with internal positive charge and an external globular shell of negative charged Quark electron plasma.
    12: The lightspeed is related to gravity fields like the earth with long extinction distances to adapt with the solar gravity field.
    13. Quantum FFF Theory states that the raspberry shaped multiverse is symmetric and instant entangled down to the smallest quantum level. Also down to living and dying CATS in BOXES.
    If our material universes has a chiral oscillating Higgs field, then our material Right Handed DNA helix molecule could be explained.
    However it also suggests that in our opposing ANTI-MATERIAL multiverse neighbour universe the DNA helix should have a LEFT HANDED spiral.
    According to Max Tegmark: in an entangled multiverse we may ask: is there COPY PERSON over there, who is reading the same lines as I do?
    If this COPY person is indeed living over there, then even our consciousness should be shared in a sort of DEMOCRATIC form,
    Then we are not alone with our thoughts and doubts,see:
    Democratic Free Will in the instant Entangled Multiverse.

    Click to access 1401.0071v2.pdf

    See also: vixra.org/author/leo_vuyk

    308. Cryo Meteors


  3. “… Evolution of Milgromian Dynamics …” In the future, I suggest that any conference on Milgromian Dynamics should have at least a mention of the socio-economic aspects of the search for dark matter particles versus research on Milgromian dynamics.
    Consider the economics, politics, and sociology of a project such as the following:
    http://xenon.astro.columbia.edu/XENON10_Experiment/Collaboration/ The XENON Dark Matter Project
    If you were a scientist-administrator supervising 23 people and spending $700,000 U.S. dollars per year, you would be unlikely to be capable of objectively evaluating Milgromian dynamics — HUMAN NATURE IS NOT EASILY OVERCOME!


  4. In conferences on MOND, I think that gravitational metrologists should be invited. By sending out emails, I find that there is a widespread misconception that MOND has been refuted by Bullet Cluster data. Gravitational metrologists seem not to be aware of the extent of the empirical evidence in favor of MOND.
    I conjecture that gravitational metrologists are confused because they have ignored MOND.


  5. Are pro-MOND conferences important for the future of physics? Let us return in imagination to the year 1983 C.E. If Milgrom says that MOND is empirically valid, and ten thousand astrophysicists say that MOND is empirically invalid, then MIlgrom is not necessarily wrong. Science is never a popularity contest. Valid empirical evidence does not change according to human preconceptions. I suggest that, at the next pro-MOND conference, the pro-MOND astrophysicists select an emissary to be sent to a gravitational metrology conference. My impression is that gravitational metrologists are more-or-less unaware of MOND or believe that MOND has been refuted by the Bullet Cluster data. I suggest that gravitational metrologists might be open to an explanation of the empirical evidence in favor of MOND, especially if a fairly large group of pro-MOND astrophysicists can form a consensus. According to Speake and Quinn, “So far, both the equivalence principle and Newton’s inverse square law have survived experimental scrutiny. To maximize sensitivity and to relieve the burden of metrology, however, those experimental tests are cleverly designed to give a substantial signal only if nature misbehaves in the way sought out by the experimentalists.”
    http://scitation.aip.org/content/aip/magazine/physicstoday/article/67/7/10.1063/PT.3.2447 “The search for Newton’s constant” by Clive Speake and Terry Quinn, Physics Today, July 2014
    My guess is that strong pro-MOND evidence already exists in the data from gravitational metrology.


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