The Stellar Populations and Dynamics Research Group
(The SPODYR Group)
News items (recent peer-reviwed research publications are further below):
"Our model of the universe has been falsified: the cosmological
standard model is wrong"
February 14th, 2023. A piece written up for iai (Institute for Arts and Ideas, London).
The Bonn-Prague meeting on stellar populations, gravitational
dynamics and MOND-based cosmology The JH-Meeting 2022
"Dark Matter Doesn't Exist"
July 12th, 2022. A piece written up for iai (Institute for Arts and Ideas, London).
Colloquium at Sun Yat-sen University: "The stellar Initial Mass Function"
April 7th, 2022. The modern astrophysical understanding of the IMF and
its variation
Astronomy on Tap Koeln: "Dark Matter Kindergarten Stuff"
March 3rd, 2022. Can the existence of dark matter be disproven?
HYPERRAUM.TV: "Dunkle Welt oder Kosmos im Licht?"
February 22nd, 2022. A discussion of the competing models. In German.
HYPERRAUM.TV: "Der Astro-Rebell"
December 17th, 2021. The elementary reason why the Hubble tension is
not a tension. In German.
HYPERRAUM.TV: "Die vierte Kraft"
December 11th, 2021. Why has dark matter not been found? In German.
Golden Webinar: "From Believe to Realism and Beauty: Given the Non-Existence of Dark Matter, how do I navigate amongst the Stars and between Galaxies?"
April 9th, 2021, Golden Webinar on YouTube
Supermassive black holes: monsters in the early Universe
Oct.21st, 2021, Quid Ultra? lecture on YouTube
Oxford University Press Blog, Nov.3rd, 2020
The nature of very high redshift quasars and the rapid formation of super-massive black holes (SMBHs)
Very high redshift quasars and the rapid emergence of
super-massive black holes
The enduring mystery of how galaxies grow up
Oxford University Press Blog, Sept.28th, 2020
Constraints on the star formation histories of
galaxies in the Local Cosmological Volume
A travel report for the Erasmus+ programme led by Petr Kabath at
Onrejov Observatory:
La Palma, three events in the Orion Nebula Cluster and the Corona Crisis
The citizens of my birth of town, Jindrichuv Hradec , awarded me a Crystal Rose on
Recent Publications:
On the degree of stochastic asymmetry in the tidal tails of star clusters
Pflamm-Altenburg, Kroupa, Thies, Jerabkova, Beccari, Prusti, Boffin
(A & A, 2023)
The Possible Emergence of an Attractive Inverse-Square Law from the Wave-Nature of Particles
Zhang, Kroupa, Pflamm-Altenburg, Schmid
(Advances in High Energy Physics, 2022)
Simulations of star forming main sequence galaxies in Milgromian gravity
Nagesh, Kroupa, Banik, Famaey, Ghafourian, Roshan, Thies, Zhao, Wittenburg
(MNRAS, 2022)
The most massive stars in very young star clusters with a limited mass: Evidence favours significant self-regulation in the star formation processes
Zhiqiang, Jerabkova, Kroupa
(A & A, 2022)
Has JWST already falsified dark-matter-driven galaxy formation?
Haslbauer, Kroupa, Hasani Zonoozi, Haghi
(APJL, in press)
Asymmetrical tidal tails of open star clusters: stars crossing their
cluster's prah challenge Newtonian gravitations
Kroupa, Jerabkova, Thies, Pflamm-Altenburg, Famaey, Boffin, et al.
(MNRAS, 2022)
The giants that were born swiftly - implications of the top-heavy stellar initial mass function on the birth conditions of globular clusters
Wirth, Kroupa, Haas, Jerabkova, Yan, Subr
(MNRAS, 2022)
The formation of early-type galaxies through monolithic collapse of gas clouds in Milgromian gravity
Eappen, Kroupa, Wittenburg, Haslbauer, Famaey
(MNRAS, 2022)
The distribution and morphologies of Fornax Cluster dwarf galaxies suggest they lack dark matter
Asencio, Banik, Mieske, Venhola, Kroupa, Zhao
(MNRAS, 2022)
3D hydrodynamic simulations for the formation of the Local Group satellite planes
Banik, Thies, Truelove, Candlish, Famaey, Pawlowski, Ibata, Kroupa
(MNRAS, 2022)
Overestimated inclinations of Milgromian disc galaxies: the case of the ultradiffuse galaxy AGC 114905
Banik, Togere Nagesh, Haghi, Kroupa, Zhao
(MNRAS, 2022)
Far-ultraviolet investigation into the galactic globular cluster M30 (NGC 7099): II. Potential X-ray counterparts and variable sources
Mansfield, Dieball, Kroupa, Knigge, Zurek, Shara, Long
(MNRAS, 2022)
Far-ultraviolet investigation into the galactic globular cluster M30 (NGC 7099): I. Photometry and radial distributions
Mansfield, Dieball, Kroupa, Knigge, Zurek, Shara, Long
(MNRAS, 2022)
The High Fraction of Thin Disk Galaxies Continues to Challenge LCDM Cosmology
Haslbauer, Banik, Kroupa, Wittenburg, Javanmardi
(ApJ, 2022)
Do the majority of stars form as gravitationally unbound?
Dinnbier, Kroupa & Anderson
(A&A, 2022)
First detection of a magnetic field in low-luminosity B[e] stars:
New scenarios for the nature and evolutionary stages of FS CMa stars
Korcakova, Sestito, Manset, Kroupa, Votruba et al.
(A&A, 2022)
The dynamics of spatially confined oscillations
Stadtler, Kroupa, Schmid
(CaJPh, 2021)
The initial mass function of stars and the star-formation rates of galaxies
Kroupa, Jerabkova
(Book Chapter)
On the dynamical evolution of Cepheids in star clusters
Dinnbier, Anderson, Kroupa
(A&A, 2022)
Estimating the ages of open star clusters from properties of their extended tidal tails
Dinnbier, Kroupa, Subr, Jerabkova
(ApJ, 2021)
A possible solution to the Milky Way's binary-deficient retrograde
stellar population. Evidence that omega Centauri has formed in an extreme starburst
Marks, Kroupa, Dabringhausen
(A&A, 2021)
BiPoS1 -- a computer programme for the dynamical processing of the initial binary star population
Dabringhausen, Marks, Kroupa
(MNRAS, 2021)
Origin of the spectacular tidal shells of the galaxy NGC474
Bilek, Fensch, Ebrova et al.
(A&A, 2021)
Are disks of satellites comprised of tidal dwarf galaxies?
Bilek, Thies, Kroupa, Famaey
(Glaxies, 2021)
HI mapping of the Leo Triplet: Morphologies and kinematics of tails and bridges
Wu, Martinez-Delgado, Henkel, Kroupa, Walter, et al.
(Astron. and Astroph., 2021)
The Kennicutt-Schmidt law and the main sequence of galaxies in Newtonian and milgromian dynamics
Zonoozi, Lieberz, Banik, Haghi, Kroupa
(MNRAS, 2021)
How many explosions does one need? -- Quantifying supernovae in globular clusters from iron abundance spreads
Wirth, Jerabkova, Yan et al.
(MNRAS, 2021)
Evolution of globular-cluster systems of ultra-diffuse galaxies due to dynamical friction in MOND gravity
Bilek, Zhao, Famaey et al.
(MNRAS, 2021)
Downsizing revised: Star formation timescales for elliptical galaxies with an environment-dependent IMF and number of SNIa
Yan, Jerabkova, Kroupa
(A&A, 2021)
Fast galaxy bars continue to challenge standard cosmology
Roshan, Ghafourian et al.
(MNRAS, 2021, in press)
A discontinuity in the luminosity-mass relation and fluctuations in the evolutionary tracks of low-mass and low-metallicity stars at the Gaia M-dwarf gap
Mansfield & Kroupa
(A&A, 2021)
Do ultra compact dwarf galaxies form monolithically or as merged star cluster complexes?
Mahani, Zonoozi, Haghi, Jerabkova, Kroupa, Mieske
(MNRAS, 2021)
IMF-induced intrinsic uncertainties on measuring galaxy distances based on the number of giant stars: the case of the ultra-diffuse galaxy NGC 1052-DF2
Zonoozi, Haghi, Kroupa
(MNRAS, 2021)
On the absence of backsplash analogues to NGC 3109 in the LCDM framework
Banik, Haslbauer, Pawlowski, Famaey, Kroupa
(MNRAS, 2021)
Barred spiral galaxies in modified gravity theories
Roshan, Banik, Ghafourian, Thies, Famaey, Asencio, Kroupa
(MNRAS, 2021)
3D Morphology of Open Clusters in the Solar Neighborhood with Gaia EDR3: its Relation to Cluster Dynamics
Pang, Li, Yu, Tang, Dinnbier, Kroupa, Pasquato, Kouwenhoven
(ApJ, 2021)
The Phantom of RAMSES user guide for galaxy simulations using Milgromian and Newtonian gravity
Nagesh, Banik, Thies, Kroupa, Famaey, Wittenburg, Parziale, Haslbauer
(Canadian Journal of Physics, 2021)
A massive blow for LCDM - the high redshift, mass, and collision
velocity of the interacting galaxy
cluster El Gordo contradicts concordance cosmology
Asencio, Banik, Kroupa (MNRAS, 2021)
The Global Stability of M33 in MOND
Banik, Thies, Famaey, Candlish, Kroupa, Ibata (ApJ, 2020)
The Lifetimes of Star Clusters Born with a Top-heavy IMF
Haghi, Safaei, Zonoozi, Kroupa (ApJ, 2020)
The KBC void and Hubble tension contradict LCDM on a Gpc scale - Milgromian dynamics as a possible solution
Haslbauer, Banik, Kroupa (MNRAS, 2020)
Very high redshift quasars and the rapid emergence of super-massive black holes
Kroupa, Subr, Jerabkova, Wang (MNRAS, 2020)
Constraints on the star formation histories of galaxies in the Local Cosmological Volume
Kroupa, Haslbauer, Banik, Nagesh, Pflamm-Altenburg (MNRAS, 2020)
2015: Phantom of Ramses (PoR) code for galaxy formation and evolution in
Milgromian dynamics/MOND:
Phantom of Ramses (PoR) code is a
patch to RAMSES . By default the patch comes with the
RAMSES code whenever it is downloaded.
The Phantom of RAMSES user guide for galaxy simulations using Milgromian and Newtonian gravity
Nagesh, Banik, Thies, Kroupa, Famaey, Wittenburg, Parziale, Haslbauer
(Canadian Journal of Physics, 2021)
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