Publications (16)
Has JWST already falsified dark-matter-driven galaxy formation?
Moritz Haslbauer, Pavel Kroupa, Akram Hasani Zonoozi +1
The James Webb Space Telescope (JWST) discovered several luminous high-redshift galaxy candidates with stellar masses of at photometric red…
Fast galaxy bars continue to challenge standard cosmology
Mahmood Roshan, Neda Ghafourian, Tahere Kashfi +5
Many observed disc galaxies harbour a central bar. In the standard cosmological paradigm, galactic bars should be slowed down by dynamical friction from the dark matter halo. This…
On the absence of backsplash analogues to NGC 3109 in the CDM framework
Indranil Banik, Moritz Haslbauer, Marcel S. Pawlowski +2
The dwarf galaxy NGC 3109 is receding 105 km/s faster than expected in a CDM timing argument analysis of the Local Group and external galaxy groups within 8 Mpc (Banik \& Zhao…
The KBC void and Hubble tension contradict CDM on a Gpc scale Milgromian dynamics as a possible solution
Moritz Haslbauer, Indranil Banik, Pavel Kroupa
The KBC void is a local underdensity with the observed relative density contrast between 40 and 300 Mpc around the Local Group. If mass is…
The Star Formation History and Dynamics of the Ultra-diffuse Galaxy Dragonfly 44 in MOND and MOG
Hosein Haghi, Vahid Amiri, Akram Hasani Zonoozi +3
The observed line-of-sight velocity dispersion of the ultra diffuse galaxy Dragonfly 44 (DF44) requires a Newtonian dynamical mass-to-light ratio of $M_{dyn}/L_I=26^{+7}…
The many tensions with dark-matter based models and implications on the nature of the Universe
Pavel Kroupa, Eda Gjergo, Elena Asencio +6
(Abridged) Fundamental tensions between observations and dark-matter based cosmological models have emerged. This updated review has two purposes: to explore new tensions that have…
The Magellanic Clouds are very rare in the IllustrisTNG simulations
Moritz Haslbauer, Indranil Banik, Pavel Kroupa +2
The Large and Small Magellanic Cloud (LMC and SMC) form the closest interacting galactic system to the Milky Way, therewith providing a laboratory to test cosmological models in th…
A simultaneous solution to the Hubble tension and observed bulk flow within 250 Mpc
Sergij Mazurenko, Indranil Banik, Pavel Kroupa +1
The cold dark matter (CDM) standard cosmological model is in severe tension with several cosmological observations. Foremost is the Hubble tension, which exceeds con…
The formation of early-type galaxies through monolithic collapse of gas clouds in Milgromian gravity
Robin Eappen, Pavel Kroupa, Nils Wittenburg +2
Studies of stellar populations in early-type galaxies (ETGs) show that the more massive galaxies form earlier and have a shorter star formation history (SFH). In this study, we inv…
The High Fraction of Thin Disk Galaxies Continues to Challenge ÎCDM Cosmology
Moritz Haslbauer, Indranil Banik, Pavel Kroupa +2
Any viable cosmological framework has to match the observed proportion of early- and late-type galaxies. In this contribution, we focus on the distribution of galaxy morphological…
The cosmological star formation history from the Local Cosmological Volume of galaxies and constraints on the matter homogeneity
Moritz Haslbauer, Pavel Kroupa, Tereza Jerabkova
The Lilly-Madau plot is commonly interpreted as the history of the cosmic star formation of the Universe by showing the co-moving star formation rate density (SFRD) over cosmic tim…
The Phantom of RAMSES user guide for galaxy simulations using Milgromian and Newtonian gravity
Srikanth T. Nagesh, Indranil Banik, Ingo Thies +5
This document describes the general process of setting up, running, and analysing disc galaxy simulations using the freely available program Phantom of RAMSES (PoR). This implement…
Constraints on the star formation histories of galaxies in the Local Cosmological Volume
Pavel Kroupa, Moritz Haslbauer, Indranil Banik +2
The majority of galaxies with current star-formation rates (SFRs), SFRo >= 10^-3 Msun/yr, in the Local Cosmological Volume where observations should be reliable, have the property…
The effect of the environment-dependent stellar initial mass function on the photometric properties of star-forming galaxies
Moritz Haslbauer, Zhiqiang Yan, Tereza Jerabkova +3
(Abridged) Observational estimates of galaxy properties rely on the inherent galaxy-wide initial mass function (gwIMF), which systematically varies with the global SFR and metallic…
The ultra-diffuse dwarf galaxies NGC 1052-DF2 and 1052-DF4 are in conflict with standard cosmology
Moritz Haslbauer, Indranil Banik, Pavel Kroupa +1
Recently van Dokkum et al. (2018b) reported that the galaxy NGC 1052-DF2 (DF2) lacks dark matter if located at Mpc from Earth. In contrast, DF2 is a dark-matter-dominated dwar…
Galaxies lacking dark matter in the Illustris simulation
Moritz Haslbauer, Joerg Dabringhausen, Pavel Kroupa +2
(Abridged) Any viable cosmological model in which galaxies interact predicts the existence of primordial and tidal dwarf galaxies (TDGs). In particular, in the standard model of co…