Dark matter -- particles or modified gravity?

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SUMMARY

The discussion centers on the debate surrounding dark matter, specifically the evidence supporting its particle-like nature versus modified gravity theories such as MOND (Modified Newtonian Dynamics). Key arguments favoring a particle origin include observations from the Bullet Cluster, which provide significant insights into dark matter's behavior. Additionally, the potential relevance of Mimetic Dark Matter is highlighted, suggesting ongoing research may yield new findings in this area.

PREREQUISITES
  • Understanding of dark matter theories, particularly particle physics and modified gravity.
  • Familiarity with MOND (Modified Newtonian Dynamics) and TeVeS (Tensor-Vector-Scalar gravity).
  • Knowledge of astrophysical phenomena, specifically the Bullet Cluster and its implications for dark matter.
  • Awareness of emerging theories like Mimetic Dark Matter and their significance in current research.
NEXT STEPS
  • Research the implications of the Bullet Cluster on dark matter theories.
  • Explore the principles of MOND and TeVeS in detail.
  • Investigate the latest findings on Mimetic Dark Matter from recent academic papers.
  • Study particle physics related to dark matter candidates, focusing on current experimental approaches.
USEFUL FOR

Astronomers, physicists, and researchers interested in cosmology, particularly those exploring the nature of dark matter and its alternatives.

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What is the evidence for dark matter being new particles as opposed to some modified form of gravity?
 
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Most of the evidence for Dark matter and all arguments against MOND suggest a particle-like origin. The list is too long to explain every point in detail here. Do you have more specific questions?
 
MOND/TeVeS is not the only alternative to real dark matter.

For example Mimetic Dark Matter may gain some echo in the next months
http://arxiv.org/abs/1308.5410
 

Thread 'Questioning the timescape model'

"Supernovae evidence for foundational change to cosmological models" https://arxiv.org/pdf/2412.15143 The paper claims: We compare the standard homogeneous cosmological model, i.e., spatially flat ΛCDM, and the timescape cosmology which invokes backreaction of inhomogeneities. Timescape, while statistically homogeneous and isotropic, departs from average Friedmann-Lemaître-Robertson-Walker evolution, and replaces dark energy by kinetic gravitational energy and its gradients, in explaining...
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