Effective Dark Matter Halo Catalog in f(R) Gravity.

Area of Science:

• Cosmology
• Astrophysics
• Modified Gravity

Background:

• The standard cosmological model, Lambda Cold Dark Matter (ΛCDM), successfully explains large-scale structures.
• f(R) gravity offers an alternative to dark energy, modifying gravitational effects on cosmic structure formation.
• Directly simulating f(R) gravity is computationally intensive, posing challenges for studying galaxy formation within these models.

Purpose of the Study:

• To develop an effective dark matter halo catalog for f(R) gravity.
• To compare the dynamical properties of halos in f(R) gravity with those in ΛCDM.
• To provide a simplified tool for studying galaxy formation and baryonic physics in f(R) cosmologies.

Main Methods:

• Utilizing a suite of high-resolution N-body simulations.
• Constructing an effective dark matter halo catalog based on the effective density field in f(R) gravity.
• Analyzing dynamical properties including density distribution, velocity dispersion, specific angular momentum, and spin.

Main Results:

• The dynamical properties of halos in the effective f(R) gravity catalog closely mimic those in the ΛCDM model.
• f(R) gravity cosmologies can be effectively represented as ΛCDM models when using the effective halo catalog.
• The effective catalog demonstrates strong similarities in halo density, velocity dispersion, and angular momentum distributions.

Conclusions:

• The effective dark matter halo catalog provides a computationally efficient method for studying f(R) gravity.
• This approach facilitates research into baryonic physics and galaxy formation within modified gravity scenarios.
• The effective catalog bridges the gap between complex f(R) simulations and established ΛCDM analysis techniques.