Structure formation in a Dirac-Milne universe: Comparison with the standard cosmological model

Abstract

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MOND-like behavior in the Dirac–Milne universe

“…Despite these tremendous differences in the initial timescales, the D-M universe, with only one adjustable parameter H 0 , presents several elements of concordance: its age, equal to 1/H 0 , is almost equal to the age of the ΛCDM universe for H 0 ≈ 70 km s −1 Mpc −1 , while the H(z) dependence of cosmic chronometers is nicely reproduced in coasting universes (Melia & Maier 2013), along with primordial nucleosynthesis 1 and the SNIa luminosity distance (Sethi et al 1999;Chodorowski 2005;Benoit-Lévy & Chardin 2012). Also, its non linear structure formation mechanism appears to reproduce the main features of the matter power spectrum starting from a single scale of matter-antimatter domains at decoupling (Manfredi et al 2018(Manfredi et al , 2020. In addition, the D-M cosmology does not suffer from the horizon problem (Benoit-Lévy & Chardin 2012) and therefore does not require inflation.…”

“…It is fundamental to note that although existing in nature, the Dirac particle-hole system has no Newtonian expression, even when the three Newtonian mass parameters (inertial, gravitational active, and gravitational passive) are used (Manfredi et al 2018). On the other hand, as studied in Manfredi et al (2018Manfredi et al ( , 2020, the gravitational sector of matter and antimatter in the D-M universe can be expressed with two separate gravitational potentials, using the following coupled Poisson equations:…”

“…and g − ≡ −∇φ − (5) exerted on a particle and its antiparticle are opposite in the "Newtonian" regime (i.e., when the gravitational field created by matter is much larger than the contribution of antimatter, which can then be neglected), as the total force on the bound (+m, −m) system is zero (Manfredi et al 2018(Manfredi et al , 2020.…”

“…In Sect. 4, we present preliminary results of velocity distributions as a function of mass using a modified version of the RAMSES 3D simulation code incorporating the gravitational behavior of the D-M universe, as described in Manfredi et al (2018) and Manfredi et al (2020). In Sect.…”

A Vacuum of Quantum Gravity That is Ether.

“…Namely, a stage preceding the acceleration should be a Milne's-like, i.e., linear in a cosmic time. The Milne's-like universes have been much discussed again recently [33][34][35][36][37][38].…”