#early universe
16 papers · 1 filter
Growth, geometry, and early-universe split of the matter density parameter
Felicitas Keil, Isaac Tutusaus, Alain Blanchard
The paper separates the present‑day matter density parameter Ωₘ into geometric, growth, and early‑universe contributions using DES, Planck, DESI BAO, Pantheon+ supernovae, and RSD…
Domain walls through different cosmologies
I. Dankovsky, D. Gorbunov, S. Ramazanov +1
The paper uses lattice simulations to study how domain wall networks evolve under various early‑universe expansion histories, showing that the particle horizon largely determines w…
Gravitational Waves as a Source of Large-Scale White Noise: New Constraints
Gabriela Barenboim, Albert Stebbins
The paper shows how a stochastic gravitational‑wave background can generate large‑scale white noise in the cosmic density field and uses the lack of observed white noise to place l…
Seesaw Cosmology
Nicolás Bernal, Chee Sheng Fong, Ãscar Zapata
The paper investigates a reheating scenario where the inflaton decays into right‑handed neutrinos that generate light neutrino masses via the type‑I seesaw, leading to a nonstandar…
Non-Minimally Coupled Chain Inflation at High Scales
Miguel Barroso Varela, Orfeu Bertolami, Katherine Freese +1
The paper investigates how a non‑minimal coupling between a scalar field and gravity modifies chain inflation, affecting tunneling rates, the scalar spectral index, and producing a…
The art of simulating the early Universe. Part III: Scalar-Gauge-Fluid Dynamics
Daniel G. Figueroa, Kenneth Marschall, Antonino S. Midiri +1
The paper reviews lattice-based methods for simulating fluid dynamics in the early Universe, including how fluids couple to scalar and gauge fields and how to set up initial condit…