Results 111 to 120 of about 180,985 (262)

Trans-Planckian footprints in inflationary cosmology

Physics Letters B, 2004
We consider a minimum uncertainty vacuum choice at a fixed energy scale Lambda as an effective description of trans-Planckian physics, and discuss its implications for the linear perturbations of a massless scalar field in power-law inflationary models.
ALBERGHI, GIAN LUIGI, CASADIO, ROBERTO, TRONCONI, ALESSANDRO   +2 more
openaire   +2 more sources

Non-commutativity in modified loop cosmology

European Physical Journal C: Particles and Fields
In this study, we explore the pre-inflationary dynamics of the universe using a non-commutative extension of the mLQC-I framework. By incorporating a scalar field potential, we show that key features of Loop Quantum Cosmology (LQC), such as the quantum ...
Abolhassan Mohammadi
doaj   +1 more source

Inflationary Cosmology

, 2002
The big bang model and the history of the early universe according to the grand unified theories are introduced. The shortcomings of big bang are discussed together with their resolution by inflationary cosmology. Inflation, the subsequent oscillation and decay of the inflaton, and the resulting "reheating" of the universe are studied.
openaire   +2 more sources

Approximate reconstruction of inflationary potential with ACT observations

Physics Letters B
The Atacama Cosmology Telescope (ACT) has recently reported updated measurements of the scalar spectral index ns, revealing a tension with the predictions of many conventional inflationary models. In this work, we adopt a parameterization of the spectral
Zhu Yi, Xingzhi Wang, Qing Gao, Yungui Gong   +3 more
doaj   +1 more source

Constraining barrow entropy-based cosmology with power-law inflation. [PDF]

Eur Phys J C Part Fields, 2023
Luciano GG.
europepmc   +1 more source

Stability Properties of Geometrothermodynamic Cosmological Models. [PDF]

Entropy (Basel), 2023
Beissen N, Abishev M, Khassanov M, Aitassov T, Mamatova S, Toktarbay S.   +5 more
europepmc   +1 more source

WKB approximation for inflationary cosmological perturbations [PDF]

, 2003
Jérôme Martin, Dominik J. Schwarz
openalex   +1 more source

Time evolution of the equation of state during perturbative reheating and its impact on the inflationary tensor perturbation spectrum

Nuclear Physics B
The spectrum of inflationary tensor perturbations is one of the very few available probes of the post-inflationary reheating epoch, and it is strongly influenced by the Universe's equation of state during this period.
Avirup Ghosh, Deep Ghosh
doaj   +1 more source

Preinflationary Dynamics of Power-Law Potential in Loop Quantum Cosmology †

Universe, 2018
In this article, I mainly discuss the dynamics of the pre-inflationary Universe for the potential V ( ϕ ) ∝ ϕ n with n = 5 / 3 in the context of loop quantum cosmology, in which the big bang singularity is resolved by a non ...
M. Shahalam
doaj   +1 more source

Beyond the Simplest Inflationary Cosmological Models [PDF]

, 1998
Alexei A. Starobinsky
openalex   +1 more source