Results 51 to 60 of about 32,224 (210)

Entropic Inflation in Presence of Scalar Field

Universe, 2023
In spirit of the recently proposed four-parameter generalized entropy of apparent horizon, we investigate inflationary cosmology where the matter field inside of the horizon is dominated by a scalar field with a power law potential (i.e., the form of ϕn ...
Sergei D. Odintsov, Simone D’Onofrio, Tanmoy Paul   +2 more
doaj   +1 more source

The String Theory Landscape

Universe, 2019
String/M theory is formulated in 10 and 11 space-time dimensions; in order to describe our universe, we must postulate that six or seven of the spatial dimensions form a small compact manifold. In 1985, Candelas et al.
Michael R. Douglas
doaj   +1 more source

Hurdles for Recent Measures in Eternal Inflation [PDF]

, 2006
In recent literature on eternal inflation, a number of measures have been introduced which attempt to assign probabilities to different pocket universes by counting the number of each type of pocket according to a specific procedure.
A. Aguirre, Anthony Aguirre, Matthew C Johnson, Steven Gratton   +3 more
core   +2 more sources

Exit from inflation with a first-order phase transition and a gravitational wave blast

Physics Letters B, 2015
In double-field inflation, which exploits two scalar fields, one of the fields rolls slowly during inflation whereas the other field is trapped in a meta-stable vacuum.
Amjad Ashoorioon
doaj   +1 more source

A local Wheeler-DeWitt measure for the string landscape

Nuclear Physics B, 2023
According to the ‘Cosmological Central Dogma’, de Sitter space can be viewed as a quantum mechanical system with a finite number of degrees of freedom, set by the horizon area.
Bjoern Friedrich, Arthur Hebecker, Manfred Salmhofer, Jonah Cedric Strauß, Johannes Walcher   +4 more
doaj   +1 more source

ETERNAL CHAOTIC INFLATION [PDF]

Modern Physics Letters A, 1986
It is shown that the evolution of the universe in the chaotic inflation scenario has no end and may have no beginning. According to this scenario, the universe consists of an exponentially large number of different mini-universes inside which all possible metastable vacuum states and all possible types of compactifications are realized.
openaire   +1 more source

Inflationary resolution of the initial singularity

Physics Letters B
The inflationary paradigm has transformed our understanding of the early universe; yet most inflationary models are considered geodesically past-incomplete, suggesting a beginning of time or a primordial Big Bang singularity. The Borde-Guth-Vilenkin (BGV)
Damien A. Easson, Joseph E. Lesnefsky
doaj   +1 more source

Soft de Sitter Effective Theory

Journal of High Energy Physics, 2020
Calculating the quantum evolution of a de Sitter universe on superhorizon scales is notoriously difficult. To address this challenge, we introduce the Soft de Sitter Effective Theory (SdSET).
Timothy Cohen, Daniel Green
doaj   +1 more source

Swampland constraints on no-boundary quantum cosmology

Journal of High Energy Physics, 2020
The Hartle-Hawking no-boundary proposal describes the quantum creation of the universe. To have a non-negligible probability to obtain a classical expanding universe, eternal inflation is required, which is severely constrained by Swampland conjectures ...
Hiroki Matsui, Takahiro Terada
doaj   +1 more source

Myth and politics: behavioral archetypes in ancient Iran and persistence in power and politics [PDF]

مجله مطالعات ایرانی, 2020
1. Introduction Our minds are shaped by human history, and the thoughts of our forefathers certainly exercise undeniable influence on its structure. On this ground, when carefully analyzing our mental processes, we might need to examine how other people ...
Fateh Moradi
doaj   +1 more source