Results 101 to 110 of about 550,111 (273)
Stable bounce and inflation in non-local higher derivative cosmology [PDF]
, 2012 One of the greatest problems of primordial inflation is that the inflationary space-time is past-incomplete. This is mainly because Einstein's GR suffers from a space-like Big Bang singularity. It has recently been shown that ghost-free, non-local higher-
Tirthabir Biswas +3 more
semanticscholar +1 more source
Primordial black holes from the preheating instability in single-field inflation [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 After the end of inflation, the inflaton field oscillates around a local minimum of its potential and decays into ordinary matter. These oscillations trigger a resonant instability for cosmological perturbations with wavelengths that exit the Hubble ...
Jérôme Martin +2 more
semanticscholar +1 more source
Expected value, to a point: Moral decision‐making under background uncertainty
Noûs, EarlyView.Abstract Expected value maximization gives plausible guidance for moral decision‐making under uncertainty in many situations. But it has unappetizing implications in ‘Pascalian’ situations involving tiny probabilities of extreme outcomes. This paper shows, first, that under realistic levels of ‘background uncertainty’ about sources of value independent
Christian Tarsney
wiley +1 more source
On Extensions of the Starobinsky Model of Inflation
Physical Sciences Forum, 2023 We propose inflationary models that are one-parametric generalizations of the Starobinsky R+R2 model. Using the conformal transformation, we obtain scalar field potentials in the Einstein frame that are one-parametric generalizations of the potential for
Vsevolod Ivanov +3 more
doaj +1 more source
Scalar Field Condensate Baryogenesis Model in Different Inflationary Scenarios [PDF]
arXiv, 2020 We calculate the baryon asymmetry value generated in the Scalar Field Condensate (SCF) baryogenesis model obtained in several inflationary scenarios and different reheating models. We provide analysis of the baryon asymmetry value obtained for more than 70 sets of parameters of the SCF model and the following inflationary scenarios, namely: new ...
arxiv
Supergravity based inflation models: a review [PDF]
, 2011 In this review, we discuss inflation models based on supergravity. After explaining the difficulties in realizing inflation in the context of supergravity, we show how to evade such difficulties. Depending on types of inflation, we give concrete examples, particularly paying attention to chaotic inflation because the ongoing experiments like Planck ...
arxiv +1 more source
Late D-term Inflation and the Cosmological Moduli Problem in TeV Scale Strings [PDF]
JHEP 9909:012,1999, 1999 We show that a short period of late D-term inflation can solve the cosmological moduli (radion) problem of (asymmetric) inflation at the TeV scale. Late inflation happens after the large compact dimensions are stabilized which is crucial for obtaining the extremely small Hubble constant and inflaton mass required.
arxiv +1 more source
Non-singular Power-law and Assisted inflation in Loop Quantum Cosmology [PDF]
, 2012 We investigate the dynamics of single and multiple scalar fields with exponential potentials, leading to power-law and assisted inflation, in loop quantum cosmology.
Evan Ranken, Parampreet Singh
semanticscholar +1 more source
INFLATION AS AN ATTRACTOR IN SCALAR COSMOLOGY [PDF]
Modern Physics Letters A, 2013 We study an inflation mechanism based on attractor properties in cosmological evolutions of a spatially flat Friedmann–Robertson–Walker spacetime based on the Einstein-scalar field theory. We find a new way to get the Hamilton–Jacobi equation solving the field equations.
openaire +4 more sources
Lessons from the void: What Boltzmann brains teach
Analytic Philosophy, EarlyView.Abstract Some physical theories predict that almost all brains in the universe are Boltzmann brains, that is, short‐lived disembodied brains that are accidentally assembled as a result of thermodynamic or quantum fluctuations. Physicists and philosophers of physics widely regard this proliferation as unacceptable, and so take its prediction as a basis ...
Bradford Saad
wiley +1 more source