Results 51 to 60 of about 1,005 (182)
A new mechanism for freezing extra dimensions with higher-order curvature terms
Physics Letters B, 2020 We construct a model of higher dimensional cosmology in which extra dimensions are frozen by virtue of the cubic-order Lovelock gravity throughout the cosmic history from inflation to the present with radiation and matter-dominated regimes in between.
Hiroaki W.H. Tahara +2 more
doaj +1 more source
Cosmic microwave background bispectrum and inflation [PDF]
Physical Review D, 2000 We derive an expression for the non-Gaussian cosmic-microwave-background (CMB) statistic $I_l^3$ defined recently by Ferreira, Magueijo, and G rski in terms of the slow-roll-inflation parameters $ $ and $ $. This result shows that a nonzero value of $I_l^3$ in COBE would rule out single-field slow-roll inflation.
Wang, Limin, Kamionkowski, Marc
openaire +3 more sources
A New Hilbert's Hotel Argument Against Past‐Eternalism
Analytic Philosophy, EarlyView.ABSTRACT This paper offers a new formulation of the “Hilbert's Hotel Argument” (HHA) which is superior to existing formulations because it (1) demonstrates that HH is logically impossible in the concrete world, (2) takes into account the need to consider the assumptions of HHA, and (3) offers a reply to an important objection concerning the validity of
Andrew Ter Ern Loke, Eli Haitov
wiley +1 more source
Insights into gravitinos abundance, cosmic strings and stochastic gravitational wave background
European Physical Journal C: Particles and FieldsIn this paper, we investigate D-term inflation within the framework of supergravity, employing the minimal Kähler potential. Following previous studies that revealed that this model can overcome the $$\eta $$ η -problem found in F-term models, we explore
K. El Bourakadi +5 more
doaj +1 more source
Cosmic Inflation at the crossroads
Journal of Cosmology and Astroparticle PhysicsAbstract The capability of Cosmic Inflation to explain the latest Cosmic Microwave Background and Baryonic Acoustic Oscillation data is assessed by performing Bayesian model comparison within the landscape of nearly three-hundred models of single-field slow-roll inflation. We present the first Bayesian data analysis based on the
Martin, Jerome +2 more
openaire +3 more sources
Inflation and the Cosmic Microwave Background [PDF]
Astrophysics and Space Science, 1998 7 pages LaTeX file, with two figures incorporated using epsf.
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Fitting Cosmic Microwave Background Data with Cosmic Strings and Inflation [PDF]
Physical Review Letters, 2008 We perform a multiparameter likelihood analysis to compare measurements of the cosmic microwave background (CMB) power spectra with predictions from models involving cosmic strings. Adding strings to the standard case of a primordial spectrum with power-law tilt ns, we find a 2sigma detection of strings: f10=0.11+/-0.05, where f10 is the fractional ...
Neil, Bevis +3 more
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A Hyporeflective Response to the Absurd
Ratio, EarlyView.ABSTRACT If life is absurd in that we cannot help but desire the unattainable, then there is prima facie reason to lament the absurd whenever we are confronted with it. This is an intuitive idea: it is fitting to be disappointed by what is essentially disappointing.
Thom Hamer
wiley +1 more source
Unified emergence of energy scales and cosmic inflation
Journal of High Energy Physics, 2021 In the quest for unification of the Standard Model with gravity, classical scale invariance can be utilized to dynamically generate the Planck mass M Pl.
Jisuke Kubo +5 more
doaj +1 more source
Experimental Physiology, EarlyView.Abstract Central artery stiffening increases the haemodynamic pulsations transmitted downstream towards target organs, including the brain. While recent evidence suggests that long duration spaceflight is associated with reduced common carotid artery (CCA) distensibility, cerebrovascular pulsatility has not been extensively characterized in astronauts.
Roxanne Fournier +5 more
wiley +1 more source