Erratum: Power spectrum of the primordial scalar field fluctuations in the warm inflation scenario [Phys. Rev. D 58, 103518 (1998)]

1999 ◽  
Vol 60 (8) ◽  
Author(s):  
Mauricio Bellini
Keyword(s):  
Scalar Field ◽  
Power Spectrum ◽  
Warm Inflation ◽  
Field Fluctuations ◽  
Inflation Scenario

scholarly journals SMOOTHED QUANTUM FLUCTUATIONS AND CMB OBSERVATIONS

2012 ◽  
Vol 21 (10) ◽  
pp. 1250080
Author(s):  
JAKUB MIELCZAREK ◽  
MICHAŁ KAMIONKA
Keyword(s):  
Scalar Field ◽  
Power Spectrum ◽  
Internal Structure ◽  
Planck Scale ◽  
Quantum Fluctuations ◽  
Gaussian Smoothing ◽  
Cosmic Inflation ◽  
Smoothing Factor ◽  
High Multipoles

In this paper, we investigate power spectrum of a smoothed scalar field. The smoothing leads to regularization of the UV divergences and can be related with the internal structure of the considered field or the space itself. We perform Gaussian smoothing to the quantum fluctuations generated during the phase of cosmic inflation. We study whether this effect can be probed observationally and conclude that the modifications of the power spectrum due to the smoothing on the Planck scale are negligible and far beyond the observational abilities. Subsequently, we investigate whether smoothing in any other form can be probed observationally. We introduce phenomenological smoothing factor e-k2σ2 to the inflationary spectrum and investigate its effects on the spectrum of CMB anisotropies and polarization. We show that smoothing can lead to suppression of high multipoles in the spectrum of the CMB. Based on seven years observations of WMAP satellite we indicate that the present scale of high multipoles suppression is constrained by σ < 3.19 Mpc (95% CL). This corresponds to the constraint σ < 100 μm at the end of inflation. Despite this value is far above the Planck scale, other processes of smoothing can be possibly studied with this constraint, as decoherence or diffusion of primordial perturbations.

Scalar field fluctuations in the early universe

1988 ◽  
Vol 303 (4) ◽  
pp. 713-727 ◽  
Author(s):  
K. Enqvist ◽  
K.W. Ng ◽  
K.A. Olive
Keyword(s):  
Scalar Field ◽  
Early Universe ◽  
Field Fluctuations

scholarly journals Primordial SdS universe from a 5D vacuum: scalar field fluctuations on Schwarzschild and Hubble horizons

2010 ◽  
Vol 2010 (11) ◽  
pp. 020-020 ◽  
Author(s):  
José Edgar Madriz Aguilar ◽  
Mauricio Bellini
Keyword(s):  
Scalar Field ◽  
Field Fluctuations

scholarly journals Power spectrum in the Chaplygin gas model: tachyonic, fluid and scalar field representations

2009 ◽  
Vol 42 (4) ◽  
pp. 839-849 ◽  
Author(s):  
Carlos Eduardo Magalhães Batista ◽  
Júlio Cesar Fabris ◽  
Masaaki Morita
Keyword(s):  
Scalar Field ◽  
Power Spectrum ◽  
Chaplygin Gas

Power-law plateau and inverse symmetric inflation

2018 ◽  
Vol 27 (08) ◽  
pp. 1850087 ◽  
Author(s):  
Abdul Jawad ◽  
Shahid Chaudhary
Keyword(s):  
Scalar Field ◽  
Power Spectrum ◽  
Spectral Index ◽  
Power Law ◽  
Field Model ◽  
Chaplygin Gas ◽  
Generalized Chaplygin Gas ◽  
Planck Data ◽  
Inflationary Parameters ◽  
Ratio Versus

Warm generalized Chaplygin gas inflation is being studied by assuming power-law plateau and inverse symmetric potentials with standard scalar field model. We consider strong dissipative regime with generalized dissipative coefficient and extract the various inflationary parameters such as scalar power spectrum, spectral index, tensor-to-scalar ratio and running of spectral index. It is found that both inflationary potentials favor the strong dissipative regime. Also, we construct the [Formula: see text]–[Formula: see text] (running of spectral index versus spectral index) and [Formula: see text]–[Formula: see text] (tensor-to-scalar ratio versus spectral index) planes and found that the trajectories of these planes favor WMAP 7 [Formula: see text] WMAP 9 and latest Planck data.

Effect of a primordial magnetic field on the inflaton decay process in a warm inflation scenario

2015 ◽  
Vol 336 (8-9) ◽  
pp. 805-809 ◽  
Author(s):  
M. Bastero-Gil ◽  
G. Piccinelli ◽  
A. Sanchez
Keyword(s):  
Magnetic Field ◽  
Decay Process ◽  
Warm Inflation ◽  
Primordial Magnetic Field ◽  
Inflation Scenario

scholarly journals Loop quantum cosmology-corrected Gauss–Bonnet singular cosmology

2018 ◽  
Vol 15 (04) ◽  
pp. 1850064 ◽  
Author(s):  
K. Kleidis ◽  
V. K. Oikonomou
Keyword(s):  
Power Spectrum ◽  
Classical Theory ◽  
Quantum Cosmology ◽  
Loop Quantum Cosmology ◽  
Leading Order ◽  
Type Iii ◽  
Type Iv ◽  
Inflation Scenario

In this work we investigate which Loop Quantum Cosmology (LQC)-corrected Gauss–Bonnet [Formula: see text] gravity can realize two singular cosmological scenarios, the intermediate inflation and the singular bounce scenarios. The intermediate inflation scenario has a Type III sudden singularity at [Formula: see text], while the singular bounce has a soft Type IV singularity. By using perturbative techniques, we find the holonomy-corrected [Formula: see text] gravities that generate at leading order the aforementioned cosmologies and we also argue that the effect of the holonomy corrections is minor to the power spectrum of the primordial curvature perturbations of the classical theory.

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