Warm inflation and WMAP9

2017 ◽  
Vol 15 (01) ◽  
pp. 1850010 ◽  
Author(s):  
S. Davood Sadatian
Keyword(s):  
Observational Data ◽  
Warm Inflation ◽  
Inflation Model

A warm inflation model, drawn upon the vector cosmology, was applied in the present work to calculate cosmological fluctuations. Moreover, parameters of the model were constrained and compared using the latest observational data such as Planck and WMAP9.

scholarly journals Warm Inflation with Nonminimal Derivative Coupling

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Kourosh Nozari ◽  
M. Shoukrani ◽  
N. Rashidi
Keyword(s):  
Scalar Field ◽  
Observational Data ◽  
Kinetic Term ◽  
Model Parameters ◽  
Detailed Calculation ◽  
Data Set ◽  
Derivative Coupling ◽  
Warm Inflation ◽  
Inflation Model ◽  
Planck Satellite

We study the effects of the nonminimal derivative coupling on the dissipative dynamics of the warm inflation where the scalar field is nonminimally coupled to gravity via its kinetic term. We present a detailed calculation of the cosmological perturbations in this setup. We use the recent observational data from the joint data set of WMAP9 + BAO +H0and also the Planck satellite data to constrain our model parameters for natural and chaotic inflation potentials. We study also the levels of non-Gaussianity in this warm inflation model and we confront the result with recent observational data from the Planck satellite.

scholarly journals Intermediate class of warm pseudoscalar inflation

2021 ◽  
Vol 81 (6) ◽  
Author(s):  
Saeid Ebrahimi ◽  
Vahid Kamali ◽  
Asma Alaei
Keyword(s):  
Phase Space ◽  
Observational Data ◽  
Accelerated Expansion ◽  
Limited Area ◽  
Cold Model ◽  
Inflation Model ◽  
Dissipation Parameter ◽  
Expansion Of The Universe ◽  
Intermediate Solution ◽  
The Universe

AbstractHigh dissipative regime of warm pseudoscalar inflation model (Kamali in Phys Rev D 100:043520, arXiv:1901.01897 [gr-qc], 2019) with an approximately constant value of dissipation parameter Q is studied. Intermediate solution of the scale-factor related to the accelerated expansion of the Universe which is rolled out by observational data in the context of standard (cold) model of inflation is used. There is a region of free parameters phase-space of the model which is interestingly compatible with recent observational data. It is discussed that the model is also compatible with the swampland criteria in a broad range of parameters phase-space and TCC in a limited area of parameters.

scholarly journals NON-MINIMAL INFLATION ON THE RANDALL–SUNDRUM II BRANE WITH INDUCED GRAVITY

2009 ◽  
Vol 24 (39) ◽  
pp. 3205-3217 ◽  
Author(s):  
KOUROSH NOZARI ◽  
M. SHOUKRANI
Keyword(s):  
Scalar Curvature ◽  
Observational Data ◽  
Recent Observation ◽  
Model Parameters ◽  
Minimal Coupling ◽  
Induced Gravity ◽  
Inflaton Field ◽  
Inflation Model ◽  
Braneworld Model

We study an inflation model that inflaton field is non-minimally coupled to the scalar curvature on the Randall–Sundrum (RS) II brane. We investigate the effects of the non-minimal coupling on the inflationary dynamics of this braneworld model. Our study shows that the number of e-folds decreases by increasing the value of the conformal coupling. We compare our model parameters with the minimal case and also with recent observational data. In comparison with recent observation, we obtain a constraint on the values that conformal coupling attains.

scholarly journals A note on low energy effective theory of chromo-natural inflation in the light of BICEP2 results

2015 ◽  
Vol 30 (11) ◽  
pp. 1550040 ◽  
Author(s):  
Anindita Bhattacharjee ◽  
Atri Deshamukhya ◽  
Sudhakar Panda
Keyword(s):  
Experimental Data ◽  
Recent Result ◽  
Observational Data ◽  
Parameter Space ◽  
Low Energy ◽  
The Other ◽  
Effective Theory ◽  
Inflation Model ◽  
Upper Limit ◽  
Inflationary Models

Recent result of BICEP2, revealing a larger value of tensor to scalar ratio (r), has opened up new investigations of the inflationary models to fit the experimental data. The experiment needs to reconfirm the results, specifically the consistency between Planck and BICEP2. On the other hand, the combined analysis of Planck and BICEP2, including the dust polarization uncertainty, brings down the upper limit on r. In this paper, we re-examine the low energy effective theory of chromo-natural inflation model and its generalization in view of such observational data. We find that the parameter space of the model admits a large value of r as well as other cosmological observables consistent with data.

Current status of special planetary and lunar theories and ephemerides

1966 ◽  
Vol 25 ◽  
pp. 266-267
Author(s):  
R. L. Duncombe
Keyword(s):  
Observational Data ◽  
Current Status ◽  
Numerical Errors

An examination of some specialized lunar and planetary ephemerides has revealed inconsistencies in the adopted planetary masses, the presence of non-gravitational terms, and some outright numerical errors. They should be considered of temporary usefulness only, subject to subsequent amendment as required for the interpretation of observational data.

July 11, 1991 Eclipse Corona Photometry by the Results of Electropolarimetric and CCD-Matrix Observations

1994 ◽  
Vol 144 ◽  
pp. 567-569
Author(s):  
V. Kulidzanishvili ◽  
D. Georgobiani
Keyword(s):  
Solar Corona ◽  
Observational Data ◽  
Solar Limb ◽  
Ccd Matrix

AbstractThe observational data of July 11, 1991 eclipse solar corona obtained by both electropolarimeter (EP) and CCD-matrix were processed. Using these data, the solar corona photometry was carried out. The results of EP data are compared with the ones of CCD data. It must be noted here that the CCD data give us only characteristics of the inner corona, while the EP data show the features of both the inner and middle corona up to 4R⊙. Standard flattening indexϵis evaluated from both data. The dependence of the flattening index on the distance from the solar limb is investigated. The isophotes in Na and Ca lines are plotted. Based on these data some ideas and conclusions on the type of the solar corona are presented.

On The Radii of Ap Stars

1976 ◽  
Vol 32 ◽  
pp. 49-55 ◽  
Author(s):  
F.A. Catalano ◽  
G. Strazzulla
Keyword(s):  
Observational Data ◽  
Line Width ◽  
Main Sequence ◽  
Main Sequence Stars ◽  
Ap Stars

SummaryFrom the analysis of the observational data of about 100 Ap stars, the radii have been computed under the assumption that Ap are main sequence stars. Radii range from 1.4 to 4.9 solar units. These values are all compatible with the Deutsch's period versus line-width relation.

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