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Higher order corrections to asymptotic-de Sitter inflation

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Chinese Physics C 2017年第8期41卷 112-117页

作者： m.mohsenzadeh E.Yusofi Department of Physics Qom BranchIslamic Azad UniversityQomIran Department of Physics Ayatollah Amoli BranchIslamic Azad UniversityAmolMazandaranIrana School of Astronomy Institute for Research in Fundamental Sciences(IPM)P.O.Box 19395-5531TehranIran

Since trans-Planckian considerations can be associated with the re-definition of the initial vacuum, we investigate further the influence of trans-Planckian physics on the spectra produced by the initial quasi-de Sitter（d S） state during inflation. We use the asymptotic-d S mode to study the trans-Planckian correction of the power spectrum to the quasi-d S inflation. The obtained spectra consist of higher order corrections associated with the type of geometry and harmonic terms sensitive to the fluctuations of space-time（or gravitational waves） during *** an important result, the amplitude of the power spectrum is dependent on the choice of c, i.e. the type of spacetime in the period of inflation. Also, the results are always valid for any asymptotic d S space-time and particularly coincide with the conventional results for d S and flat space-time.

关键词： initial state trans-Planckian effects inflation

Inflation in Non-de Sitter Background with Coherent States

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Communications in Theoretical Physics 2016年第3期65卷 308-314页

作者： E.Yusofi m.mohsenzadeh m.R.Tanhayi Department of Physics Ayatollah Amoli BranchIslamic Azad University Department of Physics Qom BranchIslamic Azad University Department of Physics Islamic Azad UniversityCentral Tehran Branch

We use the excited coherent states built over the initial non-de Sitter modes,to study the modification of spectra of primordial scalar ***-de Sitter modes are actually the asymptotic solution of the inflaton field equation[*** Energy Phys.09（2014） 020].We build excited coherent states over the non-de Sitter modes and despite the Jack of interactions in the Lagrangian,we find a non-zero one-point *** is shown that the primordial non-Gaussianity resulting from excited-de Sitter modes depend both of time and background *** is very tiny of order（≤10^-24）,at the Planck initial fixed time that confirmed by resent observations for single field inflation but it grows in the present ***,our results at the leading order are similar to what obtained with general initial states and in the dS limit leads to standard results[***.1202（2012） 005].We will show that the non-dS modes and its resulting spectrum are more usable for far past time limit.

关键词： inflation initial states planck time background space-time

Large angular scale CmB anisotropy from an excited initial mode

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Chinese Physics C 2016年第7期40卷 85-89页

作者： A.So jasi m.mohsenzadeh E.Yusofi Department of Physics Rasht Branch Islamic Azad University Department of Physics Qom Branch Islamic Azad University Department of Physics Ayatollah Amoli Branch Islamic Azad University

According to inflationary cosmology, the CmB anisotropy gives an opportunity to test predictions of new physics hypotheses. The initial state of quantum fluctuations is one of the important options at high energy scale, as it can affect observables such as the CmB power spectrum. In this study a quasi-de Sitter inflationary background with approximate de Sitter mode function built over the Bunch-Davies mode is applied to investigate the scale-dependency of the CmB anisotropy. The recent Planck constraint on spectral index motivated us to examine the effect of a new excited mode function （instead of pure de Sitter mode） on the CmB anisotropy at large angular scales. In so doing, it is found that the angular scale-invariance in the CmB temperature fluctuations is broken and in the limit l 〈 200 a tiny deviation appears. Also, it is shown that the power spectrum of CmB anisotropy is dependent on a free parameter with mass dimension H 〈〈 m＊〈 mp and on the slow-roll parameter ε.

关键词： initial state power spectrum CmB anisotropy

THE IN VITRO ANTIBACTERIAL ACTIVITY OF SOmE IRANIAN ESSENTIAL OILS ON Bacillus cereus AND Staphylococcus aureus

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THE IN VITRO ANTIBACTERIAL ACTIVITY OF SOME IRANIAN ESSENTIA...