نتایج جستجو برای: scalar fields

تعداد نتایج: 284404  

Journal: :iranian journal of astronomy and astrophysic 0
neda amjadi astrophysics department, physics faculty, university of tabriz, tabriz, iran vahid abbasvand astrophysics department, physics faculty, university of tabriz, tabriz, iran d.m jassur astrophysics department, physics faculty, university of tabriz, tabriz, iran

in the current paper, we have studied the effect of dark energy on for-mation where dark energy exists in the background. for this purpose, we used both wmap9 and planck data to study how the radius changes with redshift in these mod-els. we used different data sets to fix the cosmological parameters to obtain a solution for a spherical region under collapse. the mechanism of structure formation f...

الهام بیگلر, , فرهنگ لران, ,

We study duality of field theories in (d+1) dimensional flat Euclidean space and (d+1) dimensional Euclidean AdS space for both scalar the and vector fields. In the case of the scalar theory, the injective map between conformally coupled massless scalars in two spaces is reviewed. It is shown that for vector fields the injective map exists only in four dimensions. Since Euclidean AdS space is e...

Marjan jafari

 Casimir entropy is an important aspect of casimir effect and at the nanoscale is visible. In this paper, we employ the path integral method to ‎obtain a‎ ‎general‎ relation for casimir entropy and ‎i‎nternal energy of arbitrary shaped objects in the presence of two, three and four dimension scalar fields and ‎the‎ electromagnetic field. For this purpose, using Lagrangian and based on a perturb...

In this paper, the effective field theory for the anisotropic inflationary universe in Weinberg's approach is studied. We consider the leading correction terms to the standard interactions in the anisotropic inflationary models. These consist of forth derivative of the fields, scalar field, gauge field and metric. Then, the scalar power spectrum is investigated in the presence of higher energy ...

Journal: :Journal of Mathematical Physics 1996

Journal: :Journal of High Energy Physics 2014

The problem of unbounded uniaxial chiral omega media in the presence of both static electric and magnetic point charges is investigated. For this purpose scalar electric and magnetic potentials in these media are introduced. Using these potentials, the corresponding electric and magnetic fields are determined. The similar problem of static electric and magnetic current sources with the goal of ...

Journal: :Modern Physics Letters A 2022

In this paper, we investigate the cosmological dynamics in a spatially flat Friedmann–Lemaître–Robertson–Walker geometry scalar-tensor and scalar-torsion theories where nonminimally coupled scalar field is complex field. We derive equations make use of dimensionless variables order to determine stationary points their stability properties. The physical properties are discussed while find that t...

Journal: :Theoretical and Mathematical Physics 2008

Journal: :Royal Society Open Science 2018

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