نتایج جستجو برای: Dark Energy

تعداد نتایج: 728839  

Journal: :iranian journal of astronomy and astrophysic 0
s. asadzadeh department of physics, university of kurdistan, pasdaran street, sanandaj, iran; m.s. khaledian department of physics, university of kurdistan, pasdaran street, sanandaj, iran; k. karami department of physics, university of kurdistan, pasdaran street, sanandaj, iran;

we investigate the growth of matter density perturbations as well as the generalized second law (gsl) of thermodynamics in the framework of f(r)-gravity. we consider a spatially flat frw universe filled with the pressureless matter and radiation which is enclosed by the dynamical apparent horizon with the hawking temperature. for some viable f(r) models containing the starobinsky, hu-sawicki, exp...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم 1387

چکیده ندارد.

D.M Jassur Neda Amjadi Vahid Abbasvand,

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...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه کردستان 1386

چکیده ندارد.

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...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بوعلی سینا - دانشکده علوم پایه 1387

چکیده ندارد.

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه کردستان - دانشکده علوم پایه 1386

چکیده ندارد.

2008
Varun Sahni

I briefly review our current understanding of dark matter and dark energy. The first part of this paper focusses on issues pertaining to dark matter including observational evidence for its existence, current constraints and the ‘abundance of substructure’ and ‘cuspy core’ issues which arise in CDM. I also briefly describe MOND. The second part of this review focusses on dark energy. In this pa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زنجان - دانشکده علوم پایه 1387

چکیده ندارد.

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