15691

14023

كارشناسي ارشد

ذرات بنيادي و نظريه ميدان ها

اصفهان : دانشگاه صنعتي اصفهان

1398

نه، 138ص. : مصور، جدول، نمودار

بهروز ميرزا

احمد شيرزاد

سروش شاكري، فرهنگ لران

1399/05/14

كتابنامه

فيزيك

فيزيك

1399/05/15

2625554

Thermodynamic stability conditions in the presence of dark energy and investigation of some models without dark energy fateme sadeghi fatemeh sadeghi@ph iut ac ir com January 19 2020 Department of Physics Isfahan University of Technology Isfahan 84156 83111 Iran University Code IUT 77142 Degree M S c Language Farsi supervisor Dr Behrouz Mirza b mirza@cc iut ac ir Abstract Today the accelerated expansion of the universe is a controversial subject and the theories put forward to explain it vary widely Some of these theories involve the correction of Einstein s field equations and in others an unknown component known as dark energy responsible for accelerating expansion of the universe In the early parts of this thesis we have introduced a method called Applied cosmography and we have examined some models of cosmology without dark energy Then we introduce the dynamical systems method and apply it to two different models one in which dark energy is present and in other the dark energy is absent In the final sections of this thesis we study the thermodynamic laws of dark energy with the constant equation of state parameter and with variable equation of state parameter and obtain the thermodynamic stability conditions of the universe for each of these states separately Finally we examine the possibility of thermodynamic stability in future singularities Keywords Applied Cosmography Method Friedmann Equations Dynamical System Ther modynamic Stability

بهروز ميرزا

احمد شيرزاد

سروش شاكري، فرهنگ لران