INFLATION AND ACCELERATION OF UNIVERSE FROM NONMINIMAL COUPLING GRAVITY AND NONLINEAR ELECTRODYNAMICS
The inflationary universe is proposed to explain several problems in the conventional Big Bang theory, such as horizon, monopole, and flatness problems. There have been many models of inflation proposed, but until recently no one knew how inflation actually happened in the early universe. In addi...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/79586 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The inflationary universe is proposed to explain several problems in the conventional
Big Bang theory, such as horizon, monopole, and flatness problems. There have been
many models of inflation proposed, but until recently no one knew how inflation actually
happened in the early universe. In addition, the results of observations of Type Ia
Supernovae (SN Ia) show that the expansion of the universe is accelerating. The cause
of this accelerated expansion of the universe is still unknown for certain, it is one of
the greatest mysteries in modern cosmology. In this research we propose a model of
gravity that is nonminimally coupled with nonlinear electrodynamics to find a solution
for an inflationary universe in early-time. We also consider the cosmological constant
(?) in Einstein’s equations to obtain a solution for the acceleration of the universe in
late-time. This research begins by considering the action integral of the model. Then
the action is varied with respect to the metric to obtain the dynamics equations of the
universe. We study the evolution of the universe by finding the solutions to dynamical
equations. From the evolution of the scale factor a(t) equation, it is found that the scale
factor a(t) only approach 0 when t ? ??. This model describes the inflation of the
universe with a scale factor that expands exponentially in early-time. Then from the
evolution of the equation of state parameter w, it is found that the value of w = ?2/3 in
late-time, this fulfills the conditions for a universe experiencing accelerated expansion
in late-time.
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