We mainly focus on the idea that the dynamics of the whole universe may be understood by making use of torsion [Formula: see text] and curvature [Formula: see text] at the same time. The [Formula: see text]-gravity can be considered as a fundamental gravitational theory describing the evolution of the universe. The model can produce the unification of the general relativity (GR), teleparallel gravity (TPG), [Formula: see text]-gravity and [Formula: see text]-gravity theories. For this purpose, the corresponding Lagrangian density is written in terms of an arbitrary function of the torsion and curvature scalars. Furthermore, we use the absence/existence puzzle of relativistic neutron stars and thermodynamical laws as constraining tools for the new proposal.
The teleparallel alternative of general relativity which is based on torsion instead of curvature is considered as the gravitational sector to explore the dark universe. Inspired from the well-known Brans–Dicke gravity, here, we introduce a new proposal for the galactic dark energy effect. The new model includes a scalar field with self-interacting potential and a non-minimal coupling between the gravity and scalar field. Additionally, we analyze the idea via the Noether symmetry approach and thermodynamics.
In order to evaluate energy and momentum components associated with two different black hole models, i.e. the electric and magnetic black holes, we use the Møller energy-momentum prescriptions both in Einstein's theory of general relativity and the teleparallel gravity. We obtain the same energy and momentum distributions in both of these different gravitation theories. The energy distribution of the electric black hole depends on the mass M and the magnetic black hole energy distribution depends on the mass M and charge Q. In the process, we notice that (a) the energy obtained in teleparallel gravity is also independent of the teleparallel dimensionless coupling parameter, which means that it is valid not only in teleparallel equivalent of general relativity but also in any teleparallel model, (b) our results also sustains the importance of the energy-momentum definitions in the evaluation of the energy distribution of a given spacetime, and (c) the results obtained support the viewpoint of Lessner that the Møller energy-momentum complex is a powerful concept of energy and momentum.
Öz: Kütleçekim dalgalarının varlığı Haziran 1916'da A. Einstein tarafından yazılan bir makalede öngörülmüştür. Söz konusu dalgalar ivmelenmiş kütleli cisimlerin sebep olduğu uzay-zaman eğriliğindeki tedirginmelerdir. 1960'lardan itibaren, bilim insanları bu dalgaları gözlemleyebilmek için çeşitli teknikler geliştirmişlerdir. Öngörüde bulunduktan yaklaşık 100 yıl geçmişken; 2015 yılının 14 Eylül günü Lazer Girişimölçerli Kütleçekim Dalga Gözlemevlerinin iki detektörü, eşzamanlı olarak bir enine kütleçekim dalga sinyali ölçmüşlerdir. Bir asırı bulan teorik ve teknolojik çalışmalar, özellikle Lazer Girişimölçerli detektörlü gözlemevlerinin bu başarısı bu derlemenin konusudur. Çalışmamızda ayrıca kütleçekim dalgalarının olası kaynaklarından ve bu dalgaları ölçmek için geliştirilen tekniklerden bahsedeceğiz. Bu teknikler evreni araştırmak için yeni bir pencere ve astronomik gözlemler için yeni bir çağın başlangıcı olmuştur.
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