Evolution of Compact Stars and Dark Dynamical Variables

This work is aimed to explore the dark dynamical effects of $f(R,T)$ modified gravity theory on the dynamics of compact celestial star. We have taken the interior geometry as spherical star which is filled with imperfect fluid distribution. The modified field equations are explored by taking a particular form of $f(R,T)$ model, i.e., $f(R,T)=f_1(R)+f_2(R)f_3(T)$. These equations are then utilized to formulate the well-known structure scalars under the dark dynamical effects of this higher order gravity theory. Also, the evolution equations for expansion and shear are formulated with the help of these scalar variables. Further, all this analysis have been made under the condition of constant $R$ and $T$. We found a crucial significance of dark source terms and dynamical variables on the evolution and density inhomogeneity of compact objects.Comment: 18 pages, 4 figures, version accepted for publication in European Physical Journal

Influence of f(R)f(R) Models on the Existence of Anisotropic Self-Gravitating Systems

This paper aims to explore some realistic configurations of anisotropic spherical structures in the background of metric $f(R)$ gravity, where $R$ is the Ricci scalar. The solutions obtained by Krori and Barua are used to examine the nature of particular compact stars with three different modified gravity models. The behavior of material variables is analyzed through plots and the physical viability of compact stars is investigated through energy conditions. We also discuss the behavior of different forces, equation of state parameter, measure of anisotropy and Tolman-Oppenheimer-Volkoff equation in the modeling of stellar structures. The comparison from our graphical representations may provide evidences for the realistic and viable $f(R)$ gravity models at both theoretical and astrophysical scale.Comment: 23 pages, 13 figures, version accepted for publication in European Physical Journal

Existence of Compact Structures in f(R,T)f(R,T) Gravity

The present paper is devoted to investigate the possible emergence of relativistic compact stellar objects through modified $f(R,T)$ gravity. For anisotropic matter distribution, we used Krori and Barura solutions and two notable and viable $f(R,T)$ gravity formulations. By choosing particular observational data, we determine the values of constant in solutions for three relativistic compact star candidates. We have presented some physical behavior of these relativistic compact stellar objects and some aspects like energy density, radial as well as transverse pressure, their evolution, stability, measure of anisotropy and energy conditions.Comment: 27 pages, 13 figures, version accepted for publication in European Physical Journal

Tingkat Kemandirian Pembudidaya Ikan Jelawat (Labtobarbus hoevanii) dalam Segi Modal di Desa Ranah Kecamatan Kampar Kabupaten Kampar Provinsi Riau

Penelitian ini dilaksanakan pada bulan Agustus 2019 di Desa Ranah Kecamatan Kampar Kabupaten Kampar Provinsi Riau. Tujuan penelitian menganalisis tingkat kemandirian dan menganalisis hubungan karakteristik dengan kemandirian pembudidaya. Metode yang digunakan adalah metode survey dengan menggunakan kuisioner. Penentuan reponden menggunakan metode sensus dengan 54 responden. Hasil penelitian menunjukkan bahwa pembudidaya ikan Jelawat di Desa Ranah sebagai berikut: Tingkat kemandirian sebagian besar berada pada kategori tinggi artinya tingkat kemandirian dalam segi modal sudah mandiri dengan indicator yang ada, pembudidaya menggunakan modal sendiri dengan jumlah yang besar, pemanfaatan modal tambahan produktif namun hasil akhir yang tidak memuaskan, sedangkan kemandirian berdasarkan masing-masing responden berada pada kategori cukup artinya hanya dua indicator dari empat indicator yang sudah mandiri. Hubungan kemandirian dengan karakteristik pembudidaya ikan Jelawat di Desa Ranah: Hubungan umur dengan kemandirian berada pada kategori tidak kuat dan tidak searah dan menunjukkan hubungan yang tidak nyata, hubungan pendidikan dengan kemandirian kategori kuat dan searah dan menunjukkan hubungan yang nyata, terhadap pendapatan kategori kurang kuat dan searah dan menunjukkan hubungan yang nyata, terhadap pengalaman usaha kategori kurang kuat dan  searah menunjukkan hubungan yang nyata.&nbsp

Eikenella Corrodens and Streptococcus anginosus co-infection causing skull base osteomyelitis and internal carotid artery lesion

© 2020 The Author(s) A 35-year-old male presented with headaches and fevers. MRI of his head showed skull-based infection of the clivus extended to the right internal carotid artery. Blood and sinus cultures were positive for Eikenella corrodens and Streptococcus anginosus. He had intravenous antibiotics and sinus washout. The patient had full neurological recovery following this