Damghan University PressJournal of Holography Applications in Physics2783-47782120220101Inflation driven by Barrow holographic dark energy11221210.22128/jhap.2022.464.1012ENSayani MaityDepartment of Mathematics, Techno India Salt Lake, Sector-V, Kolkata-700 091, India.Prabir RudraDepartment of Mathematics, Asutosh College, Kolkata-700026, W. B., IndiaJournal Article20211005In this work we have investigated the inflation mechanism driven by the Barrow Holographic dark energy (BHDE) in the early universe. BHDE is based on the Barrow relation for horizon entropy, which in turn is inspired from the shape of the COVID-19 virus. It was shown by Barrow that the quantum gravitational effects may instigate complex fractal features in the structure of a black hole. Since the length scale during the inflation is expected to be small, the energy density obtained from the application of the holographic principle in the early universe will be large enough to support the inflationary scenario. Using the Granda-Oliveros IR cut-off we have studied the inflationary scenario with the universe filled with BHDE. Various analytic solutions for the model were found out including the slow-roll parameters, scalar spectral index and tensor-to-scalar ratio. Since inflation is generally attributed to the presence of scalar fields, we have explored a correspondence between BHDE and scalar field models. Both canonical scalar field and the Tachyonic scalar field have been considered for this purpose. The evolution of the potential generated from the fields are plotted and found to be consistent with the observations. From the work we see that BHDE can be a model of dark energy that can successfully drive the early time inflation.https://jhap.du.ac.ir/article_212_3d04bbefdcc2fe08e076cb34a7797d22.pdfDamghan University PressJournal of Holography Applications in Physics2783-47782120220101Two-field inflationary model and swampland de Sitter conjecture132420710.22128/jhap.2021.452.1002ENSaeed Noori GashtiDepartment of Physics, Faculty of Basic Sciences, University of Mazandaran P. O. Box 47416-95447,
Babolsar, Iran.0000-0001-7844-2640Journal Article20210927In this paper, we are going to investigate a new perspective of the two-field inflation<br />model with respect to the swampland dS conjecture. At the first step, we study the two-fields<br />inflation model, and apply the swampland conjecture to our model. Then, we calculate some<br />cosmological parameters such as scalar spectrum index, tensor-to-scalar ratio, and compare our<br />results with the recent observational data. Also, we give numerical analysis to show agreement<br />with observational data.https://jhap.du.ac.ir/article_207_79a23fb8a9bd1667d8fa02dbabb21c46.pdfDamghan University PressJournal of Holography Applications in Physics2783-47782120220101A modified thermodynamics of rotating and charged BTZ black hole254820610.22128/jhap.2021.454.1004ENSudhaker UpadhyayDepartment of Physics, K.L.S college, Magadh University, Nawada-805110, India0000-0002-3880-7315Nadeem UlIslamDepartment of Physics, National Institute of Technology, Srinagar-190006, Kashmir, India0000-0001-9978-6426Prince A.GanaiDepartment of Physics, National Institute of Technology, Srinagar-190006, Kashmir, IndiaJournal Article20211001We present the thermodynamics of a charged and rotating BTZ black holes here. In particular, we derive <br />expressions for various macroscopic thermal quantities such as entropy, Hawking temperature, <br />Helmholtz free energy, internal energy, enthalpy, Gibbs free energy, and specific heat.<br />To study the effects of small statistical thermal fluctuations around the <br />equilibrium on thermodynamics, we calculated the leading-order corrections to the various<br />thermodynamical potentials of charged and <br />rotating BTZ black hole and do comparative analysis for the fixed values of charge and angular momentum.https://jhap.du.ac.ir/article_206_972a7c31dde282d0a2ef00a554bcc31e.pdfDamghan University PressJournal of Holography Applications in Physics2783-47782120220101Transmission via triangular double barrier and magnetic fields in graphene497021410.22128/jhap.2022.462.1010ENMiloud MekkaouiLaboratory of Theoretical Physics
Faculty of Sciences
Ibn Maachou StreetAhmed JellalLaboratory of Theoretical Physics
Faculty of Sciences
Ibn Maachou StreetHocine BahlouliPhysics Department, King Fahd University of Petroleum & Minerals,
Dhahran 31261, Saudi ArabiaJournal Article20211013We study the transmission probability of Dirac fermions in graphene scattered by a triangular<br /><br />double barrier potential in the presence of an external magnetic field. Our system made of two<br /><br />triangular potential barrier regions separated by a well region characterized by an energy gap<br /><br />Gp . Solving our Dirac-like equation and matching the solutions at the boundaries we express our<br /><br />transmission and reflection coefficients in terms of transfer matrix. We show in particular that the<br /><br />transmission exhibits oscillation resonances that are manifestation of the Klein tunneling effect.https://jhap.du.ac.ir/article_214_a4d59cbe4fc86b7e1d0b433e3db5c5b0.pdfDamghan University PressJournal of Holography Applications in Physics2783-47782120220101Particles collision near regular charged black holes718821310.22128/jhap.2022.465.1013ENPameli SahaDepartment of Mathematics, Indian Institute of Engineering
Science and Technology, Shibpur, Howrah-711 103, India.Ujjal DebnathDepartment of Mathematics, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, IndiaJournal Article20211022In this work, we consider a static spherically symmetric charged regular black hole to investigate arbitrarily high centre of mass energy near the horizon with particle collision for extremal case in the equatorial plane ($theta=pi/2$). Here we also study circular geodesics and find the ISCO and MBCO redii. We analysis the two neutral particles collision with same masses and different masses. Also we analyze the particle collision with massless photon and photon-photon collision near the horizon of this regular black hole to calculate centre of mass energy.https://jhap.du.ac.ir/article_213_1bc76bfa988f95017edd20f0a5ee77f1.pdfDamghan University PressJournal of Holography Applications in Physics2783-47782120220101Topological order of quantum gravity in AdS3 spacetime899321510.22128/jhap.2022.481.1014ENJingbo WangInstitute for Gravitation and Astrophysics, College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, 464000, P. R. China0000-0002-7702-1411Journal Article20211210Topological order is a new type order that beyond Landau's symmetry breaking theory. It has some interesting properties, such as producing quasi-particles with fractional quantum numbers and fractional/Fermi statistics, robust gapless boundary modes and emergent gauge excitations. In this essay, we will show that the quantum gravity in AdS<sub>3</sub> spacetime can also have topological orders. Actually the theory has all the three features that define the topological order. We conjecture that quantum gravity in four dimension can also have topological orders.https://jhap.du.ac.ir/article_215_73e0bd429f2c74d629dc0d5e621b21b0.pdf