283 research outputs found
Thermodynamic properties of Kehagias-Sfetsos black hole and KS/CFT correspondence
No full textWe speculate on various thermodynamic features of the inner horizon and outer horizons of Kehagias-Sfetsos (KS) black hole (BH) in the background of the Hořava-Lifshitz gravity. We compute particularly the area product, area sum, area minus and area division of the BH horizons. We find that they all are not showing universal behavior whereas the product is a universal quantity (Pradhan P.
Thermodynamic product formula for Hořava–Lifshitz black hole
No full textAbstractWe examine the thermodynamic properties of inner and outer horizons in the background of Hořava–Lifshitz black hole. We compute the horizon radii product, the surface area product, the entropy product, the surface temperature product, the Komar energy product and the specific heat product for both the horizons. We show that surface area product, entropy product and irreducible mass product are universal (mass-independent) quantities, whereas the surface temperature product, Komar energy product and specific heat product are not universal quantities because they all depend on mass parameter. We further study the stability of such black hole by computing the specific heat for both the horizons. It has been observed that under certain condition the black hole possesses second order phase transition
Managing the effects of tax expenditures on the national budget
No full textTax expenditures, in the form of tax provisions, are government expenditures. They are conceptually and functionally distinct from those tax provisions whose purpose is to raise revenue. Tax expenditure programs are comparable to entitlement programs. Therefore, tax expenditures must be analyzed in spending terms and integrated into the budgetary process to ensure fiscal accountability. In addition, tax expenditures must be audited for performance and the information must be published (with comprehensive analysis) to ensure fiscal transparency. The author analyzes the concept and definition, size, and effects of tax expenditures, as well as the fiscal accountability and transparency of tax expenditure spending. In short, tax expenditures affect (1) the budget balance,(2) budget prioritization in allocation, (3) the effectiveness and efficiency of fiscal resources, and (4) the scope for abuse by taxpayers, government officials and legislators. While reviewing the current practices in tax expenditures against the requirements of fiscal accountability and transparency, she finds that this fiscal area must be strengthened. The author sketches four building blocks to strengthen tax expenditures toward fiscal accountability and transparency, based on the literature developed by Surry and McDaniel, the practices from industrial and developing countries, the Campos and Pradhan fiscal accountability model, and the International Monetary Fund's fiscal transparency code. The author argues that normative/benchmark tax structure, a revenue-raising component of the tax system, should be formalized. The normative/benchmark tax structure should be legally defined in the tax law and should be transparent. The tax receipts from this normative/benchmark tax structure should be quantified and published. Presently, many countries could publish imputed tax revenue from normative/benchmark tax structures because such data is available. Only if imputed tax revenue is published in the same way as the other budget components-tax revenue received, tax expenditures, direct expenditures, and fiscal balance-will a budget system be truly transparent in terms of revenue-raising activities and expenditure activities. In addition, when the tax revenue-raising activity is formalized, the inherent spending nature of tax expenditures is further exposed. Therefore, tax expenditures should be added to direct expenditures forming total government expenditures. Furthermore, the conventional concept of the size of government should be remedied by including both direct expenditures and tax expenditures.Public Sector Economics&Finance,Tax Law,Fiscal Adjustment,Public Sector Fiscal Adjustment,Economic Theory&Research
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First person – Roopali Pradhan
No full textABSTRACT First Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Roopali Pradhan is first author on ‘Lamin A/C modulates spatial organization and function of the Hsp70 gene locus via nuclear myosin I’, published in JCS. Roopali conducted the research described in this article while an integrated MS-PhD student in Dr Kundan Sengupta's lab at Indian Institute of Science Education and Research (IISER), Pashan, Pune, India. She is now a postdoctoral research associate in the lab of Prof. Julie Ahringer at Wellcome Trust/Cancer Research UK Gurdon Institute, UK, where she is interested in understanding chromatin organization across development and ageing, particularly the regulation imparted by nuclear landmarks and transcriptional activity in shaping local and global genome architecture
Anisotropic stars in 4D Einstein-Gauss-Bonnet gravity
No full textWe wish to thank the anonymous reviewer for comments and suggestions. The author T. T would like to thank the financial support from the Science Achievement Scholarship of Thailand (SAST) . A. Pradhan thanks to IUCCA, Pune, India for providing fa-cilities under associateship programmes. The author G. P. thanks the FundacAo para a Ciencia e Tecnologia (FCT) , Portugal, for the financial support to the Center for Astrophysics and Gravitation-CENTRA, Chile, Instituto Superior Tecnico, Universidade de Lis-boa, Portugal, through the Project No. UIDB/00099/2020 and No. PTDC/FIS-AST/28920/2017
Thermodynamic Product Relations for Generalized Regular Black Hole
No full textWe derive thermodynamic product relations for four-parametric regular black hole (BH) solutions of the Einstein equations coupled with a nonlinear electrodynamics source. The four parameters can be described by the mass (m), charge (q), dipole moment (α), and quadrupole moment (β), respectively. We study its complete thermodynamics. We compute different thermodynamic products, that is, area product, BH temperature product, specific heat product, and Komar energy product, respectively. Furthermore, we show some complicated function of horizon areas that is indeed mass-independent and could turn out to be universal
Thermodynamic products for Sen black hole
No full textWe investigate the properties of inner and outer horizon thermodynamics of Sen black hole (BH) both in Einstein frame (EF) and string frame (SF). We also compute area (or entropy) product, area (or entropy) sum of the said BH in EF as well as SF. In the EF, we observe that the area (or entropy) product is universal, whereas area (or entropy) sum is not universal. On the other hand, in the SF, area (or entropy) product and area (or entropy) sum don’t have any universal behaviour because they all are depends on Arnowitt–Deser–Misner (ADM) mass parameter. We also verify that the first law is satisfied at the Cauchy horizon as well as event horizon (EH). In addition, we also compute other thermodynamic products and sums in the EF as well as in the SF. We further compute the Smarr mass formula and Christodoulou’s irreducible mass formula for Sen BH. Moreover, we compute the area bound and entropy bound for both the horizons. The upper area bound for EH is actually the Penrose like inequality, which is the first geometric inequality in BHs. Furthermore, we compute the central charges of the left and right moving sectors of the dual CFT in Sen/CFT correspondence using thermodynamic relations. These thermodynamic relations on the multi-horizons give us further understanding the microscopic nature of BH entropy (both interior and exterior)
Mass-independent area (or entropy) and thermodynamic volume products in conformal gravity
No full text In this work, we investigate the thermodynamic properties of conformal gravity in four dimensions. We compute the area (or entropy) functional relation for this black hole (BH). We consider both de Sitter (dS) and anti-de Sitter (AdS) cases. We derive the Cosmic-Censorship-Inequality which is an important relation in general relativity that relates the total mass of a spacetime to the area of all the BH horizons. Local thermodynamic stability is studied by computing the specific heat. The second-order phase transition occurs at a certain condition. Various types of second-order phase structure have been given for various values of a and the cosmological constant [Formula: see text] in the Appendix. When a = 0, one obtains the result of Schwarzschild–dS and Schwarzschild–AdS cases. In the limit aM [Formula: see text] 1, one obtains the result of Grumiller spacetime, where a is nontrivial Rindler parameter or Rindler acceleration and M is the mass parameter. The thermodynamic volume functional relation is derived in the extended phase space, where the cosmological constant is treated as a thermodynamic pressure and its conjugate variable as a thermodynamic volume. The mass-independent area (or entropy) functional relation and thermodynamic volume functional relation that we have derived could turn out to be a universal quantity. </jats:p
Thermodynamic Product Relations for Generalized Regular Black Hole
No full textWe derive thermodynamic product relations for four-parametric regular black hole (BH) solutions of the Einstein equations coupled with a nonlinear electrodynamics source. The four parameters can be described by the mass ( ), charge ( ), dipole moment ( ), and quadrupole moment ( ), respectively. We study its complete thermodynamics. We compute different thermodynamic products, that is, area product, BH temperature product, specific heat product, and Komar energy product, respectively. Furthermore, we show some complicated function of horizon areas that is indeed mass-independent and could turn out to be universal
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