Spherically symmetric Einstein-aether perfect fluid models

We investigate spherically symmetric cosmological models in Einstein-aether theory with a tilted (non-comoving) perfect fluid source. We use a 1+3 frame formalism and adopt the comoving aether gauge to derive the evolution equations, which form a well-posed system of first order partial differential equations in two variables. We then introduce normalized variables. The formalism is particularly well-suited for numerical computations and the study of the qualitative properties of the models, which are also solutions of Horava gravity. We study the local stability of the equilibrium points of the resulting dynamical system corresponding to physically realistic inhomogeneous cosmological models and astrophysical objects with values for the parameters which are consistent with current constraints. In particular, we consider dust models in ($\beta-$) normalized variables and derive a reduced (closed) evolution system and we obtain the general evolution equations for the spatially homogeneous Kantowski-Sachs models using appropriate bounded normalized variables. We then analyse these models, with special emphasis on the future asymptotic behaviour for different values of the parameters. Finally, we investigate static models for a mixture of a (necessarily non-tilted) perfect fluid with a barotropic equations of state and a scalar field.Comment: 52 pages, 7 figures. Matches the published version. arXiv admin note: text overlap with arXiv:gr-qc/0603058 by other author

MF2378

Susan A. Latta, Herbs: magic, medicine, or mystery?, Kansas State University, March 1999

Letter from Samuel A. Latta to James B. Finley

Latta summarizes the compromise made between he and Finley at the 1845 Ohio Annual Conference -- Finley acknowledged that he had been misled when he charged Latta with publishing his southern letter to Jacky Bradley [Finley letter supposedly sympathetic to the south]. Finley and Dr. Elliott agreed to print a correction to the accusatory letter in the Western Christian Advocate. Latta asks why the correction has not appeared yet in the Advocate? Abstract Number - 550https://digitalcommons.owu.edu/finley-letters/1846/thumbnail.jp

Letter from Samuel A. Latta to James B. Finley

Latta responds to Finley\u27s eloquent and learned letter with delight. His medical practice is going well. He regrets that some in his community are joining the Masons. Abstract Number - 628https://digitalcommons.owu.edu/finley-letters/1724/thumbnail.jp

Letter from Samuel A. Latta to James B. Finley

In this letter, Latta vehemently denies a charge made against him by Finley in the last issue of the Western Christian Advocate. Finley accuses Latta of orchestrating the publication of a letter he once sent ( southern letter to Jacky Bradley, supposedly sympathetic to the south). Latta considers Finley to be one of his best friends and is deeply hurt and perplexed by Finley\u27s accusations. Abstract Number - 549https://digitalcommons.owu.edu/finley-letters/1845/thumbnail.jp

Letter from Samuel A. Latta to James B. Finley

Latta writes in the hope that Finley will attend the quarterly meeting at Hamilton. Abstract Number - 176https://digitalcommons.owu.edu/finley-letters/1174/thumbnail.jp

Treatment of Recurrent Eczema Herpeticum in Pregnancy With Acyclovir

Background: Eczema herpeticum is an uncommon manifestation of an infection with herpes simplex virus (HSV). The disease is primarily seen in patients with histories of atopic eczema. Eczema herpeticum may be a life-threatening illness, but the mortality is felt to be <10% with modern antiviral and antibacterial agents. The use of acyclovir for other viral infections secondary to herpesvirus in pregnancy has been well documented. The authors now present a case report of eczema herpeticum treated with acyclovir during pregnancy

The effects of regional insolation differences upon advanced solar thermal electric power plant performance and energy costs

The performance and cost of the 10 MWe advanced solar thermal electric power plants sited in various regions of the continental United States were determined. The regional insolation data base is discussed. A range for the forecast cost of conventional electricity by region and nationally over the next several cades are presented

The effects of regional insolation differences upon advanced solar thermal electric power plant performance and energy costs

The performance and cost of four 10 MWe advanced solar thermal electric power plants sited in various regions of the continental United States was studied. Each region has different insolation characteristics which result in varying collector field areas, plant performance, capital costs and energy costs. The regional variation in solar plant performance was assessed in relation to the expected rise in the future cost of residential and commercial electricity supplied by conventional utility power systems in the same regions. A discussion of the regional insolation data base is presented along with a description of the solar systems performance and costs. A range for the forecast cost of conventional electricity by region and nationally over the next several decades is given

Unimodular Gravity and Averaging

The question of the averaging of inhomogeneous spacetimes in cosmology is important for the correct interpretation of cosmological data. In this paper we suggest a conceptually simpler approach to averaging in cosmology based on the averaging of scalars within unimodular gravity. As an illustration, we consider the example of an exact spherically symmetric dust model, and show that within this approach averaging introduces correlations (corrections) to the effective dynamical evolution equation in the form of a spatial curvature term.Comment: 10 page