A Modified Gravity and its Consequences for the Solar System, Astrophysics and Cosmology

A relativistic modified gravity (MOG) theory leads to a self-consistent, stable gravity theory that can describe the solar system, galaxy and clusters of galaxies data and cosmology.Comment: 16 pages. Latex file. Talk given at the International Workshop "From Quantum to Cosmos: Fundamental Physics in Space", 22-24 May, 2006, Warrenton, Virginia, USA. To be published in Int. J. Mod. Phys D. Equation correcte

Effects of very high turbulence on convective heat transfer

The effects of high-intensity, large-scale turbulence on turbulent boundary-layer heat transfer are studied. Flow fields were produced with turbulence intensities up to 40% and length scales up to several times the boundary layer thickness. In addition, three different types of turbulence will be compared to see whether they have the same effect on the boundary layer. The three are: the far field of a free jet, flow downstream of a grid, and flow downstream of a simulated gas turbine combustor. Each turbulence field will be characterized by several measures: intensity (by component), scale, and spectrum. Heat transfer will be measured on a 2.5 m long, 0.5 m wide flat plate using the energy-balance technique. The same plate will be used in each of the four flow fields; a low-turbulence tunnel for baseline data, and the three flow situations mentioned

The Bullet Cluster 1E0657-558 evidence shows Modified Gravity in the absence of Dark Matter

A detailed analysis of the November 15, 2006 data release (Clowe et al., 2006) X-ray surface density Sigma-map and the strong and weak gravitational lensing convergence kappa-map for the Bullet Cluster 1E0657-558 is performed and the results are compared with the predictions of a modified gravity (MOG) and dark matter. Our surface density Sigma-model is computed using a King beta-model density, and a mass profile of the main cluster and an isothermal temperature profile are determined by the MOG. We find that the main cluster thermal profile is nearly isothermal. The MOG prediction of the isothermal temperature of the main cluster is T = 15.5 +- 3.9 keV, in good agreement with the experimental value T = 14.8{+2.0}{-1.7} keV. Excellent fits to the two-dimensional convergence kappa-map data are obtained without non-baryonic dark matter, accounting for the 8-sigma spatial offset between the Sigma-map and the kappa-map reported in Clowe et al. (2006). The MOG prediction for the kappa-map results in two baryonic components distributed across the Bullet Cluster 1E0657-558 with averaged mass-fraction of 83% intracluster medium (ICM) gas and 17% galaxies. Conversely, the Newtonian dark matter kappa-model has on average 76% dark matter (neglecting the indeterminant contribution due to the galaxies) and 24% ICM gas for a baryon to dark matter mass-fraction of 0.32, a statistically significant result when compared to the predicted Lambda-CDM cosmological baryon mass-fraction of 0.176{+0.019}{-0.012} (Spergel et al., 2006).Comment: Accepted for publication in Mon. Not. Roy. Astron. Soc. -- July 26, 2007. In press. 28 pages, 15 figures, 5 table

Black Hole Thermodynamics in MOdified Gravity (MOG)

We analyze the thermodynamical properties of black holes in a modified theory of gravity, which was initially proposed to obtain correct dynamics of galaxies and galaxy clusters without dark matter. The thermodynamics of non-rotating and rotating black hole solutions resembles similar solutions in Einstein-Maxwell theory with the electric charge being replaced by a new mass dependent gravitational charge $Q = \sqrt{\alpha G_N}M$. This new mass dependent charge modifies the effective Newtonian constant from $G_N$ to $G = G_N(1+\alpha)$, and this in turn critically affects the thermodynamics of the black holes. We also investigate the thermodynamics of regular solutions, and explore the limiting case when no horizons forms. So, it is possible that the modified gravity can lead to the absence of black hole horizons in our universe. Finally, we analyze corrections to the thermodynamics of a non-rotating black hole and obtain the usual logarithmic correction term.Comment: Title changed slightly; new section on BH entropy corrections added; matches version published in PL

Gravitational Waves in the Nonsymmetric Gravitational Theory

We prove that the flux of gravitational radiation from an isolated source in the Nonsymmetric Gravitational Theory is identical to that found in Einstein's General Theory of Relativity.Comment: 10 Page

Full-coverage film cooling: 3-dimensional measurements of turbulence structure and prediction of recovery region hydrodynamics

Hydrodynamic measurements were made with a triaxial hot-wire in the full-coverage region and the recovery region following an array of injection holes inclined downstream, at 30 degrees to the surface. The data were taken under isothermal conditions at ambient temperature and pressure for two blowing ratios: M = 0.9 and M = 0.4. Profiles of the three main velocity components and the six Reynolds stresses were obtained at several spanwise positions at each of the five locations down the test plate. A one-equation model of turbulence (using turbulent kinetic energy with an algebraic mixing length) was used in a two-dimensional computer program to predict the mean velocity and turbulent kinetic energy profiles in the recovery region. A new real-time hotwire scheme was developed to make measurements in the three-dimensional turbulent boundary layer over the full-coverage surface

The Free Exercise of Copyright Behind Bars

People in prison produce vast amounts of creative and expressive work—from paintings and sculptures to essays, novels, music, and NFTs—but they are rarely described as artists and their work is often not described as “art.” Prisoners also do not regularly take advantage of copyright law, the primary form of protection for creative works. They should. Copyright provides a strong set of rights that combines strains of free expression values with elements of property rights. Copyright confers dignitary and expressive benefits and, for some creators, financial rewards. As such, copyright can be a tool to help prisoners improve their lives, both while they are incarcerated and after they are released. In the prison context, copyright should be thought of as akin to a civil right and a part of the movement to reform the U.S. carceral system, empowering those who create. Moreover, because copyright is a right in intangibles, there is no reason that prisoners cannot or should not advance and vindicate their copyright interests just as they would if they were not incarcerated. In other words, copyright behind bars should not operate any differently than copyright in the free world. This Article first describes the enormous range of artistic work created by those who are imprisoned, as well as the prison system’s regular attempts to deter and suppress such work. The Article then explains how copyright law protects virtually all of these works and why copyright is valuable to prisoners and should become part of the carceral reform project. Finally, the Article argues that there is no reason to limit the exercise of copyright by those who are incarcerated and no justification for impinging on prisoners’ ability to create, disseminate, and profit from their expressive and artistic works

Human Capital as Intellectual Property? Non-Competes and the Limits of IP Protection

Non-compete agreements have become increasingly common in recent years, imposed on twenty to forty percent (or more) of employees in some industries, both in the knowledge-intensive fields where they might be expected but also in the service industries on low-wage workers. As non-competes have proliferated, they have become increasingly controversial. Much of the discussion revolves around whether the agreements help or hinder innovation and economic growth. While this is also accompanied by some concern about the effect of non-competes on employees, little attention has been paid to the fact that employers use non-competes as tools for protecting intellectual property and in doing so treat human capital as form of intellectual property. Taking the IP justification seriously—that is, examining the efficiency and utilitarian arguments surrounding non-compete agreements—reveals the troubling personal autonomy and dignitary consequences of non-compete enforcement. From an efficiency perspective, the evidence is conflicting: it is far from clear that non-compete enforcement is necessary for increased innovation and economic growth. From a personal autonomy perspective, on the other hand, it is quite clear that non-competes have a variety of negative consequences. Evaluating non-competes under an IP framework and with the principles that are applied to other forms of intellectual property makes clear that treating human capital as a form of intellectual property, and using those agreements to control that IP, is deeply problematic