Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session W10: Alternative Gravity I |
Hide Abstracts |
Sponsoring Units: GGR Chair: David Garfinkle, Oakland University Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), St. Louis A |
Tuesday, April 15, 2008 10:45AM - 10:57AM |
W10.00001: Relativistic Thermodynamics: Theory and Computer Experiment Constantin Rasinariu A thermodynamic system in uniform translation appears to a stationary observer to be a) colder $T = T_0/\gamma$ according to Planck and Einstein (1907), or b) hotter $T = T_0 \gamma$ according to Ott (1963), where $\gamma = (1-v^2/c^2)^{-1/2}$. The heated debate regarding the laws of transformation for the relativistic quantities is yet to be settled. In this paper I address the relativistic law of transformation of the temperature from the perspective of imposing the relativistic covariance of the fundamental laws of thermodynamics. Also, I report results from computer simulation of fully relativistic 2- dimensional molecular dynamics. I conclude that J\"uttner distribution is well reproduced experimentally and I investigate the relativistic law of transformation of the temperature. [Preview Abstract] |
Tuesday, April 15, 2008 10:57AM - 11:09AM |
W10.00002: Suggested Applicability of Position Varying G Theory When the Time Variation is Small John James The Dicke-Sciama equation for G, where $\frac{1}{G}=\sum {\frac{m}{Rc^2}} $ is summed over the mass of the universe not receding faster than the speed of light, can be derived from simple application of special relativity. G is then a function of the position of matter but G need not be varying with time in a significant way. The time variation due to Hubble expansion can be eliminated by new matter contributing to the sum above due to the slowing of the expansion. The time rate of change due to motion of the earth through the galactic plane is nearly comparable to the $\frac{{dG} \mathord{\left/ {\vphantom {{dG} {dt}}} \right. \kern-\nulldelimiterspace} {dt}}{G}=\frac{10^{-13}}{year}$ constraint from experiment. Position variation of G from the DS equation explains the dark matter problem and type II population stars in a consistent manner. A reversal of the Carter analysis, in which there is a sensitivity of cosmic phenomena to physical constants, suggests a window on the observable portions of the universe. Only the portions of the universe where G is within a few percent of the value measured in our solar system are visible. The carter window analysis can be extended to explain the variation of heavy elements in stellar populations since supernovae distribution of such elements is also a very sensitive function of G. [Preview Abstract] |
Tuesday, April 15, 2008 11:09AM - 11:21AM |
W10.00003: Higher Dimensional Gauss-Bonnet FRW Cosmology Chad Middleton, Keith Andrew, Brett Bolen We examine the effect on cosmological evolution of adding a Gauss-Bonnet term to the standard Einstein-Hilbert action for a (1 + 3) + d dimensional Friedman-Robertson- Walker (FRW) metric. By assuming that the additional dimensions compactify as a power law as the usual 3 spatial dimensions expand, we solve the resulting dynamical equations and find that the solution may be of either de Sitter or Kasner form depending upon whether the Gauss-Bonnet term or the Einstein term dominates. [Preview Abstract] |
Tuesday, April 15, 2008 11:21AM - 11:33AM |
W10.00004: Reconciling ``Frozen Star'' and ``Point Singularity'' Models of Black Holes. Emmett Redd Kevin S. Brown$^{1}$ gives a good discussion of the formation and growth of black holes (BH). However, he does not reconcile the ``frozen star'' (corresponding to the ``field interpretation'' of Weinberg) and the ``point singularity'' (``geometric interpretation'' of Misner/Thorne/Wheeler) models. His main concern is ``there is no known mechanism for'' a frozen star's mass to ``have been pushed \textit{outward}''. However, no push is required because all event horizons (little ones, big ones, or growing ones) are at the same potential energy level. He correctly claims that the BH's mass ``is in two places (both inside and outside the event horizon) at the same coordinate time,'' and that the event horizons are surfaces of future null infinity. These three facts reconcile the models and leads to more satisfactory answer to how gravity gets out of a BH, i.e., it does not have to get out; it exists outside the event horizon until future null infinity. And, at the same coordinate time, it is at the point singularity, creating the event horizon. 1. http://www.mathpages.com/rr/s7-02/7-02.htm. [Preview Abstract] |
Tuesday, April 15, 2008 11:33AM - 11:45AM |
W10.00005: Hilbert Versus GEM Action Smackdown Doug Sweetser In 1915, Hilbert wrote the action used for gravity: \[ S_{GR} = \int \sqrt{- g} d^4 x R \] As an amateur, I have worked on an alternative that unifies gravity and EM. Proposed in 2001, the action has been smacked down, only to come back with required alterations to its present form: \[ S_{GEM} = \int \sqrt{- g} d^4 x (- J^u A_{u \bot} + J^u A_{u ||} \] \[ - \frac{1}{4} (\nabla^u A^v - \nabla^v A^u) (\nabla_u A_v - \nabla_v A_u) - \frac{1}{4} (\nabla^u A^v + \nabla^v A^u) (\nabla_u A_v + \nabla_v A_u)) \] The two actions will be contrasted because they make different predictions for light bending around the Sun at second order PPN accuracy, and for the polarization of quadrapole moment gravity waves. [Preview Abstract] |
Tuesday, April 15, 2008 11:45AM - 11:57AM |
W10.00006: Time and Consistent Relativity Theory Lyubomir T. Gruyitch Physical reality permitted to characterize clearly and fully the properties of \textit{time}. They imply both the physical sense of \textit{time} relativity and the mathematical fundamentals of a new, consistent, relativity theory. New formulae for temporal and spatial coordinates express \textit{time} independence of space, which is a priori rejected in Einstein's theory. They and those for velocity and acceleration, as well as for mass, force, and energy, are crucially different from Einstein's formulae in the general case. The values of all variables in them are consistent relative to scales and units, but not in Einstein's. In the special case the formulae take the known form, but rest still more general than Einstein's. They reduce to Einstein's in the particular singular case determined by Einstein's assumptions. A proved result of the theory is that for every speed, not only for the light speed, we can define easily co-ordinate transformations such that the chosen speed is invariant relative to the transformations. Such transformations for the light speed are the Lorentz transformations. The Lorentz-Einstein invariance of the light speed is neither the property of light nor of its speed. [Preview Abstract] |
Tuesday, April 15, 2008 11:57AM - 12:09PM |
W10.00007: E=2mc$^2$ Kwadwo Dompreh The Albert Einstein mass-energy equation $E=mc^2$ which is used primarily in the estimation of the amount of energy in fission reaction can be can be modified to give an equation which is used calculate the amount of energy in a fusion reaction. This theory is deduced using the Gedenken experiment used in special relativity and a computer simulation using the Matrix laboratory. The energy harnessed is non -- radioactive and can be used to power our homes, industries and even our automobiles. When the equation is applied to cosmological bodies such as the Suns, Starts and others gives a better understanding of their origin. [Preview Abstract] |
Tuesday, April 15, 2008 12:09PM - 12:21PM |
W10.00008: Rates of Charged Clocks in an Electric Field. Murat Ozer The gravitational arguments leading to time dilation, redshift, and spacetime curvature are adapted to electric fields. The energy levels of two identical positively charged atoms at different potentials in a static electric field are shown to undergo blueshift. Secondly, the period of a charged simple pendulum (clock) in the electric field of a metallic sphere is shown to vary with the electric potential. The spacetime diagram for the world lines of two photons emitted and absorbed by two pendulums at different potentials at different times and the world lines of the pendulums, as in Schild's argument, is shown to be not a parallelogram in Minkowski spacetime, concluding that spacetime must be curved. A Pound-Rebka-Snider experiment in an electric field is proposed to confirm that photons undergo a frequency shift in an electric field and hence the spacetime manifold is curved. Next, Torretti's gravitational argument that spacetime around a mass distribution concentrated at a point is curved is extended to electric charge distributions to conclude that the nonuniform electric fields of such charge distributions too curve spacetime. Finally, the local equivalence of a uniform electric field times the charge to mass ratio to a uniform acceleration is shown through spacetime transformations and the electrical redshift is obtained in a uniformly accelerated frame by using this principle. These arguments lead to the conclusion that special relativistic electromagnetism is an approximation to a general relativistic multi-metric theory. [Preview Abstract] |
Tuesday, April 15, 2008 12:21PM - 12:33PM |
W10.00009: ABSTRACT WITHDRAWN |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700