30,878 research outputs found
Lost City meteorite: Its recovery and a comparison with other fireballs
Lost City meteoroid trajectory analysis and determination of original mas
Lost City meteorite - It's recovery and a comparison with other fireballs
Photographic and trajectory data for Lost City meteor and establishment of calibration of mass scale of other meteor
Lexicographic choice functions without archimedeanicity
We investigate the connection between choice functions and lexicographic probabilities, by means of the convexity axiom considered by Seidenfeld, Schervisch and Kadane (2010) but without imposing any Archimedean condition. We show that lexicographic probabilities are related to a particular type of sets of desirable gambles, and investigate the properties of the coherent choice function this induces via maximality. Finally, we show that the convexity axiom is necessary but not sufficient for a coherent choice function to be the infimum of a class of lexicographic ones
INTERPERSONAL HEART-BRAIN REGISTRATION AND THE PERCEPTION OF PARENTAL LOVE: A 42 YEAR FOLLOW-UP OF THE HARVARD MASTERY OF STRESS STUDY
A dynamical energy systems approach to cardiac energy predicts that the registration of cardiac energy can occur between individuals, and that the degree of registration may be greater in persons who are more open to interpersonal information. As part of a 42 year follow-up to the Harvard Mastery of Stress study, 19 channels of EEG and the ECG were recorded during a 2 minute eyes closed resting baseline from 20 Harvard graduates currently in their 60's and from an experimenter who sat 3 feet in front of the subjects. Cardiac synchronized energy patterns were calculated in the subjects' EEGs separately triggered by the subjects' ECG and the experimenter's ECG. When the subjects' own ECG was used as the trigger, significant evidence of the subjects' ECG in the subjects' EEG was found, primarily in the posterior regions. When the experimenter's ECG was used as the trigger, significant evidence of the experimenter's ECG in the subjects' EEG was found, primarily in anterior regions, in subjects who rated themselves in college as having been raised by loving parents. These subjects were also significantly healthier in late adulthood than subjects who rated their parents "low in loving." Implications for theory and research in energy medicine are considered
A volumetric Penrose inequality for conformally flat manifolds
We consider asymptotically flat Riemannian manifolds with nonnegative scalar
curvature that are conformal to , and so that
their boundary is a minimal hypersurface. (Here, is open
bounded with smooth mean-convex boundary.) We prove that the ADM mass of any
such manifold is bounded below by , where is the
Euclidean volume of and is the volume of the Euclidean
unit -ball. This gives a partial proof to a conjecture of Bray and Iga
\cite{brayiga}. Surprisingly, we do not require the boundary to be outermost.Comment: 7 page
About Superluminal motions and Special Relativity: A Discussion of some recent Experiments, and the solution of the Causal Paradoxes
Some experiments, performed at Berkeley, Cologne, Florence, Vienna, Orsay,
Rennes, etc., led to the claim that something seems to travel with a group
velocity larger than the speed c of light in vacuum. Various other experimental
results seem to point in the same direction: For instance, localized wavelet-
type solutions to Maxwell equations have been found, both theoretically and
experimentally, that travel with superluminal speed. [Even muonic and
electronic neutrinos [it has been proposed] might be "tachyons", since their
square mass appears to be negative]. With regard to the first-mentioned
experiments, it was recently claimed by Guenter Nimtz that those results with
evanescent waves (or tunneling photons) imply superluminal signal and impulse
transmission, and therefore violate Einstein causality. In this note we want to
stress that, on the contrary, all such results do not place relativistic
causality in jeopardy, even if they referred to actual tachyonic motions: In
fact, Special Relativity can cope even with superluminal objects and waves. For
instance, it is possible (at least in microphysics) to solve also the known
causal paradoxes, devised for faster than light motion, although this is not
widely recognized yet. Here we show, in detail and rigorously, how to solve the
oldest causal paradox, originally proposed by Tolman, which is the kernel of
many further tachyon paradoxes (like J.Bell's, F.A.E.Pirani's, J.D.Edmonds' and
others'). The key to the solution is a careful application of tachyon
mechanics, as it unambiguously follows from special relativity. At Last, in one
of the two Appendices, we propose how to evaluate the group-velocity in the
case of evanescent waves. [PACS nos.: 03.30.+p; 03.50.De; 41.20.Jb; 73.40.Gk;
84.40.Az; 42.82.Et ]Comment: LaTeX file: 26 pages, with 5 Figures (and two Appendices). The
original version of this paper appeared in the Journal below
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