نتایج جستجو برای: developed horizons
تعداد نتایج: 772676 فیلتر نتایج به سال:
We suggest that all horizons of spacetime, no matter whether they are black hole, Rindler, or de Sitter horizons, have certain microscopic properties in common. We propose that these properties may be used as the starting points, or postulates, of a microscopic theory of gravity. ∗ e-mail: [email protected]
The previous sessions have borne witness to the fact &at high energy accelerator and storage ring technology is a.subject of continuing vitality. Nothing dramatizes this more convincingly than the chart (Fig. 1) which shows the growth in energy of the world’s accelerators in time. If one includes in this chart the equivalent laboratory energy of existing and projected colliding beam storage rin...
Cooperation is a widespread natural phenomenon yet current evolutionary thinking is dominated by the paradigm of selfish competition. Recent advances in many fronts of Biology and Non-linear Physics are helping to bring cooperation to its proper place. In this contribution, the most important controversies and open research avenues in the field of social evolution are reviewed. It is argued tha...
Introduction Ectopic pregnancy may be defined as implantation of fertilized ovum out side the normal uterine cavity. It may occur in tube (95%), the uterus (intramural, angular, cervical or in rudimentary horn), the ovary, the broad ligament or else where in the peritoneal cavity. The common site in the tube is the ampulla, followed by the isthmus. In the ampulla, the pregnancy is often expelle...
This editorial celebrates the re-launch of PMC Biophysics previously published by PhysMath Central, in its new format as BMC Biophysics published by BioMed Central with an expanded scope and Editorial Board. BMC Biophysics will fill its own niche in the BMC series alongside complementary companion journals including BMC Bioinformatics, BMC Medical Physics, BMC Structural Biology and BMC Systems...
Many soils have clay-enriched horizons that are thought to result from pedogenic processes. Various hypotheses are proposed for expected clay size-distributions in soil profiles. The average size of clay crystallites determined by the amount of broadening of x-ray diffraction peaks ranged from 160 to >2000A 0 , but the lack of trends in four loess-de• rived soils did not permit the hypotheses t...
A set of boundary conditions defining an undistorted, non-rotating isolated horizon are specified in general relativity. A space-time representing a black hole which is itself in equilibrium but whose exterior contains radiation admits such a horizon. However, the definition is applicable in a more general context, such as cosmological horizons. Physically motivated, (quasi-)local definitions o...
Data acquired from various scientific disciplines in the past five years have converged to elevate the status of panspermia as one of the major contenders in theories of the origins of life on Earth. We review the trends that point towards a vindication of the idea that biomaterial from comets may be distributed widely throughout the universe and might even be reaching us in the present day.
We study spherically symmetric dynamical horizons (SSDH) in spherically symmetric Einstein/matter spacetimes. We first determine sufficient and necessary conditions for an initial data set for the gravitational and matter fields to satisfy the dynamical horizon condition in the spacetime development. The constraint equations reduce to a single second order linear “master” equation, which leads ...
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