منابع مشابه
Messengers of the Extreme Universe
The highest energy messengers arriving on Earth bring information from the most energetic events occuring in the universe since the Big Bang. These extreme environments cannot be reproduced in terrestrial laboratories. Instead, physics at these extremes is studied using telescopes and detectors that span many orders of magnitude in energy (from 10 eV photons to 10 eV cosmic rays). Sources range...
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As it is well known, symmetry plays a crucial role in the theoretical physics. On other hand, the Noether symmetry is a useful procedure to select models motivated at a fundamental level, and to discover the exact solution to the given lagrangian. In this work, Noether symmetry in f(T) theory on a spatially homogeneous and anisotropic Bianchi type I universe is considered. We discuss the Lagran...
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Recent years have seen tremendous progress in our understanding of the extreme universe, which in turn points to even deeper questions to be further addressed. History has shown that the symbiosis between direct observations and laboratory investigation is instrumental in the progress of astrophysics. Current frontier astrophysical phenomena related to particle astrophysics and cosmology typica...
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The surgical operating microscope was introduced in the early 1920s, but it was largely ignored until 1950, when it was reintroduced by Richard A. Perritt for use in microsurgical operations in opthamology.1 The magnification and illumination provided by the microscope has resulted in its acceptance as an essential part of the surgical armamentarium. Microsurgical techniques gained widespread a...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2019
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201833670