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  1. Quantum Gravity.Claus Kiefer - 2004 - Oxford University Press UK.
    The search for a quantum theory of the gravitational field is one of the great open problems in theoretical physics. This book presents a self-contained discussion of the concepts, methods and applications that can be expected in such a theory. The two main approaches to its construction - the direct quantisation of Einstein's general theory of relativity and string theory - are covered. Whereas the first attempts to construct a viable theory for the gravitational field alone, string theory assumes that (...)
     
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    Can Quantum Theory Be Applied to the Universe as a Whole?Claus Kiefer - 2010 - Foundations of Physics 40 (9-10):1410-1418.
    I argue that quantum theory can, and in fact must, be applied to the Universe as a whole. After a general introduction, I discuss two concepts that are essential for my chain of arguments: the universality of quantum theory and the emergence of classical behaviors by decoherence. A further motivation is given by the open problem of quantum gravity. I then present the main ingredients of quantum cosmology and discuss their relevance for the interpretation of quantum theory. I end with (...)
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    The Arguments of Time, Jeremy Butterfield (Ed.).Claus Kiefer - 2001 - Erkenntnis 54 (3):407-411.
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    The Milky Way’s Supermassive Black Hole: How Good a Case Is It?Andreas Eckart, Andreas Hüttemann, Claus Kiefer, Silke Britzen, Michal Zajaček, Claus Lämmerzahl, Manfred Stöckler, Monica Valencia-S., Vladimir Karas & Macarena García-Marín - 2017 - Foundations of Physics 47 (5):553-624.
    The compact and, with \ M\, very massive object located at the center of the Milky Way is currently the very best candidate for a supermassive black hole in our immediate vicinity. The strongest evidence for this is provided by measurements of stellar orbits, variable X-ray emission, and strongly variable polarized near-infrared emission from the location of the radio source Sagittarius A* in the middle of the central stellar cluster. Simultaneous near-infrared and X-ray observations of SgrA* have revealed insights into (...)
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    Does Time Exist in Quantum Gravity?Claus Kiefer - 2015 - Zagadnienia Filozoficzne W Nauce 59:7-24.
    Time is absolute in standard quantum theory and dynamical in general relativity. The combination of both theories into a theory of quantum gravity leads therefore to a “problem of time”. In my essay, I investigate those consequences for the concept of time that may be drawn without a detailed knowledge of quantum gravity. The only assumptions are the experimentally supported universality of the linear structure of quantum theory and the recovery of general relativity in the classical limit. Among the consequences (...)
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  6. Der Zeitbegriff in der Quantengravitation.Claus Kiefer - 1990 - Philosophia Naturalis 27 (1):43-65.
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  7. Probleme der Quantengravitation.Claus Kiefer - 1994 - Philosophia Naturalis 31 (2):309-327.
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