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The compact and, with ∼4.3±0.3×106 M ⊙ , very massive object located at the center of the Milky Way is currently the very best candidate for a supermassive black hole (SMBH) 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* (SgrA*) in the middle of the central stellar cluster. Simultaneous near-infrared and X-ray observations of SgrA* have revealed insights into the emission mechanisms responsible for the powerful near-infrared and X-ray flares from within a few tens to one hundred Schwarzschild radii of such a putative SMBH. If SgrA* is indeed a SMBH it will, in projection onto the sky, have the largest event horizon and will certainly be the first and most important target for very long baseline interferometry observations currently being prepared by the event horizon telescope (EHT). These observations in combination with the infrared interferometry experiment GRAVITY at the very large telescope interferometer and other experiments across the electromagnetic spectrum might yield proof for the presence of a black hole at the center of the Milky Way. The large body of evidence continues to discriminate the identification of SgrA* as a SMBH from alternative possibilities. It is, however, unclear when the ever mounting evidence for SgrA* being associated with a SMBH will suffice as a convincing proof. Additional compelling evidence may come from future gravitational wave observatories. This manuscript reviews the observational facts, theoretical grounds and conceptual aspects for the case of SgrA* being a black hole. We treat theory and observations in the framework of the philosophical discussions about “(anti)realism and underdetermination”, as this line of arguments allows us to describe the situation in observational astrophysics with respect to supermassive black holes. Questions concerning the existence of supermassive black holes and in particular SgrA* are discussed using causation as an indispensable element. We show that the results of our investigation are convincingly mapped out by this combination of concepts.

Wir können durch unseren Willen unseren Schmerz erträglicher machen. Doch wie und wo wirkt mein Ich (meine Seele) auf meinen Körper ein? Ärzte, Neurophysiologen, Physiker, Philosophen und Psychologen zeigen in diesem Buch, dass der von uns allen gefühlte Dualismus zwischen Körper und Seele nicht existiert. Beides ist untrennbar eine Einheit, über Jahrmillionen gebildet durch adaptive Selbstorganisation des Neuronen-Netzwerkes Gehirn.

We can make our pain more bearable through our will. But how and where does my self (my mind) affect my body? In this books, medical doctors, neurophysiologists, physicists, and psychologists show that the dualism of body and mind we all experience does not really exist. Body and mind are an indivisible unit, shaped over millions of years by the adaptive self-organization of the brain`s neuronal networks.