Considering background quantization of gravitational fields, it is generally assumed that the classical background satisfies Einstein's gravitational equations. However, there exist arguments showing that, for high frequency (quantum) fluctuations, this assumption has to be replaced by a condition describing the back reaction of fluctuations on the background. It is shown that such an approach leads to limitations for the quantum procedure which occur at distances larger than Planck's elementary lengthl=(Gh/c 3)1/2.

The analysis of the measurement of gravitational fields leads to the Rosenfeld inequalities. They say that, as an implication of the equivalence of the inertial and passive gravitational masses of the test body, the metric cannot be attributed to an operator that is defined in the frame of a local canonical quantum field theory. This is true for any theory containing a metric, independently of the geometric framework under consideration and the way one introduces the metric in it. Thus, to (...) establish a local quantum field theory of gravity one has to transit to non-Riemann geometry that contains (beside or instead of the metric) other geometric quantities. From this view, we discuss a Riemann–Cartan and an affine model of gravity and show them to be promising candidates of a theory of canonical quantum gravity. (shrink)

Empirical and theoretical evidence show that the astrophysical problem of dark matter might be solved by a theory of Einstein-Mayer type. In this theory, up to global Lorentz rotations, the reference system is determined by the motion of cosmic matter. Thus, one is led to a “Riemannian space with teleparallelism” realizing a geometric version of the Mach-Einstein doctrine. The field equations of this gravitational theory contain hidden matter terms, where the existence of hidden matter is inferred solely from its gravitational (...) effects. It is argued that, in the nonrelativistic mechanical approximation, they provide an inertia-free mechanics, where the inertial mass of a body is induced by the gravitational action of the comic masses. Interpreted from the Newtonian point of view, this mechanics shows that the effective gravitational mass of astrophysical objects depends on r such that one expects the existence of dark matter. (shrink)

The analysis of the measurement of gravitational fields leads to the Rosenfeld inequalities. They say that, as an implication of the equivalence of the inertial and passive gravitational masses of the test body, the metric cannot be attributed to an operator that is defined in the frame of a local canonical quantum field theory. This is true for any theory containing a metric, independently of the geometric framework under consideration and the way one introduces the metric in it. Thus, to (...) establish a local quantum field theory of gravity one has to transit to non-Riemann geometry that contains (beside or instead of the metric) other geometric quantities. From this view, we discuss a Riemann–Cartan and an affine model of gravity and show them to be promising candidates of a theory of canonical quantum gravity. (shrink)

According to the Einstein-Mayer theory of the Riemanniann space-time with Einstein-Cartan teleparallelism, the local Lorentz invariance is broken by the gravitational field defining Machian reference systems. This breaking of symmetry implies the occurrence of “hidden matter” in the Einstein equations of gravity. The hidden matter is described by the non-Lorentz-invariant energy-momentum tensor $\hat \Theta _{ik}$ satisfying the relation $\hat \Theta _{i;k}^k = 0$ . The tensor $\hat \Theta _{ik}$ is formed from the Einstein-Cartan torsion field given by the anholonomy objects, (...) FAik=2hA[i,k], and appears together with Hilbert’s energy-momentum tensor T* ik and Poincaré’s pressure λgik on the right-hand side of Einstein’s equations so that one has $$R_{ik} - (1/2)g_{ik} R = - \kappa T*_{ik} - \lambda g_{ik} - \hat \Theta _{ik}$$ According to this theory, in the universe and in cosmic systems one must excep “invisible masses” described by the Poincaré and Einstein-Cartan terms to exist. The torsion field FAik makes the space-time a Machian universe; it is of the same nature as the “weak interacting matter” discussed in astrophysics. (shrink)

It is shown that, due to Rosenfeld's inequality relations, there is no possibility of defining states of the Friedmann universe in a physically sensible manner when the world radius becomes equal to or smaller than Planck's length.

The Einstein equations can be written as Fierz-Pauli equations with self-interaction, $W\gamma _{ik} = - G_{ik} + \tfrac{1}{2}g_{ik} g^{mn} G_{mn} - k(T_{ik} - \tfrac{1}{2}g_{ik} g^{mn} T_{mn} )$ together with the covariant Hilbert-gauge condition, $(\gamma _i^h - \tfrac{1}{2}\delta _i^k g^{mn} \gamma _{mn} )_{;k} = 0$ where W denotes the covariant wave operator and G ik the Einstein tensor of the metric g ik collecting all nonlinear terms of Einstein's equations. As is known, there do not, however, exist plane-wave solutions γ ik(z)with (...) g ik Z,i Z,k=0of these equations such that what is essential to the introduction of gravitons is not satisfied in general relativity. This nonexistence corresponds with the uncertainty relation,Δp(Δg*)2(Δx)3≥h hG/ c 3 concerning the total nonlinear gravitational field g *ik =g k +γ k. (shrink)

A discussion of the diffraction and scattering of particles by a grating shows that the experiment discussed by H. Hönl and by L. Rosenfeld in 1965 and again in 1981 does not reveal any contradiction between general relativity and quantum theory. Moreover, these theories, in principle, cannot refute one another because the (weak) principle of equivalence, underlying general relativity theory, entails that gravitation does not alter the laws of microphysics.

In discussing fundamentals of general-relativistic irreversible continuum thermodynamics, this theory is shown to be characterized by the feature that no thermodynamical degrees of freedom are ascribed to gravitation. However, accepting that black hole thermodynamics seems to oppose this harmlessness of gravitation one is called on to consider other approaches. Therefore, in brief some gravitational and thermodynamical alternatives are reviewed.

In discussing fundamentals of general-relativistic irreversible continuum thermodynamics, this theory is shown to be characterized by the feature that no thermodynamical degrees of freedom are ascribed to gravitation. However, accepting that black hole thermodynamics seems to oppose this harmlessness of gravitation one is called on to consider other approaches. Therefore, in brief some gravitational and thermodynamical alternatives are reviewed.

We discuss the meaning and prove the accordance of general relativity, wave mechanics, and the quantization of Einstein's gravitation equations themselves. Firstly, we have the problem of the influence of gravitational fields on the de Broglie waves, which influence is in accordance with Eeinstein's weak principle of equivalence and the limitation of measurements given by Heisenberg's uncertainty relations. Secondly, the quantization of the gravitational fields is a “quantization of geometry.” However, classical and quantum gravitation have the same physical meaning according (...) to limitations of measurements given by Einstein's strong principle of equivalence and the Heisenberg uncertainties for the mechanics of test bodies. (shrink)

It is shown that the covariance together with the quantum principle speak for an affinely connected structure which, for distances greater than Planck’s length, goes over in a metrically connected structure of space-time.

It is shown that the covariance together with the quantum principle speak for an affinely connected structure which, for distances greater than Planck’s length, goes over in a metrically connected structure of space-time.

It is argued that, under the assumption that the strong principle of equivalence holds, the theoretical realization of the Mach principle (in the version of the Mach-Einstein doctrine) and of the principle of general relativity are alternative programs. That means only the former or the latter can be realized—at least as long as only field equations of second order are considered. To demonstrate this we discuss two sufficiently wide classes of theories (Einstein-Grossmann and Einstein-Mayer theories, respectively) both embracing Einstein's theory (...) of general relativity (GRT). GRT is shown to be just that “degenerate case” of the two classes which satisfies the principle of general relativity but not the Mach-Einstein doctrine; in all the other cases one finds an opposite situation.These considerations lead to an interesting “complementarity” between general relativity and Mach-Einstein doctine. In GRT, via Einstein's equations, the covariant and Lorentz-invariant Riemann-Einstein structure of the space-time defines the dynamics of matter: The symmetric matter tensor Ttk is given by variation of the Lorentz-invariant scalar densityL mat, and the dynamical equations satisfied by Tik result as a consequence of the Bianchi identities valid for the left-hand side of Einstein's equations. Otherwise, in all other cases, i.e., for the “Mach-Einstein theories” here under consideration, the matter determines the coordinate or reference systems via gravity. In Einstein-Grossmann theories using a holonomic representation of the space-time structure, the coordinates are determined up to affine (i.e. linear) transformations, and in Einstein-Mayer theories based on an anholonomic representation the reference systems (the tetrads) are specified up to global Lorentz transformations. The corresponding conditions on the coordinate and reference systems result from the postulate that the gravitational field is compatible with the strong equivalence of inertial and gravitational masses. (shrink)

As is well known, the law of parity conservation does not hold in weak interactions. This type of asymmetry created a number of theoretical problems which were solved, first of all, by a new understanding of the features of neutrinos and their role in weak interactions. These solutions were based, however, essentially on the handedness (chirality) of neutrinos which is closely related to their vanishing rest mass. The thesis of neutrinos with nonvanishing rest mass, newly considered in the literature, therefore (...) requires a rediscussion of the early arguments concerning the relation between the neutrino theory and some weak interaction essentials. When one does this, as in the present paper, it is noted that neutrinos with rest mass lead to some difficulties, in particular to a violation of T invariance. (shrink)

Originally published in 1970 this title commemorates the men and ideas that started, inspired and established a pioneer institution in British psychiatry. Based on the impetus of Freudian and related innovations after the First World War, the Tavistock Clinic offered treatment, training and research facilities in the field of neurosis, child guidance and later on group relations. Dr Dicks, who had been associated for nearly forty years with the work and personalities that helped to develop the Tavistock venture, describes the (...) struggles and capacity for survival of the clinic. He shows how, belonging neither to the older classical psychiatry nor to orthodox psychoanalysis, and suspect to both, the Clinic nevertheless became increasingly used by the rest of the profession as a psychotherapeutic resource. Dr Dicks describes the influence of the Tavistock on the medical, psychological and social work scene both before and after the Second World War, and assesses its achievements as a centre of psycho- and socio-dynamic thinking. The Tavistock is shown as a pioneer _sui generis_, launching psychosomatic research and initiating the exciting ventures in social psychiatry associated with the Army in the Second World War. As the Tavistock was the outcome of work with shell-shock victims in the first war, so its offspring, the Institute of Human Relations, was the natural continuation of the military effort in man-management, morale and group dynamic studies. The book includes an account of the inter-relationship between the Clinic, now part of the National Health Service, and the Institute, a private corporation. Still going strong as part of the Tavistock and Portman NHS Foundation Trust today this is an opportunity to revisit its early history. (shrink)

Name der Zeitschrift: Philologus Heft: Ahead of print.

Originally published in 1970 this title commemorates the men and ideas that started, inspired and established a pioneer institution in British psychiatry. Based on the impetus of Freudian and related innovations after the First World War, the Tavistock Clinic offered treatment, training and research facilities in the field of neurosis, child guidance and later on group relations. Dr Dicks, who had been associated for nearly forty years with the work and personalities that helped to develop the Tavistock venture, describes the (...) struggles and capacity for survival of the clinic. He shows how, belonging neither to the older classical psychiatry nor to orthodox psychoanalysis, and suspect to both, the Clinic nevertheless became increasingly used by the rest of the profession as a psychotherapeutic resource. Dr Dicks describes the influence of the Tavistock on the medical, psychological and social work scene both before and after the Second World War, and assesses its achievements as a centre of psycho- and socio-dynamic thinking. The Tavistock is shown as a pioneer _sui generis_, launching psychosomatic research and initiating the exciting ventures in social psychiatry associated with the Army in the Second World War. As the Tavistock was the outcome of work with shell-shock victims in the first war, so its offspring, the Institute of Human Relations, was the natural continuation of the military effort in man-management, morale and group dynamic studies. The book includes an account of the inter-relationship between the Clinic, now part of the National Health Service, and the Institute, a private corporation. Still going strong as part of the Tavistock and Portman NHS Foundation Trust today this is an opportunity to revisit its early history. (shrink)

David Shaw presents a new argument to support the old claim that there is not a significant moral difference between killing and letting die and, by implication, between active and passive euthanasia. He concludes that doctors should not make a distinction between them. However, whether or not killing and letting die are morally equivalent is not as important a question as he suggests. One can justify legal distinctions on non-moral grounds. One might oppose physician- assisted suicide and active euthanasia when (...) performed by doctors on patients whether or not one is in favour of the legalisation of assisted suicide and active euthanasia. Furthermore, one can consider particular actions to be contrary to appropriate professional conduct even in the absence of legal and ethical objections to them. Someone who wants to die might want only a doctor to kill him or to help him to kill himself. However, we are not entitled to everything that we want in life or death. A doctor cannot always fittingly provide all that a patient wants or needs. It is appropriate that doctors provide their expert advice with regard to the performance of active euthanasia but they can and should do so while, qua doctors, they remain hors de combat. (shrink)

In their account of passive euthanasia, Garrard and Wilkinson present arguments that might lead one to overlook significant moral differences between killing and letting die. To kill is not the same as to let die. Similarly, there are significant differences between active and passive euthanasia. Our moral duties differ with regard to them. We are, in general, obliged to refrain from killing each and everyone. We do not have a similar obligation to try to prevent each and everyone from dying. (...) In any case, to be morally obliged to persist in trying to prevent their deaths would be different from being morally obliged to refrain from killing all other people even if we had both obligations. (shrink)

Purpose. The knowledge influence analysis on the formation process of new anthropological images of man in the contexts of scientific achievements and innovative technologies is the basis of this study. It involves the solution of the following tasks: 1) explication of the ontological content of knowledge in the anthropo-cultural senses of the epoch; 2) analysis of the knowledge influence on the process of forming a new type of man; 3) characteristics of the modern anthropological situation in the context of digital (...) culture; 4) substantiation of interrelation of phatic communication with post-truth society in the dimensions of anthropo-social transformations of the present. Theoretical basis. Ontological content of knowledge determines the anthropo-cultural context of the epoch by forming a system of intellectual, value, social meanings of human life. The assertion of new anthropological types of man is caused by the changes in social and cultural space in the context of the growing influence of achievements in scientific knowledge and technology. Digital revolution as the process of expanding the possibilities of informational-digital reality, the substitution of knowledge for information gives rise to Homo digitalis – the digital man. He focuses on phatic communication, which in its intellectual meaninglessness is commensurate with the anthropological dimensions of post-truth society. Originality. It is substantiated that Homo digitalis is the result of a complex set of heterogeneous effects of scientific knowledge, which in modern post-truth conditions appears as different communicative practices. A condition for the formation of a new anthropological type of man in the perspective of scientific and technological progress is the affirmation of ethical wisdom. Conclusions. Knowledge in the process of evolution of socio-cultural life acquires constitutive significance for the process of formation of anthropological situations that manifest themselves in new images of man. Today, he is commensurate with the demands of digital culture, in which human life practices are increasingly becoming information and digital clusters embedded in the reality of a post-truth society. The means of overcoming the passivity of digital man is the formation of a new anthropological type based on a rethinking of the value system. (shrink)

Coggon’s remarks on a previous paper on active and passive euthanasia elicit a clarification and an elaboration of the argument in support of the claim that there is a moral difference between killing and letting die. The relevant moral duties are different in nature, strength and content. Moreover, not all people who are involved in the relevant situations have the same moral duties. The particular case that is presented in support of the claim that to kill is not the same (...) as to let die is based upon a rejection of consequentialism. (shrink)

In line with article 3.4 of EC directive 89/381, Keown has presented an ethical case in support of the policy of voluntary, unpaid donation of blood. Although no doubt is cast on the desirability of the policy, that part of Keown's argument which pertains to the suggested laudability of altruism and of its encouragment by social policy is examined and shown to be dubious.

Death of motor neurones following invasion of the central nervous system by poliovirus may result in paralysis of specific muscles. Virulence may be tested by injection into monkeys by routes which bypass natural infection. Transmissibility is also very important, but cannot be measured, only inferred. An infection may lead to immunity or paralysis. In epidemics, the highest incidence among children 0-2 years was 2% and among those over 10 years was 25%: these figures fit a model of genetic susceptibility of (...) homozygotes and heterozygotes with phenotypic susceptibility increasing with age. Hypogamma-globulinemics, some neonates and pregnant women are more susceptible than others. Intra-muscular injections may increase the risk of paralysis. Strenuous exercise and IM injections given when poliovirus has already reached the spinal cord can increase the severity of paralysis or convert a non-paralytic attack to paralysis. Although vaccines reduced polio in temperate countries, polio was thought to be no problem in the tropics. Since 1977 polio has been recognised as a massive problem in the third world: because it affects babies and very young children, it is properly infantile paralysis. (shrink)

At the beginning of the twentieth century, poliomyelitis presented a scientific and medical challenge of a complexity similar to that of AIDS now. Research on polio, mainly in the US, gradually became focussed to solving basic questions, but was held up by the lack of suitable laboratory techniques. The financing of the research and the wide range of basic topics funded were the model for later medical science. The problem of polio, at least in the wealthier temperate countries, has been (...) solved by the use of vaccines. Many fundamental questions about the mechanism of the disease remained unsolved and this lack of knowledge has contributed to many unfortunate accidents. The history of polio has many lessons for AIDS researchers. (shrink)

_Purpose._ The basis of the presented research is a philosophical and methodological analysis of the human-centrism concept as a new intellectual strategy of comprehending and understanding the prospects of human existence in a situation of information-digital reality, which provides for the consistent solution of the following problems: 1) to make an explication of the conceptual content and semantic loading of human-centrism in the discourses of social philosophy and philosophical anthropology; 2) to analyse the theoretical significance and methodological role of human-centrism (...) in the information-digital reality; 3) to characterize the main parameters of the problematic field of human-centrism in overcoming the crisis of identity and preserving the system of universal human values. _Theoretical basis__._ The objective logic of unfolding of the modern information-digital world transforms philosophical anthropology into a new level of comprehending the human existence. Human-centrism interacts with philosophical anthropology and evaluates it from the point of its metaphilosophical, axiological-existential and methodological content. The assertion of human-centrism is caused by the identity crisis in the context of civilizational transformations, which as a result of the cumulative effect of information technology have a powerful influence on all aspects of human life and thinking. The philosophy of human-centrism as a life-affirming factor determines the development and adaptation of human self-consciousness to the modern socio-cultural environment, determined by information and technological processes. _Originality__._ It is substantiated that human-centrism as a new strategy of modern philosophical and anthropological discourses opens new cognition perspectives of the essence of human in the information-digital reality and contributes to the construction and implementation of new dimensions of identity in interaction with a qualitatively different level of world attitude. _Conclusions__._ The assertion of information-digital reality gives rise to a new type of philosophical and anthropological paradigm, a qualitative manifestation of which is the theory and methodology of human-centrism. It is characterized by a modern level of philosophical reflection, which allows preserving and at the same time renewing the system of universal human values. On this basis, human-centrism is a way of complementarity of all aspects of human life, who reconstructs themselves in a situation of new anthropological dimensions. (shrink)