Dark Matter - Are They Insulators to Electromagnetic Radiation?

The detection of Dark Matter is the greatest outstanding problem in modern cosmology. Several attempts have been taken for this without any remarkable success. To find out a suitable way of detection we need to understand its nature comprehensively. In the present article, a hypothesis is described considering Dark Matter as a normal matter. Its peculiar behavior is explained considering its existence in BEC state in the coolest part of the universe that makes it an electromagnetic insulator. Depending upon this hypothesis an experimental verification method is proposed.

THE BEGINNING OF THE UNIVERSE AS AN EPISTEMOLOGICAL FRONTIER- LEMAÎTRE TO GAMOW

It was in 1922, when Alexandre Friedmann proposed some models for cosmic evolution, that modern cosmology faced for the first time in a scientific way the problem of the origin of the universe. It was the inaugural step of the big bang cosmology (usually known as the Big Bang Theory), to which several important cosmologists contributed over the following decades. Among these cosmologists, there were two who played a special role: Georges Lemaître, who proposed the primeval atom theory, and George Gamow, who later assumed the hot and dense primordial state of the universe which contemporary cosmology continues to admit. In this paper, I present and compare the perspectives of these two great cosmologists towards the idea of the beginning of the universe as an epistemological frontier, that is, as an unsurpassable limit to the physical knowledge of the universe, namely with regard to an explanation of what caused this beginning and how the primordial universe had come into existence. Both cosmologists assumed that the beginning of our universe is located before everything that physics can achieve, but we can identify one important difference: according to Lemaître, the beginning of the universe is located before space and time, and we can admit that is an epistemological beginning and also an ontological beginning; according to Gamow, the beginning of our universe may have been the result of a preexistent cosmological state of the universe which is just inaccessible to physics, and therefore is not an ontological but just an epistemological beginning.

The Philosophical Aspects of the Dialogue between Modern Cosmology and Theology

Introduction. The paper deals with the philosophical problems of the modern dialogue between cosmology and theology. It is argued that no existential contradiction is possible between them as originating in one and the same human condition. The difference between cosmology and theology amounts to the difference in their open-ended hermeneutics of the outer world. It is from within this philosophical conclusion that the hot issue of the dialogue are discussed and some insights are proposed.Methodology and sources. The philosophical analysis is based on the discussion of epistemological issues in modern cosmology and their relevance to theological view of the world. The method is similar to existential phenomenology’s approach to the constitution of the notion of the universe in cosmology and theology as an open-ended hermeneutics of the world.Results and discussion. It is shown that no existential contradiction is possible between two types of hermeneutics as originating in one and the same human condition. It is human being that becomes the major theme of the dialogue between cosmology and theology.On the basis of the conclusions made the paper discusses some “hot” issues in the contemporary cosmology-theology discussion, including: 1) The inseparability of cosmology and theology in justification of the possibility of cosmological knowledge, 2) Fine-tuning, Anthropic principle, fitness of the universe for life, 3) The unknowability of the universe and apophaticism in cosmology, 4) Multiple universes and their ontology, 5) How much of life is in the universe: the Search for Extraterrestrial Intelligence (SETI), exoplanets and theological consequence for multiple incarnations, 6) The origin of the universe in modern scientific cosmology and its relevance to the theologically understood creatio ex nihilo, 7) Consciousness and the universe: can cosmology account for its own possibility without appealing to the theologically understood human capacity in producing an intellectual synthesis of the universe.Conclusion. On the basis of the methods applied to the hot issues in the dialogue between cosmology and theology one concludes that the dialogue between cosmology and theology is an open-ended enterprise related to the fundamentally concealed origins of humanity and universe. The difference is hermeneutics of the universe does not create any contradiction or tension but reflects a dualistic position of humanity in the universe, being an insignificant part of it and at the same time its center of disclosure and manifestation.

A Tale of Two Infinities

The spectacular advances of modern astronomy have opened our horizon on an unexpected cosmos: a dark, mysterious Universe, populated by enigmatic entities we know very little about, like black holes, or nothing at all, like dark matter and dark energy. In this book, I discuss how the rise of a new discipline dubbed multimessenger astronomy is bringing about a revolution in our understanding of the cosmos, by combining the traditional approach based on the observation of light from celestial objects, with a new one based on other ‘messengers’—such as gravitational waves, neutrinos, and cosmic rays—that carry information from otherwise inaccessible corners of the Universe. Much has been written about the extraordinary potential of this new discipline, since the 2017 Nobel Prize in physics was awarded for the direct detection of gravitational waves. But here I will take a different angle and explore how gravitational waves and other messengers might help us break the stalemate that has been plaguing fundamental physics for four decades, and to consolidate the foundations of modern cosmology.

Dark Matter

I introduce here the problem of dark energy, a substance that appears to be pushing the Universe to expand ever faster and discuss the large effort currently in place to understand its origin. I describe the surprising recent discovery of a widening crack in the cathedral of modern cosmology arising from the measurement of the expansion rate of the Universe. And I argue that gravitational waves observations can help us to either repair that crack, or to bring down that magnificent building, in case it turns out to be fatally flawed. Before all women and all men. Before animals, plants, archaeans, bacteria. Before the Earth was formed and the stars were lit. Before everything we know, the Universe was immersed in an amorphous and oblivious darkness.

The Architecture of the Cosmos

In the first part of the book, I discuss the discovery of gravitational waves and the birth of multimessenger astronomy. Borrowing the structure of Dante’s Paradise and Inferno, I illustrate the biggest mysteries of modern cosmology and argue that multimessenger astronomy, and in particular gravitational waves, may hold the key to unlock these mysteries, and may thus help a bridge between the realm of gravity, and that of quantum physics. Stars. Black holes. Galaxies. Even the most well-known celestial objects are so removed from our daily experience that we might almost mistake them for abstract entities. Yet they are no less real than the objects that surround you as you read these lines.

Possible Modification of the Standard Cosmological Model to Resolve a Tension with Hubble Constant Values

The tensions concerning the values of Hubble constant obtained from the early and the late Universe data pose a significant challenge to modern cosmology. Possible modifications of the flat homogeneous isotropic cosmological ΛCDM model are considered, in which the Universe contains the dark energy, cold baryonic matter, and dark matter. They are based on general relativity and satisfy two requirements: (1) the value of the Hubble constant calculated from the value of the Hubble parameter at the recombination by formulas of the flat ΛCDM model, should be equal to 92% of the one based on low-redshift observations; (2) deviations from the ΛCDM model should not lead to effects that contradict astronomical observations and estimations obtained thereof. The analysis showed that there are few opportunities for the choice. Either we should consider DM with negative pressure −pdmc2 ≪ pdm < 0, which weakly affects the evolution of the Universe and the observed manifestations of DM, or we should admit the mechanism of generation of new matter, for example, by the dark energy decay.