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The year 2015 was the International Year of Light. It marked, however, also the 20th anniversary of the first observation of Bose-Einstein condensation in atomic vapors by Eric Cornell, Carl Wieman and Wolfgang Ketterle. This discovery can…

Quantum Gases · Physics 2017-01-04 Alessio Celi , Anna Sanpera , Veronica Ahufinger , Maciej Lewenstein

This talk was given at the Tunguska-2001 international conference but it is not about the Tunguska event. Instead we tried to give some flavor of mirror matter, which is predicted to exist if parity is an unbroken symmetry of nature, to…

Astrophysics · Physics 2007-05-23 Z. K. Silagadze

Historian Herbert Mehrtens sought to portray the history of turn-of-the-century mathematics as a struggle of modern vs countermodern, led respectively by David Hilbert and Felix Klein. Some of Mehrtens' conclusions have been picked up by…

History and Overview · Mathematics 2018-05-29 Jacques Bair , Piotr Błaszczyk , Peter Heinig , Mikhail G. Katz , Jan Peter Schäfermeyer , David Sherry

Spontaneous symmetry breaking in grand unified theories is thought to have produced an exceedingly large number of magnetic monopoles in the early Universe. In the absence of suppression or annihilation, these very massive particles should…

High Energy Physics - Phenomenology · Physics 2023-11-16 Fulvio Melia

This note is devoted to a detail concerning the work of Albert Einstein and Peter Bergmann on unified theories of electromagnetism and gravitation in five dimensions. In their paper of 1938, Einstein and Bergmann were among the first to…

History and Philosophy of Physics · Physics 2014-02-03 Edward Witten

The most well tested and successful model of particle physics is the Standard Model (SM). It is shown here that the restoration of the full SM symmetry (as in the Early Universe) leads to the result that the electric charge loses all…

General Physics · Physics 2007-05-23 Afsar Abbas

On the occasion of centenary of superconductivity discovery I recall some facts from the first period and attempts to understand the phenomenon. It turns out that most famous physicists of the first half of XX century have tried to solve…

History and Philosophy of Physics · Physics 2023-07-19 Karol I. Wysokinski

Alexander Friedmann and Georges Lema\^itre are undoubtedly the real fathers of Big Bang cosmologies. In this article I study the influences their work underwent due to some religious as well as anti-religious ideas. During his career…

History and Philosophy of Physics · Physics 2023-06-01 Jean-Pierre Luminet

Georges Lemaitre was a remarkable contributor to the advancement of cosmology in the heady years following two great revolutions in theoretical physics in the last century: general relativity and quantum mechanics. In the present century,…

History and Philosophy of Physics · Physics 2020-07-21 Simon A. Mitton

Paramount among the processes that ended the cosmic `dark ages' must have been the formation of the first generation of stars (the so-called Population III). We summarize recent progress in constraining its nature, and we discuss the basic…

Astrophysics · Physics 2009-11-07 Volker Bromm , Paolo S. Coppi , Richard B. Larson

This is a brief introduction to the life and ideas of the Lithuanian-German physicist, philosopher and religious thinker Max B. Weinstein, who is today best known for his thoughts concerning so-called pandeism. An accomplished theoretical…

History and Philosophy of Physics · Physics 2019-02-07 Helge Kragh

The concept of extremely dense matter at supra-nuclear density was first speculated by L. Landau in the beginning of 1930s when neutron was just discovered. A historical review on these issues not only explains the interaction between micro…

General Physics · Physics 2011-03-03 Renxin Xu

Gamma-ray bursts are the most luminous explosions in the Universe, and their origin as well as mechanism are the focus of intense research and debate. More than three decades since their serendipitous discovery, followed by several…

High Energy Astrophysical Phenomena · Physics 2011-12-06 P. N. Bhat , S. Guiriec

The origin of the highest energy cosmic rays represents one of the most conspicuous enigmas of modern astrophysics, in spite of gigantic experimental efforts in the past fifty years, and of active theoretical research. The past decade has…

High Energy Astrophysical Phenomena · Physics 2015-06-11 M. Lemoine

Johannes Kepler described the Copernican universe as consisting of a central, small, brilliant sun with its planetary system, all surrounded by giant stars. These stars were far larger than, and much dimmer than, the sun -- his De Stella…

History and Philosophy of Physics · Physics 2019-06-11 Christopher M. Graney

This paper discusses the history of Fraunhofer's puzzling discovery of the fixed lines in various spectra (most notably of the sun) and the implications of these spectral "imperfections". Moreover, the developments in spectroscopy by…

Popular Physics · Physics 2025-10-28 Prachurjo Dutta Roy

Astrophysical paradoxes are the paradoxes of physics. The main motivation of a formulated paradox is clearly recognized in the scientific environment because the phenomenon of a paradox itself has become interesting. There is an explanation…

History and Philosophy of Physics · Physics 2008-12-10 Dragoljub A. Cucic

Shown is that contrary to common intuition, even an arbitrarily weak attenuating mechanism is sufficient to make the background sky quite dark independently of the size of the universe and the Hubble expansion. Further shown is that such an…

Astrophysics · Physics 2007-05-23 V. Guruprasad

It would be reasonable to recall some critical issues in physical cosmology development. GR was created by A. Einstein in 1915. In 1917 Einstein proposed the first (static) cosmological model. Soon after the A. Eddington proved that the…

History and Philosophy of Physics · Physics 2025-12-30 Alexander F. Zakharov

A critical re-examination of the double-slit experiment and its variants is presented to clarify the nature of what Feynmann called the ``central mystery'' and the ``only mystery'' of quantum mechanics, leading to an interpretation of…

Quantum Physics · Physics 2015-02-16 Partha Ghose