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제목 [ICRANet] ICRANet Newsletter - June/July 2020
Welcome to the ICRANet Newsletter June - July 2020! The Newsletter comes out every two months, summarizing recent ICRANet activities including research, teaching at PhD and graduate level, outreach programs as well as collaboration agreements and news from conferences and workshops. More details on ICRANet can be found in Wikipedia as well as on the official website www.icranet.org, where previous issues of the newsletter are available. See also the associated activities at ICRA website www.icra.it.

ICRANet Newsletter

June-July 2020


1. Press Release ICRA-ICRANet-UNLP-UIS: Geodesic motion of S2 and G2 as a test of the fermionic dark matter nature of our Galactic core

2. News about the 4th Zeldovich virtual meeting, September 7-11, 2020

3. Recent publications

1. Press Release ICRA-ICRANet-UNLP-UIS: Geodesic motion of S2 and G2 as a test of the fermionic dark matter nature of our Galactic core

The anomalous perihelion precession of Mercury around our Sun led to the greatest change of paradigm of physics thanks to the conception of General Relativity by Albert Einstein. The multi-year, high-quality data recording the motion of the closest objects around the compact source at the Galactic center, Sgr A*, led to the verification of the predicted gravitational redshift, to the anomalous precession of S2, as well as to the anomalous fly-by of G2. This heralds a fermionic dark matter dense core interpretation of the nature of Sgr A*, traditionally interpreted as a black hole. A new neutral fermion of 56 keV, a dark matter "ino", for short a "darkino", is basic to this alternative approach. New perspectives are open 1) to the understanding of the predominance of dark matter in our Galaxy and in the large scale of the Universe, 2) to formulate a new paradigm for identifying the seed for the formation of ten-billion-solar-masses black holes in active galactic nuclei, and 3) to address the fundamental physics of the darkinos which, together with the neutrinos, appear to have a fundamental role in accounting for a large portion of the Universe mass-energy. These results are presented in the new article appearing on 9 September 2020, in Astronomy & Astrophysics, co-authored by E.A. Becerra-Vergara, C.R. Argüelles, A. Krut, J.A. Rueda, and R. Ruffini [1].

Harvesting the detailed analysis made possible by the Einstein Theory of General Relativity, the article shows that the motion of the S2 star and the G2 cloud around Sgr A*, traditionally interpreted as due to a black hole of about 4 million solar masses, is instead better explained by the fermionic dark matter dense core of nearly the same mass (see Figs. 1-4 on pages 2-5). The core is composed of darkinos of 56 keV rest mass-energy, roughly 9 times lighter than electrons. This dark matter component extends, from the core, to the entire Galaxy, creating the stable gravitational cradle where all the stars rotate. The dense core formed of these "darkinos" becomes unstable giving origin to a black hole when it reaches a mass of about 100 million solar masses. This represents the lowest black hole seed mass for the growth of supermassive ten-billion-solar-masses black holes in active galactic nuclei.

This discovery has been made possible thanks to some of the largest observational facilities ever achieved in the history of our planet. The data of S2 (see Fig. 1 on page 2 and Fig. 3 on page 4) are taken from the SINFONI ( http://www.icranet.org/telescopes/SINFONI-VLT.jpg) and NACO ( http://www.icranet.org/telescopes/NaCo-VLT.jpg) instruments of the Very Large Telescope (VLT) ( http://www.icranet.org/telescopes/VLT.jpg), operated by the European Southern Observatory (ESO) located on Cerro Paranal in the Atacama Desert in Chile ( http://www.icranet.org/telescopes/potw2023a.jpg), the Keck I ( http://www.icranet.org/telescopes/Keck_I.jpg) and Keck II ( http://www.icranet.org/telescopes/Keck_II.jpg) Telescopes, operated by the W. M. Keck Observatory located in Hawaii ( http://www.icranet.org/telescopes/Keck_ext.jpg), the Gemini North Telescope ( http://www.icranet.org/telescopes/Gemini_int.jpg), operated by the Gemini Observatory located in Hawaii ( http://www.icranet.org/telescopes/Gemini_ext.jpg), as well as from the Subaru Telescope ( http://www.icranet.org/telescopes/Subaru_int.jpg), operated by the National Astronomical Observatory of Japan at the Mauna Kea Observatory on Hawaii ( http://www.icranet.org/telescopes/Subaru_ext.jpg). The observational data of G2 (see Fig. 2 on page 3 and Fig. 4 on page 5) are taken from the SINFONI and NACO instruments of the VLT.

This approach is rooted in the work of Enrico Fermi who introduced the fermions in particle physics. Remo Ruffini recalls: "Eugene Wigner, Nobel laureate colleague of Einstein and Fermi, often stated: the Thomas-Fermi model works better than it should. This model has been leading for 93 years the description of all atoms: a gas of electrons, negatively-charged fermions, attracted electromagnetically by a positively-charged nucleus. In 1973, in Princeton, I addressed the gravitational analog of a Thomas-Fermi atom. Many neutral self-gravitating fermions characterized by their mass and spin, kept in equilibrium by their collective self-gravitation [2]. This idea was developed for years in ICRA and ICRANet, leading to a new approach to neutron stars (see [3] and references therein), and to the dark matter distribution in galaxies in the RAR model [4, 5], here applied to the dark matter galactic cores".

2. News about the 4th Zeldovich virtual meeting, September 7-11, 2020

We are happy to announce the final list of invited speakers at the 4 th Zeldovich virtual meeting.

For more information, please consult our conference website: http://www.icranet.org/zeldovich4

3. Recent publications

M. Haghighat, S. Mahmoudi, R.Mohammadi, S. Tizchang, S.S Xue, Circular polarization of cosmic photons due to their interactions with Sterile neutrino dark matter, submitted for publication on Phys. Rev. D 101, 123016 (2020).

Becerra-Vergara, E. A.; Argüelles, C. R.; Krut, A.; Rueda, J. A.; Ruffini, R., The geodesic motion of S2 and G2 as a test of the fermionic dark matter nature of our galactic core, accepted for publication on July 22, 2020 in Astronomy & Astrophysics.

M. A. Prakapenia, G.V.Vereshchagin, Pauli blocking effects in thermalization of relativistic plasma, accepted for publication on June 14,2020 in Physics Letters A.

N. Sahakyan, Broadband Study of High-Synchrotron-Peaked BL Lac Object 1ES 1218+304, accepted for publication in MNRAS on July 2020.

MAGIC Collaboration, Studying the nature of the unidentified gamma-ray source HESS J1841-055 with the MAGIC telescopes, accepted for publication in MNRAS on July 2020.

MAGIC Collaboration, An intermittent extreme BL Lac: MWL study of 1ES 2344+514 in an enhanced state, in MNRAS, Volume 496, Issue 3, pp.3912-3928.

MAGIC Collaboration, Testing two-component models on very-high-energy gamma-ray emitting BL Lac objects, accepted for publication in A&A on June 2020.

MAGIC Collaboration, Unraveling the Complex Behavior of Mrk 421 with Simultaneous X-Ray and VHE Observations during an Extreme Flaring Activity in 2013 April, in APJ Supplement Series, Volume 248, Issue 2, id.29.

MAGIC Collaboration, Broadband characterization of the very intense TeV flares of the blazar 1ES 1959+650 in 2016, in Astronomy & Astrophysics, Volume 638, id.A14, 16 pp.

Giommi P., Glauch T., Padovani P., Resconi E., Turcati A., Chang Y.L., Dissecting the regions around IceCube high-energy neutrinos: growing evidence for the blazar connection, published on July 16, 2020 in MNRAS.

Giommi P., Padovani P., Oikonomou F., Glauch T., Paiano S., Resconi E., 3HSP J095507.9+355101: a flaring extreme blazar coincident in space and time with IceCube-200107A, accepted for publication in A&A Letters.
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