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We study prospects of constraining the primordial magnetic field (PMF) and its evolution during the dark ages and cosmic dawn in light of EDGES 21-cm signal. Our analysis has been carried out on a `colder IGM' background which is one of the…

Cosmology and Nongalactic Astrophysics · Physics 2020-07-13 Ankita Bera , Kanan K. Datta , Saumyadip Samui

We propose a new hypothesis for the origin of the major part of non-solar hadronic cosmic rays (CRs) at all energies: highly relativistic, narrowly collimated jets from the birth or collapse of neutron stars (NSs) in our Galaxy accelerate…

Astrophysics · Physics 2011-05-23 A. Dar , R. Plaga

Recent international efforts have brought us closer to unveiling the century old mystery of the origin of cosmic rays. Cosmic ray, gamma ray, and neutrino observatories are reaching the necessary sensitivity to study the highest energy…

High Energy Astrophysical Phenomena · Physics 2012-03-16 Angela V. Olinto

A new model of nonlinear electromagnetic fields possessing a dimensional parameter $\beta$ is proposed. Electromagnetic fields are considered as the source of the gravitation field and accelerated expansion of the universe is driven by…

General Relativity and Quantum Cosmology · Physics 2016-03-25 S. I. Kruglov

As first shown by Shvartsman (1970), a neutron star accreting close to the Eddington limit must acquire a positive charge in order for electrons and protons to move at the same speed. The resulting electrostatic field may contribute to…

Astrophysics · Physics 2009-10-28 R. Turolla , S. Zane , A. Treves , A. Illarionov

Recently, there has been an increased interest in the study of the generation of low-energy cosmic rays (CRs; < 1 TeV) in shocks situated on the surface of a protostar or along protostellar jets. These locally accelerated CRs offer an…

High Energy Astrophysical Phenomena · Physics 2021-06-02 Marco Padovani , Alexandre Marcowith , Daniele Galli , Leslie K. Hunt , Francesco Fontani

The high-energy universe has revealed that energetic particles are ubiquitous in the cosmos and play a vital role in the cultivation of cosmic environments on all scales. Energetic particles in our own galaxy, galactic cosmic rays (GCRs),…

A model for the localized quantum vacuum is proposed in which the zero-point energy of the quantum electromagnetic field originates in energy- and momentum-conserving transitions of material systems from their ground state to an unstable…

Quantum Physics · Physics 2008-11-26 Daniela Dragoman

Particles are accelerated to very high, non-thermal energies during explosive energy-release phenomena in space, solar, and astrophysical plasma environments. While it has been established that magnetic reconnection plays an important role…

For the nonthermal radio emission of the Galactic Center Arc in situ electron acceleration is imperative. The observed radio spectrum can be modeled by a transport equation for the relativistic electrons which includes particle acceleration…

Astrophysics · Physics 2009-11-10 S. Lieb , H. Lesch , G. T. Birk

Recent observations of excess radiation at extreme ultraviolet and hard X-ray energies straddling the well known thermal soft X-ray emission have provided new tools and puzzles for investigation of the acceleration of nonthermal particles…

Astrophysics · Physics 2007-05-23 Vahé Petrosian

Abstract This paper provides elements in support of the random zero-point radiation field (zpf) as an essential ontological ingredient needed to explain distinctive properties of quantum-mechanical systems. We show that when an otherwise…

Quantum Physics · Physics 2022-11-01 Ana María Cetto , Luis de la Peña

Recent studies of Type Ia Supernovae with redshifts up to about $z~\laq~1$ reveal evidence for a cosmic acceleration in the expansion of the Universe. The most straightforward explanation to account for this acceleration is a cosmological…

General Relativity and Quantum Cosmology · Physics 2009-10-31 O. Bertolami , P. J. Martins

Agegraphic dark energy, has been recently proposed, based on the so-called Karolyhazy uncertainty relation, which arises from quantum mechanics together with general relativity. In the first part of the article we study the original…

Cosmology and Nongalactic Astrophysics · Physics 2015-03-17 O. A. Lemets , D. A. Yerokhin , L. G. Zazunov

I review the origin and properties of electromagnetic fields produced in heavy ion collisions. The field strength immediately after a collision is proportional to the collision energy and reaches eB\sim(m_\pi)^2 at RHIC and eB\sim10…

High Energy Physics - Phenomenology · Physics 2013-01-21 Kirill Tuchin

The origin of the most energetic cosmic ray particles is one of the most important open problems in astrophysics. Despite a big experimental effort done in the past years, the sources of these very energetic particles remain unidentified.…

High Energy Astrophysical Phenomena · Physics 2015-06-17 A. D. Supanitsky , G. Medina-Tanco

We study the phase space dynamics of cosmological models in the theoretical formulations of non-minimal metric-torsion couplings with a scalar field, and investigate in particular the critical points which yield stable solutions exhibiting…

General Relativity and Quantum Cosmology · Physics 2017-08-18 Arshdeep Singh Bhatia , Sourav Sur

We analyze the zero point energy of composite particles (or resonances) which are dynamically created from relativistic fermions. We compare the zero point energies in medium to the vacuum one, taking into account the medium modification of…

High Energy Physics - Phenomenology · Physics 2020-02-12 Toru Kojo

The recent discoveries of several reliable events of high energy cosmic rays at an energy above 10^20 eV raise questions about their path through the nearby universe. The two analyses of the Haverah Park data set and the Akeno data set…

Astrophysics · Physics 2009-09-25 Peter L. Biermann , Hyesung Kang , Dongsu Ryu

We estimate that the vacuum electric field associated with a spinning Magnetospheric Eternally Collapsing Object MECO (www.phys.uni-sofia.bg/~astro/abbrev.html) could be higher by a factor of ~ 10^4 than the corresponding pulsar value…

Astrophysics · Physics 2007-05-23 Abhas Mitra