P. Mészáros
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On call-duty of medical Professionals – Changing the Paradigm of its Assessment as a Results of new Decisions of the Court of Justice of the European Union Open
Background: New court decisions of the Court of Justice of the European Union change the paradigm of assessing on-call duty outside the workplace for healthcare workers so that it can be considered working time in certain circumstances des…
Modified Schwarzschild spacetime in Ricci-flat brane Open
Considering an ansatz for $1+3+n$ dimensional static spacetime with uniform $n$-branes stacked in three-dimensional rotationally symmetric space, we found different classes of vacuum solutions of Einstein field equations. We analyzed these…
Effects of exotic solid-like matter in the post-inflationary universe Open
This brief paper provides a new analysis of observational restrictions on inflationary and post-inflationary cosmological models based on results including the solid inflation model, as well as its combination with single scalar field. The…
View article: Pathways to Discovery in Astronomy and Astrophysics for the 2020s
Pathways to Discovery in Astronomy and Astrophysics for the 2020s Open
We live in an extraordinary period of discovery in astronomy and astrophysics. Six Nobel Prizes have been awarded over the past decade alone for discoveries based on astronomical data (dark energy, gravitational waves, neutrino oscillation…
VHE gamma-rays from the hyper-bright GRB 221009A: implications for external inverse-Compton and proton synchrotron emission Open
The detection of the hyper-bright gamma-ray burst (GRB) 221009A provides an opportunity to investigate the nature of GRB emission and the origin of very-high-energy (VHE) gamma-rays. In this study, we examine the GeV-TeV emission within th…
Comparison of conventional right colectomy and complete mesocolic excision technique—case–control analysis of short-term results Open
Summary Introduction The long-term oncologic advantages of complete mesocolic excision (CME) with central vascular ligation and extended lymphadenectomy in right-sided colon cancer have been emphasized in several studies, without compromis…
External Inverse-compton and Proton Synchrotron Emission from the Reverse Shock as the Origin of VHE Gamma Rays from the Hyper-bright GRB 221009A Open
The detection of the hyper-bright gamma-ray burst (GRB) 221009A enables us to explore the nature of the GRB emission and the origin of very high-energy gamma rays. We analyze the Fermi Large Area Telescope (Fermi-LAT) data of this burst an…
Evolution of perturbations in a universe with exotic solid-like matter Open
We study cosmological perturbations in a universe with only one matter component described by a triplet of fields. Configuration of these fields is the same as for body coordinates of a solid, and they enter the matter Lagrangian only thro…
External Inverse-compton and Proton Synchrotron Emission from the Reverse Shock as the Origin of VHE Gamma Rays from the Hyper-bright GRB 221009A Open
The detection of the hyper-bright gamma-ray burst (GRB) 221009A enables us to explore the nature of the GRB emission and the origin of very high-energy gamma rays. We analyze the Fermi Large Area Telescope (Fermi-LAT) data of this burst an…
Constraints on the redshift and luminosity distributions of gamma-ray bursts in an Einstein-de Sitter universe Open
Two models of the gamma-ray burst population, one with a standard candle luminosity and one with a power-law luminosity distribution, are χ2-fitted to the union of two data sets: the differential number versus peak flux distribution of BAT…
View article: GeV Signatures of Short Gamma-Ray Bursts in Active Galactic Nuclei
GeV Signatures of Short Gamma-Ray Bursts in Active Galactic Nuclei Open
The joint detection of gravitational waves and the gamma-ray counterpart of a binary neutron star merger event, GW170817, unambiguously validates the connection between short gamma-ray bursts and compact binary object (CBO) mergers. We foc…
GeV Signatures of Short Gamma-Ray Bursts in Active Galactic Nuclei Open
The joint detection of gravitational waves and the gamma-ray counterpart of a binary neutron star merger event, GW170817, unambiguously validates the connection between short gamma-ray bursts and compact binary object (CBO) mergers. We foc…
External Inverse-Compton Emission from Low-luminosity Gamma-Ray Bursts: Application to GRB 190829A Open
The detection of TeV gamma-ray bursts (GRBs) brought new opportunities for studying the physics of particle acceleration at relativistic shocks. The High Energy Stereoscopic System (H.E.S.S.) telescopes recently observed very-high-energy (…
ALMA and NOEMA constraints on synchrotron nebular emission from embryonic superluminous supernova remnants and radio–gamma-ray connection Open
Fast-rotating pulsars and magnetars have been suggested as the central engines of superluminous supernovae (SLSNe) and fast radio bursts, and this scenario naturally predicts non-thermal synchrotron emission from their nascent pulsar wind …
Post-merger Jets from Supermassive Black Hole Coalescences as Electromagnetic Counterparts of Gravitational Wave Emission Open
As a powerful source of gravitational waves (GW), a supermassive black hole (SMBH) merger may be accompanied by a relativistic jet that leads to detectable electromagnetic (EM) emission. We model the propagation of post-merger jets inside …
Neutron conversion–diffusion: a new model for structured short gamma-ray burst jets compatible with GRB 170817 Open
We present a generic theoretical model for the structuring of a relativistic jet propagating through the ejecta of a binary neutron star merger event, introducing the effects of the neutron conversion–diffusion, which provides a baryon flu…
High-energy neutrino emission subsequent to gravitational wave radiation from supermassive black hole mergers Open
Supermassive black hole (SMBH) coalescences are ubiquitous in the history of the Universe and often exhibit strong accretion activities and powerful jets. These SMBH mergers are also promising candidates for future gravitational wave detec…
Multimessenger observations of counterparts to IceCube-190331A Open
High-energy neutrinos are a promising tool for identifying astrophysical sources of high and ultra-high energy cosmic rays (UHECRs). Prospects of detecting neutrinos at high energies (≳TeV) from blazars have been boosted after the recent a…
Hidden Cores of Active Galactic Nuclei as the Origin of Medium-Energy Neutrinos: Critical Tests with the MeV Gamma-Ray Connection Open
Mysteries about the origin of high-energy cosmic neutrinos have deepened by the recent IceCube measurement of a large diffuse flux in the 10-100 TeV range. Based on the standard disk-corona picture of active galactic nuclei (AGN), we prese…
Soft MeV Gamma-Ray Background from Low-Luminosity Active Galactic Nuclei and Connection to the Origin of IceCube PeV Neutrinos Open
Low-luminosity active galactic nuclei (LL AGNs) have radiatively inefficient accretion flows (RIAFs), where thermal electrons naturally emit not only synchrotron photons but also soft gamma rays via the Comptonization of their synchrotron …
Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos Open
The Universe is filled with a diffuse background of MeV gamma-rays and PeV neutrinos, whose origins are unknown. Here, we propose a scenario that can account for both backgrounds simultaneously. Low-luminosity active galactic nuclei have h…
Linking extended and plateau emissions of short gamma-ray bursts Open
Some short gamma-ray bursts (SGRBs) show a longer lasting emission phase, called extended emission (EE) lasting ${\sim}10^{2\!-\!3}\, \rm s$, as well as a plateau emission (PE) lasting ${\sim}10^{4\!-\!5}\, \rm s$. Although a long-lasting …
Turbulence Particle Acceleration and UHECR Open
The standard model to produce non-thermal particles is the particle acceleration at shocks. However, the photon spectra in high-energy objects, such as blazars, frequently show very hard feature, which seems inconsistent with the standard …
Cosmic rays escaping from Galactic starburst-driven superbubbles Open
We calculate spectra of escaping cosmic rays (CRs) accelerated at shocks produced by expanding Galactic superbubbles powered by multiple supernovae producing a continuous energy outflow in star-forming galaxies. We solve the generalized Ko…
Upscattered Cocoon Emission in Short Gamma-Ray Bursts as High-energy Gamma-Ray Counterparts to Gravitational Waves Open
We investigate prolonged engine activities of short gamma-ray bursts (SGRBs), such as extended and/or plateau emissions, as high-energy gamma-ray counterparts to gravitational waves (GWs). Binary neutron-star mergers lead to relativistic j…
Multimessenger tests of cosmic-ray acceleration in radiatively inefficient accretion flows Open
The cores of active galactic nuclei (AGNs) have been suggested as the sources of IceCube neutrinos, and recent numerical simulations have indicated that hot AGN coronae of Seyfert galaxies and radiatively inefficient accretion flows (RIAFs…
Limits on the Weak Equivalence Principle and Photon Mass with FRB 121102 Subpulses Open
Fast radio bursts (FRBs) are short-duration (∼millisecond) radio transients with cosmological origin. The simple sharp features of the FRB signal have been utilized to probe two fundamental laws of physics, namely, testing Einstein’s weak …
High-energy neutrino flux from individual blazar flares Open
Motivated by the recently reported evidence of an association between a high-energy neutrino and a γ-ray flare from the blazar TXS 0506+056, we calculate the expected high-energy neutrino signal from past, individual flares, from 12 blazar…