David Eichler
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View article: Luminosity selection for gamma-ray bursts
Luminosity selection for gamma-ray bursts Open
Aims. There exists inevitable scatter in the intrinsic luminosity of gamma-ray bursts (GRBs). If there is relativistic beaming in the source, viewing angle variation necessarily introduces variation in the intrinsic luminosity function (IL…
View article: GRB prompt phase spectra under backscattering dominated model
GRB prompt phase spectra under backscattering dominated model Open
We propose a backscattering dominated prompt emission model for gamma-ray bursts (GRB) prompt phase in which the photons generated through pair annihilation at the centre of the burst are backscattered through Compton scattering by an outf…
View article: Zero Traffic Conflict (ZTC) Road Networks with Concentric Traffic Paths
Zero Traffic Conflict (ZTC) Road Networks with Concentric Traffic Paths Open
U-turns and left turns are sometimes forbidden even though it increases travel distances. The greater travel distances are sometimes outweighed by the improved movement through intersections due to there being fewer conflicting lanes of tr…
View article: Differential Source Count for Gamma-Ray Bursts
Differential Source Count for Gamma-Ray Bursts Open
Different forms of long gamma-ray burst (GRB) luminosity functions are considered on the basis of an explicit physical model. The inferred flux distributions are compared with the observed ones from two samples of GRBs, Swift and Fermi GBM…
View article: Photon-dominated Hydrodynamics
Photon-dominated Hydrodynamics Open
Some subtle distinctions between optically thin emission and optically thick emission (with a dynamically passive source of opacity) from an emitting surface are drawn. It is noted that photons may escape a region of high optical depth by …
View article: Diffuse galactic Gamma-rays from star clusters
Diffuse galactic Gamma-rays from star clusters Open
We demonstrate that young star clusters have a γ-ray surface brightness comparable to that of the diffuse Galactic emission (DGE), and estimate that their sky coverage in the direction of the inner Galaxy exceeds unity. We therefore sugges…
View article: Realistic modelling of wind and supernovae shocks in star clusters: addressing 22Ne/20Ne and other problems in Galactic cosmic rays
Realistic modelling of wind and supernovae shocks in star clusters: addressing 22Ne/20Ne and other problems in Galactic cosmic rays Open
Cosmic ray (CR) sources leave signatures in the isotopic abundances of CRs. Current models of Galactic CRs that consider supernovae (SNe) shocks as the main sites of particle acceleration cannot satisfactorily explain the higher 22Ne/20Ne …
View article: A Summary of Multimessenger Science with Neutron Star Mergers
A Summary of Multimessenger Science with Neutron Star Mergers Open
The white paper discusses the breadth of science that is possible with multimessenger observations of neutron star mergers. It then makes recommendations for the next decade, then beyond, to be sure we capture this science.
View article: A Summary of Multimessenger Science with Neutron Star Mergers
A Summary of Multimessenger Science with Neutron Star Mergers Open
Neutron star mergers, referring to both binary neutron star and neutron star black hole mergers, are the canonical multimessenger events. They have been detected across the electromagnetic spectrum, have recently been detected in gravitati…
View article: Multiply imaged time-varying sources behind galaxy clusters
Multiply imaged time-varying sources behind galaxy clusters Open
With upcoming (continuum) surveys of high-resolution radio telescopes, detection rates of fast radio bursts (FRBs) might approach 10 5 per sky per day by future extremely large observatories, such as the possible extension of the Square Ki…
View article: Short Gamma-Ray Bursts Viewed from Far Off-axis
Short Gamma-Ray Bursts Viewed from Far Off-axis Open
The recent radio observations of a superluminal radio afterglow following gamma-ray burst (GRB) 170817A are interpreted in terms of a jet impacting a baryonic cloak, which is presumably the material caught at the front of the jet as the la…
View article: Multiply-imaged time-varying sources behind galaxy clusters - Comparing FRBs to QSOs, SNe, and GRBs
Multiply-imaged time-varying sources behind galaxy clusters - Comparing FRBs to QSOs, SNe, and GRBs Open
With upcoming (continuum) surveys of high-resolution radio telescopes, detection rates of fast radio bursts (FRBs) might approach $10^5$ per sky per day by future extremely large observatories, such as the possible extension of the Square …
View article: Time variability of TeV cosmic ray sky map
Time variability of TeV cosmic ray sky map Open
The variation in the intensity of cosmic rays at small angular scales is\nattributed to the interstellar turbulence in the vicinity of the Solar system.\nWe show that {a turbulent origin of the small-scale structures implies that}\nthe mor…
View article: Observing Cosmological Processes in Real Time with Repeating Fast Radio Bursts
Observing Cosmological Processes in Real Time with Repeating Fast Radio Bursts Open
It is noted that the duration of a fast radio burst (FRB), about 10 −3 s, is a smaller fraction of the time delay between multiple images of a source gravitationally lensed by a galaxy or galaxy cluster than the human lifetime is to the ag…
View article: Urine volatile organic compounds composition in mice bearing breast and melanoma tumors: effect of low-protein diet
Urine volatile organic compounds composition in mice bearing breast and melanoma tumors: effect of low-protein diet Open
Background: Volatile organic compounds (VOCs) in urine may provide information about biomarkers of tumors in their early stages and about tumor growth. Methods: This study demonstrates that the effect of low protein diet on the pattern of …
View article: Testing the Viewing Angle Hypothesis for Short GRBs with LIGO Events
Testing the Viewing Angle Hypothesis for Short GRBs with LIGO Events Open
It has been suggested that short gamma-ray bursts (GRBs) have shorter or undetectable spectral lags than longer GRBs because for the former, the observer's line of sight makes a larger angle with the GRB jet axis than it does for the latte…
View article: Nanolensed Fast Radio Bursts
Nanolensed Fast Radio Bursts Open
It is suggested that fast radio bursts can probe gravitational lensing by clumpy dark matter objects that range in mass from 10 −3 M ⊙ –10 2 M ⊙ . They may provide a more sensitive probe than observations of lensings of objects in the Mage…
View article: Lack of thermal energy in superbubbles: hint of cosmic rays?
Lack of thermal energy in superbubbles: hint of cosmic rays? Open
Using analytic methods and $1$-D two-fluid simulations, we study the effect of cosmic rays (CRs) on the dynamics of interstellar superbubbles (ISBs) driven by multiple supernovae (SNe)/stellar winds in OB associations. In addition to CR ad…
View article: ELECTRON HEATING IN A RELATIVISTIC, WEIBEL-UNSTABLE PLASMA
ELECTRON HEATING IN A RELATIVISTIC, WEIBEL-UNSTABLE PLASMA Open
The dynamics of two initially unmagnetized relativistic counter-streaming homogeneous ion-electron plasma beams are simulated in two dimensions using the particle-in-cell (PIC) method. It is shown that current filaments, which form due to …
View article: Ultrahigh Energy Cosmic Rays, The Diffuse High Energy Gamma Ray Background and Anti-protons
Ultrahigh Energy Cosmic Rays, The Diffuse High Energy Gamma Ray Background and Anti-protons Open
Theories for the origin of ultrahigh energy cosmic rays (UHECR) may imply a significant diffuse background in secondary $\gamma$-rays from the pair cascads the UHECR initiate when interacting with background light. It is shown that, becaus…
View article: Do Galactic Antiprotons Come from Decaying Dark Matter?
Do Galactic Antiprotons Come from Decaying Dark Matter? Open
It is shown that the antiproton spectrum reported by the AMS02 collaboration can be accounted for by dark matter (DM) decay if the residence time in the Galactic halo is of order 90 Myr. The DM lifetime assumed, $ 5 \cdot 10^{27}$ s for DM…
View article: ULTRAHIGH ENERGY COSMIC RAYS: A GALACTIC ORIGIN?
ULTRAHIGH ENERGY COSMIC RAYS: A GALACTIC ORIGIN? Open
It is suggested that essentially all UHECRs we detect, including those at the highest energies, originate in our Galaxy. It is shown that even if the density of sources decreases with Galactic radius, then the anisotropy and composition ca…