Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Can a Large Neutron Excess Help Solve the Baryon Loading Problem in Gamma-Ray Burst Fireballs?
 

Summary: Can a Large Neutron Excess Help Solve the Baryon Loading Problem
in Gamma-Ray Burst Fireballs?
George M. Fuller, Jason Pruet and Kevork Abazajian
Department of Physics, University of California, San Diego, La Jolla, California 92093-0319
(April 21, 2000)
We point out that the baryon-loading problem in Gamma-Ray Burst (GRB) models can be ame-
lioriated if a signi cant fraction of the baryons which inertially con ne the reball are converted to
neutrons. A high neutron fraction in some circumstances can result in a reduced transfer of energy
from relativistic light particles in the reball to baryons. The energy needed to produce the required
relativistic ow in the GRB is consequently reduced, in some cases by orders of magnitude. This
could be relevant to GRB models because a high neutron-to-proton ratio has been calculated in
neutron star-merger reball environments. Signi cant neutron excess also could occur near compact
objects with high neutrino uxes.
PACS numbers: 98.70.Rz, 14.60.Pq
In this Letter we show how the baryon loading prob-
lem can be alleviated in certain gamma-ray burst (GRB)
models when signi cant numbers of baryons are convert-
ed to neutrons. Interestingly, many of the proposed GR-
B \central engines" involve compact objects which are
themselves highly neutronized, or which are accompanied

  

Source: Abazajian, Kev - Theoretical Astrophysics, Fermilab

 

Collections: Physics