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Referencia bibliográfica
The Astrophysical Journal Supplement Series, Volume 232, Issue 1, article id. 9, 17 pp. (2017).
Fecha de publicación:
9
2017
Número de citas
36
Número de citas referidas
27
Descripción
Spontaneous breaking of Lorentz symmetry at energies on the order of the
Planck energy or lower is predicted by many quantum gravity theories,
implying non-trivial dispersion relations for the photon in vacuum.
Consequently, gamma-rays of different energies, emitted simultaneously
from astrophysical sources, could accumulate measurable differences in
their time of flight until they reach the Earth. Such tests have been
carried out in the past using fast variations of gamma-ray flux from
pulsars, and more recently from active galactic nuclei and gamma-ray
bursts. We present new constraints studying the gamma-ray emission of
the galactic Crab Pulsar, recently observed up to TeV energies by the
Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) collaboration. A
profile likelihood analysis of pulsar events reconstructed for energies
above 400 GeV finds no significant variation in arrival time as their
energy increases. Ninety-five percent CL limits are obtained on the
effective Lorentz invariance violating energy scale at the level of
{E}{{QG}1}> 5.5× {10}17 {GeV}
(4.5× {10}17 {GeV}) for a linear, and
{E}{{QG}2}> 5.9× {10}10 {GeV}
(5.3× {10}10 {GeV}) for a quadratic scenario, for the
subluminal and the superluminal cases, respectively. A substantial part
of this study is dedicated to calibration of the test statistic, with
respect to bias and coverage properties. Moreover, the limits take into
account systematic uncertainties, which are found to worsen the
statistical limits by about 36%–42%. Our constraints would have
been much more stringent if the intrinsic pulse shape of the pulsar
between 200 GeV and 400 GeV was understood in sufficient detail and
allowed inclusion of events well below 400 GeV.
Proyectos relacionados
Astrofísica de Partículas
El Grupo de Astrofísica de Partículas del IAC participa activamente en tres grandes colaboraciones internacionales de astrofísica de muy altas energías: AMS (Alpha Magnetic Spectrometer), los telescopios de radiación Cherenkov MAGIC I y II, y el Cherenkov Telescope Array (CTA). AMS es un detector de partículas diseñado para operar en el espacio, a
Ramón
García López