Results 31 to 40 of about 6,020,151 (174)

Aharonov–Bohm Effect for Cooper Pairs in Kerr Spacetime: Gravitomagnetic Phase Shifts From Frame Dragging

open access: yesAnnalen der Physik, Volume 538, Issue 8, August 2026.
ABSTRACT The unification of quantum mechanics and general relativity remains a central problem in fundamental physics. Here, we study the gravitomagnetic Aharonov–Bohm (AB) effect for Cooper pairs in Kerr spacetime. Frame‐dragging by a rotating black hole (BH) generates an effective vector potential through the off‐diagonal metric term gtϕ$g_{t\phi }$,
Erdem Sucu, İzzet Sakallı
wiley   +1 more source

The Search For Pulsar Wind Nebulae in the Very High Energy Gamma-ray Regime [PDF]

open access: yes, 2010
The aim of this Thesis is to study the development of pulsar wind nebulae in the TeV regime and in doing so uncover more sources which have as yet not been observed at these wavelengths.
KEOGH, DOMINIC,ROBERT   +1 more
core  

Dark Matter Signals in the gamma-ray sky

open access: yesEPJ Web of Conferences, 2014
Detection of gamma rays and cosmic rays from the annihilation or decay of dark matter particles is a promising method for identifying dark matter, understanding its intrinsic properties, and mapping its distribution in the universe.
Morselli Aldo
doaj   +1 more source

Upper limit on the axion-photon coupling from Markarian 421

open access: yesPhysics Letters B
Markarian421 is a well-known nearby BL Lac blazar at the redshift z=0.031. Many previous works were investigated to constrain the axion-photon coupling from its TeV gamma-ray observations, showing the upper limit on the coupling constant gaγ≲2.0×10−11GeV−
Hai-Jun Li, Wei Chao, Yu-Feng Zhou
doaj   +1 more source

Terrestrial Gamma‐Ray Flash Following Intense Negative Return Stroke Observed With BIMAP‐3D

open access: yesJournal of Geophysical Research: Atmospheres, Volume 131, Issue 13, 16 July 2026.
Abstract We report ground‐based observations of a terrestrial gamma‐ray flash (TGF) associated with a strong negative cloud‐to‐ground lightning strike (‐CG) which occurred near Los Alamos National Laboratory (LANL) in New Mexico, USA. Gamma photons were detected by the Terrestrial High‐energy Observations of Radiation (THOR) instrument, developed at ...
Daniel P. Jensen   +4 more
wiley   +1 more source

The first scientific experiment using Global e-VLBI observations: a multiwavelength campaign on the gamma-ray Narrow-Line Seyfert 1 PMN J0948+0022 [PDF]

open access: yes, 2010
The detection of gamma-ray emission by Fermi-LAT from the radio loud Narrow Line Seyfert 1 PMN J0948+0022 (Abdo et al. 2009, ApJ 699, 976) triggered a multi-wavelength campaign between March and July 2009. Given its high compactness (Doi et al.
Paragi, Zsolt   +16 more
core  

The Source Brightness Distribution of Terrestrial Gamma‐Ray Flashes From the ALOFT Flight Campaign

open access: yesJournal of Geophysical Research: Atmospheres, Volume 131, Issue 6, 28 March 2026.
Abstract Terrestrial Gamma‐ray Flashes (TGFs) are naturally occurring phenomena that consist of bursts of gamma radiation associated with thunderclouds. Measurements of TGFs have been predominantly based on satellite instruments due to the significantly larger observation area compared to ground measurements. Due to atmospheric attenuation of the gamma
A. N. Fuglestad   +15 more
wiley   +1 more source

Gamma ray Cerenkov telescope image analysis [PDF]

open access: yes, 1997
The subject of this thesis is ground based gamma ray astronomy using the imaging atmospheric Cerenkov technique. The first two chapters are introductory, and describe the field of gamma ray astronomy, the generation of extensive air showers in the ...
Holder, J., Holder, Jamie
core  

The Fermi Gamma-Ray Burst Monitor: Results from the first year and spectral analysis of GRB 090323 and GRB 090328

open access: yes, 2010
In the first year since the launch of the Fermi Observatory, the Gamma-ray Burst Monitor (GBM) has detected over 250 gamma-ray bursts (GRBs). Besides GRBs, GBM has triggered on other transient sources, such as soft gamma-ray repeaters and terrestrial ...
The Fermi GBM Team, BISSALDI, ELISABETTA
core   +1 more source

On the Gamma-Ray Emission of the Andromeda Galaxy M31

open access: yesThe Astrophysical Journal Letters, 2023
Using the γ -ray data obtained with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope (Fermi) for ∼14 yr, we examine the high-energy emission emanating from the center of the Andromeda galaxy M31.
Yi Xing   +3 more
doaj   +1 more source

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