Zobrazeno 1 - 10
of 4 257
pro vyhledávání: '"Pe'Er, A."'
Autor:
Vyas, Mukesh Kumar, Pe'er, Asaf
We explore a new mechanism for photon energy gain in a relativistic plasma with velocity shear. This process takes place in optically thick plasma and resembles conventional Fermi acceleration, where photons undergo multiple scatterings between regio
Externí odkaz:
http://arxiv.org/abs/2410.05089
Positive spectral lags are commonly observed in gamma-ray burst (GRB) prompt phase where soft photons lag behind hard ones in their spectral studies. Opposite to this pattern, a fraction of GRBs show a negative spectral lag where hard photons arrive
Externí odkaz:
http://arxiv.org/abs/2410.04446
Decision trees (DTs) and their random forest (RF) extensions are workhorses of classification and regression in Euclidean spaces. However, algorithms for learning in non-Euclidean spaces are still limited. We extend DT and RF algorithms to product ma
Externí odkaz:
http://arxiv.org/abs/2410.13879
The prompt phase X- and $\gamma$-ray light curves of gamma-ray bursts (GRBs) exhibit erratic and complex behaviour, often with multiple pulses. The temporal shape of individual pulses is often modelled as 'fast rise exponential decay' (FRED). Here, w
Externí odkaz:
http://arxiv.org/abs/2409.17860
Autor:
Pe'er, Asaf, Zhang, Bing
The brightest of all time (BOAT) GRB221009A show evidence for a narrow, evolving MeV emission line. Here, we show that this line can be explained as due to pair annihilation in the prompt emission region, and that its temporal evolution is naturally
Externí odkaz:
http://arxiv.org/abs/2407.16241
Autor:
Pe'er, Asaf, Ryde, Felix
Progenitor stars of long gamma-ray bursts (GRBs) could be surrounded by a significant and complex nebula structure lying at a parsec scale distance. After the initial release of energy from the GRB jet, the jet will interact with this nebula environm
Externí odkaz:
http://arxiv.org/abs/2406.03841
Autor:
Yang, Hanming, Moretti, Antonio Khalil, Macaluso, Sebastian, Chlenski, Philippe, Naesseth, Christian A., Pe'er, Itsik
Reconstructing jets, which provide vital insights into the properties and histories of subatomic particles produced in high-energy collisions, is a main problem in data analyses in collider physics. This intricate task deals with estimating the laten
Externí odkaz:
http://arxiv.org/abs/2406.03242
Cross-validation is a common method for estimating the predictive performance of machine learning models. In a data-scarce regime, where one typically wishes to maximize the number of instances used for training the model, an approach called "leave-o
Externí odkaz:
http://arxiv.org/abs/2406.01652
Autor:
Bret, Antoine, Pe'er, Asaf
Despite being studied for many years, the structure of collisionless shocks is still not fully determined. Such shocks are known to be accelerators of cosmic rays, which, in turn, modify the shock structure. The shock width $\lambda$ is known to be c
Externí odkaz:
http://arxiv.org/abs/2405.08155
Autor:
Haviv, Doron, Kunes, Russell Zhang, Dougherty, Thomas, Burdziak, Cassandra, Nawy, Tal, Gilbert, Anna, Pe'er, Dana
Optimal transport (OT) and the related Wasserstein metric (W) are powerful and ubiquitous tools for comparing distributions. However, computing pairwise Wasserstein distances rapidly becomes intractable as cohort size grows. An attractive alternative
Externí odkaz:
http://arxiv.org/abs/2404.09411