383 citations · 1.3k across the 39 of their papers we have counts for
39 papers
Potential periodic signals in blazars: significance, forecasting and deep learning
M. A. Hashad, A. Hammad, Amr A. EL-Zant
Blazars exhibit variable emission on diverse timescales. Some light curves show signs of quasiperiodic oscillations (QPOs), which may encode clues regarding the physical processes…
Clustered unified dark sector cosmology: Background evolution and linear perturbations in light of observations
Mahmoud Hashim, Amr El-Zant
We consider unified dark sector models in which the fluid can collapse and cluster into halos, allowing for hierarchical structure formation to proceed as in standard cosmology. We…
Quasi-periodic -ray modulations in the blazars PKS 2155-83 and PKS 2255-282
M. A. Hashad, Amr A. El-Zant, Y. Abdou +1
While there has been an increase in interest in the possibility of quasi-periodic oscillations (QPOs) in blazars, the search has hitherto been restricted to sources with well-sampl…
Building stellar bulges and halo cores from massive clumps observed in the DYNAMO-HST sample
Mahmoud Hashim, Amr El-Zant, Antonino Del popolo
We present N-body simulations of the process of bulge formation in disc galaxies due to inward migration of massive stellar clumps. The process is accompanied by dark halo heating,…
Halo heating from fluctuating gas in a model dwarf
Mahmoud Hashim, Amr El-Zant, Jonathan Freundlich +2
The cold dark matter (CDM) structure formation scenario faces challenges on (sub)galactic scales, central among them being the `cusp-core' problem. A known remedy, driving CDM out…
Facilitating Non-HEP Career Transition
Sudhir Malik, Aneliya Karadzhinova-Ferrer, Julie Hogan +7
About two-third of Physics PhDs establish careers outside of academia and the national laboratories in areas like Software, Instrumentation, Data Science, Finance, Healthcare, Jour…