10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- European Organization for Nuclear ResearchCH2.4k papers
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- University of IowaUS2.3k papers
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42 papers · 1 filter
Nonlinear Prediction of Solar Cycle 24
A. Kilcik, C. N. K. Anderson, J. P. Rozelot +3
Sunspot activity is highly variable and challenging to forecast. Yet forecasts are important, since peak activity has profound effects on major geophysical phenomena including spac…
On the nature of gravitational forces
A. Del Popolo
In this paper I show how the statistics of the gravitational field is changed when the system is characterized by a non-uniform distribution of particles. I show how the distributi…
Dark matter and structure formation a review
Antonino Del Popolo
This paper provides a review of the variants of dark matter which are thought to be fundamental components of the universe and their role in origin and evolution of structures and…
Some improvements to the spherical collapse model
Antonino Del Popolo
I study the joint effect of dynamical friction, tidal torques and cosmological constant on clusters of galaxies formation I show that within high-density environments, such as rich…
Possible evolution of dim radio quiet neutron star 1E 1207.4-5209 based on a B-decay model
Askin Ankay, Arzu M. Ankay, E. Nihal Ercan
Dim radio-quiet neutron star (DRQNS) 1E 1207.4-5209 is one of the most heavily examined isolated neutron stars. Wide absorption lines were observed in its spectrum obtained by both…
Magnetospheric particle acceleration and X-ray emission of pulsars
Sevinc O. Tagieva, Askin Ankay, Arzu M. Ankay
The available data on isolated X-ray pulsars, their wind nebulae, and the supernova remnants which are connected to some of these sources are analyzed. It is shown that electric fi…
Gravitational collapse and non-self similarity in the L-T relation
A. Del Popolo
We derive the luminosity-temperature relation for clusters of galaxies by means of a modification of the self-similar model to take account of angular momentum acquisition by proto…
On the cosmological mass function theory
A. Del Popolo
This paper provides, from one side, a review of the theory of the cosmological mass function from a theoretical point of view, starting from the seminal paper of Press & Shechter (…
Evolution of the cosmological mass function in a moving barrier model
A. Del Popolo
I calculate the mass function evolution in a CDM model by means of the excursion set model and an improved version of the barrier shape obtained in Del Popolo & Gambera (1998),…
On the Average Comoving Number Density of Halos
A. Del Popolo
I compare the numerical multiplicity function given in Yahagi, Nagashima & Yoshii (2004) with the theoretical multiplicity function obtained by means of the excursion set model and…
Optical and Infrared Emission from the AXPs and SGRs
Unal Ertan, Sirin Caliskan
We show that the irradiated accretion disk model can account for all the optical and infrared observations of the anomalous X-ray pulsars in the persistent state. Model fits do not…
Constraints on cosmological parameters through clusters XLF and XTF
A. Del Popolo, N. Ercan
In this paper, I revisit the constraints obtained by several authors (Reichart et al. 1999; Eke et al. 1998; Henry 2000) on the estimated values of , and in th…
Orbital migration and the period distribution of exoplanets
A. Del Popolo
We use the model for the migration of planets introduced in Del Popolo, Yesilyurt & Ercan (2003) to calculate the observed mass and semimajor axis distribution of extra-solar plane…
A theoretical study of the luminosity temperature relation for clusters of galaxies
A. Del Popolo, N. Hiotelis, J. Penarrubia
A luminosity-temperature relation for clusters of galaxies is derived. The two models used, take into account the angular momentum acquisition by the proto-structures during their…
Cosmological constraints from clustering properties of galaxy clusters
A. Del Popolo, N. Ercan, S. Yesilyurt
In this paper, we discuss improvements of the Suto et al. (2000) model, in the light of recent theoretical developments (new theoretical mass functions, a more accurate mass-temper…
On the reliability of merger-trees and the mass growth histories of dark matter haloes
N. Hiotelis, A. Del Popolo
We have used merger trees realizations to study the formation of dark matter haloes. The construction of merger-trees is based on three different pictures about the formation of st…
On the Rotational Dynamics of Magnetically Threaded Disks around Neutron Stars
M. Hakan Erkut, M. Ali Alpar
We investigate the rotational dynamics of disk accretion around a strongly magnetized neutron star with an aligned dipole field. The magnetospheric field is assumed to thread the d…
Early phases of different types of isolated neutron star
A. Ankay, E. Yazgan, S. Sahin +1
Two Galactic isolated strong X-ray pulsars seem to be in the densest environments compared to other types of Galactic pulsar. X-ray pulsar J1846-0258 can be in an early phase of an…
On Bode's law
R. Bass, A. Del Popolo
In a planetary or satellite system, idealized as n small bodies in initially coplanar, concentric orbits around a large central body, obeying Newtonian point-particle mechanics, re…
Constraints to cosmological parameters through clusters evolution
A. Del Popolo, N. Ercan
In this paper, I revisit the constraints obtained by several authors (Reichart et al. 1999; Eke et al. 1998; Henry 2000) on the estimated values of Omegam, n and sigma_8 in the lig…
Improvements in the M-T relation and mass function and the measured Omega_m through clusters evolution
A. Del Popolo
In this paper, I revisit the constraints obtained by several authors (Reichart et al. 1999; Eke et al. 1998; Henry 2000) on the estimated values of Omega_m, n and sigma_8 in the li…
Birth rates of different types of neutron star and possible evolutions of these objects
Oktay H. Guseinov, Askin Ankay, Sevinc O. Tagieva
We estimate the spatial densities of different types of neutron star near the Sun. It is shown that the distances of dim isolated thermal neutron stars must be on average about 300…
Thin Disk Models of Anomalous X-ray Pulsars
K. Yavuz Ekşi, M. Ali Alpar
We discuss the options of the fall-back disk model of Anomalous X-Ray Pulsars (AXPs). We argue that the power-law index of the mass inflow rate during the propeller stage can be lo…
Can Thin Disks Produce Anomalous X-Ray Pulsars?
K. Yavuz Eksi, M. Ali Alpar
We investigate whether young neutron stars with fall-back disks can produce Anomalous X-Ray Pulsars (AXPs) within timescales indicated by the ages of associated supernova remnants.…