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37 papers · 1 filter
Evaluation of cluster expansions and correlated one-body properties of nuclei
Ch. C. Moustakidis, S. E. Massen, C. P. Panos +2
Three different cluster expansions for the evaluation of correlated one-body properties of s-p and s-d shell nuclei are compared. Harmonic oscillator wave functions and Jastrow typ…
Multi-electron SEFs for nuclear reactions involved in advanced stages of stellar evolution
Theodore E. Liolios
Multi-electron screening effects encountered in laboratory astrophysical reactions are investigated by considering the reactants Thomas-Fermi atoms. By means of that model, previou…
Astrophysical factors:Zero energy vs. Most effective energy
Theodore E. Liolios
Effective astrophysical factors for non-resonant astrophysical nuclear reaction are invariably calculated with respect to a zero energy limit. In the present work that limit is sho…
Axisymmetric Modes of Rotating Relativistic Stars in the Cowling Approximation
Jose A. Font, Harald Dimmelmeier, Anshu Gupta +1
Axisymmetric pulsations of rotating neutron stars can be excited in several scenarios, such as core-collapse, crust and core-quakes and binary mergers and could become detectable e…
Radial oscillations of relativistic stars
Kostas. D. Kokkotas, Johannes Ruoff
We present a new survey of the radial oscillation modes of neutron stars. This study complements and corrects earlier studies of radial oscillations. We present an extensive list o…
Hybrid Inflation and Supergravity
C. Panagiotakopoulos
Hybrid inflation is a natural scenario in the absence of supersymmetry. In the context of supergravity, however, it has to face the naturalness problems of the initial conditions a…
Nonlinear evolution of r-modes in rotating relativistic stars
Jose A. Font, Nikolaos Stergioulas
A numerical study of nonlinear r-modes in isentropic, rapidly rotating relativistic stars, via 3-D general-relativistic hydrodynamical evolutions, is presented. On dynamical timesc…
Supersymmetric Hybrid Inflation
G. Lazarides
The non-supersymmetric and supersymmetric versions of hybrid inflation are summarized. It is emphasized that supersymmetric hybrid inflation (with its extensions) is an extremely "…
The r-mode instability in rotating neutron stars
N. Andersson, K. D. Kokkotas
In this review we summarize the current understanding of the gravitational-wave driven instability associated with the so-called r-modes in rotating neutron stars. We discuss the n…
The heavy neutral Higgs signature in the gamma gamma to Z Z process
G. J. Gounaris, P. I. Porfyriadis, F. M. Renard
If the Standard Model (SM) Higgs particle is sufficiently heavy, then its contribution to gamma gamma to Z Z should be largely imaginary, interfering with the also predominantly im…
Pygmy dipole resonances in relativistic random phase approximation
D. Vretenar, N. Paar, P. Ring +1
The isovector dipole response in Pb is described in the framework of a fully self-consistent relativistic random phase approximation. The NL3 parameter set for the effectiv…
Relativistic Hartree-Bogoliubov description of sizes and shapes of A=20 isobars
G. A. Lalazissis, D. Vretenar, P. Ring
Ground-state properties of A = 20 nuclei (N, O, F, Ne, Na, Mg) are described in the framework of Relativistic Hartree-Bogoliubov (RHB) the…
Evolutionary Self-Energy-Loss Effects in Compact Binary Systems: Importance of Rapid Rotation and of Equation of State
N. K. Spyrou, N. Stergioulas
The spin-down of a millisecond pulsar in a compact binary system leads to self-energy losses, that cause the binary's orbital period to increase (the effect being of first post-New…
Atomic effects in astrophysical nuclear reactions
Theodore E. Liolios
Two models are presented for the description of the electron screening effects that appear in laboratory nuclear reactions at astrophysical energies. The two-electron screening ene…
Second Order Perturbations of a Macroscopic String; Covariant Approach
A. L. Larsen, A. Nicolaidis
Using a world-sheet covariant formalism, we derive the equations of motion for second order perturbations of a generic macroscopic string, thus generalizing previous results for fi…
Scattering of particles by neutron stars: Time-evolutions for axial perturbations
V. Ferrari, K. D. Kokkotas
The excitation of the axial quasi-normal modes of a relativistic star by scattered particles is studied by evolving the time dependent perturbation equations. This work is the firs…
The process γγ-> γγ, γZ, ZZ
G. J. Gounaris
The Standard Model contributions to the processes , and ZZ at sufficiently high energies, are found to be helicity conserving and almost purely imaginary. This is du…
Higgs Scalars in the Minimal Non-minimal Supersymmetric Standard Model
C. Panagiotakopoulos, A. Pilaftsis
We consider the simplest and most economic version among the proposed non-minimal supersymmetric models, in which the -parameter is promoted to a singlet superfield, whose all s…
Universal trend of the information entropy of a fermion in a mean field
C. P. Panos, S. E. Massen, C. G. Koutroulos
We calculate the information entropy of single-particle states in position-space and momentum-space for a nucleon in a nucleus, a particle in a hypernucleus and…
Monopoles, Axions and Intermediate Mass Dark Matter
G. Lazarides, Q. Shafi
We present a solution to the cosmological problem encountered in (supersymmetric) grand unified theories due to copious monopole production at the end of hybrid inflation. By emplo…
Phenomenology and Cosmology of Supersymmetric Grand Unified Theories
Constantinos Pallis
The cosmological relic density of a Bino-like Lightest Supersymmetric Particle is calculated in the framework of the Minimal Supersymmetric Standard Model. We include annihilation…
The process at a Collider
G. J. Gounaris, P. I. Porfyriadis
The helicity amplitudes for the process are studied to 1-loop order in the minimal SUSY (MSSM) model, where is the CP-odd Higgs particle. Simple exact analyti…
Nonlinear r-modes in Rapidly Rotating Relativistic Stars
Nikolaos Stergioulas, Jose A. Font
The r-mode instability in rotating relativistic stars has been shown recently to have important astrophysical implications (including the emission of detectable gravitational radia…
Search for solar Kaluza-Klein axions in theories of low-scale quantum gravity
L. Di Lella, A. Pilaftsis, G. Raffelt +1
We explore the physics potential of a terrestrial detector for observing axionic Kaluza-Klein excitations coming from the Sun within the context of higher-dimensional theories of l…