Results 11  20
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529
Gravitational astrophysics
"... We have known for some time that, like the surface of a busy swimming pool, spacetime is awash with waves generated by the local and distant motions of mass and that, in principle, much of this activity can be reconstructed by analysing the waveforms. However, instrumentation with a reasonable chanc ..."
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answer a wide range of astrophysical questions from neutron star physics to cosmology. The next generation of groundbased telescopes should be able to make extensive gravitational observations of some of the more energetic events in our local Universe. Looking only slightly further ahead, the space
HardPhoton Production and Tests of QED at LEP
"... The total and di#erential cross sections of the process e + e  # n# with n # 2 are measured using data collected by the L3 experiment at centreofmass energies of # s = 183 and 189 GeV. The results are in agreement with the Standard Model expectations. Limits are set on deviations from QED ..."
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be selected with negligible background. Therefore, this process is well suited to test QED and to look for new physics phenomena, whose expected contributions grow with the increase of the centreofmass energy, # s. In this paper, the results on the study of the process e + e  # n# (n # 2
DATE CHANGE THE ONELOOP QED IN NONCOMMUTATIVE SPACE
, 2003
"... Returning to the old problems in ordinary QED,by an appropriate extension of the dimensional regularization method in noncommutative space we try to provide a quite coherent look into NCQED.The renormalisation of theories, the β function,the vacuum polarisation of photon,the general structure of ver ..."
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Returning to the old problems in ordinary QED,by an appropriate extension of the dimensional regularization method in noncommutative space we try to provide a quite coherent look into NCQED.The renormalisation of theories, the β function,the vacuum polarisation of photon,the general structure
LANDAU SINGULARITY AND THE INSTABILITY OF VACUUM STATE IN QED
, 2003
"... In this paper we argue that the Landau singularity of the coupling constant in QED reflects the instability of the vacuum state, in other words the perturbative ground state of QED. We do not have a rigorous mathematical proof. We rather provide strong arguments derived from the theory of stability ..."
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In this paper we argue that the Landau singularity of the coupling constant in QED reflects the instability of the vacuum state, in other words the perturbative ground state of QED. We do not have a rigorous mathematical proof. We rather provide strong arguments derived from the theory of stability
Selfgravitating fundamental strings and blackholes
 Nucl. Phys, B
"... The configuration of typical highly excited (M ≫ Ms ∼ (α ′ ) −1/2) string states is considered as the string coupling g is adiabatically increased. The size distribution of very massive single string states is studied and the mass shift, due to longrange gravitational, dilatonic and axionic attract ..."
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The configuration of typical highly excited (M ≫ Ms ∼ (α ′ ) −1/2) string states is considered as the string coupling g is adiabatically increased. The size distribution of very massive single string states is studied and the mass shift, due to longrange gravitational, dilatonic and axionic
Oneloop corrections to the photon propagator in the curvedspace QED
, 906
"... Abstract. We calculate and discuss the oneloop corrections to the photon sector of QED interacting to a background gravitational field. At high energies the fermion field can be taken as massless and the quantum terms can be obtained by integrating conformal anomaly. We present a covariant local ex ..."
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Abstract. We calculate and discuss the oneloop corrections to the photon sector of QED interacting to a background gravitational field. At high energies the fermion field can be taken as massless and the quantum terms can be obtained by integrating conformal anomaly. We present a covariant local
Atom interferometers for gravitational wave detection: a look at a “simple ” configuration
"... Abstract A symmetric RamseyBordé (MachZehnder geometry) atom interferometer is studied as gravitational wave detector under the hypothesis of shot noise limited sensitivity. Full gaugeinvariant response function is deduced via ABCD matrices approach and the resulting sensitivity is analyzed in ..."
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Abstract A symmetric RamseyBordé (MachZehnder geometry) atom interferometer is studied as gravitational wave detector under the hypothesis of shot noise limited sensitivity. Full gaugeinvariant response function is deduced via ABCD matrices approach and the resulting sensitivity is analyzed
ScalarQED βfunctions near Planck’s Scale a.
, 1998
"... The Renormalization Group Flow Equations of the ScalarQED model near Planck’s scale are computed within the framework of the average effective action. Exact Flow Equations, corrected by Einstein Gravity, for the running selfinteracting scalar coupling parameter and for the running v.e.v. of φ ∗ φ, ..."
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The Renormalization Group Flow Equations of the ScalarQED model near Planck’s scale are computed within the framework of the average effective action. Exact Flow Equations, corrected by Einstein Gravity, for the running selfinteracting scalar coupling parameter and for the running v.e.v. of φ ∗ φ
Neutrino Oscillations in Strong Gravitational
, 1996
"... Neutrino oscillations in the presence of strong gravitational fields are studied. We look at very high energy neutrinos (∼1 TeV) emanating from Active Galactic Nuclei (AGN). It is observed that spin flavor resonant transitions of such neutrinos may occur in the vicinity of AGN due to gravitational e ..."
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Neutrino oscillations in the presence of strong gravitational fields are studied. We look at very high energy neutrinos (∼1 TeV) emanating from Active Galactic Nuclei (AGN). It is observed that spin flavor resonant transitions of such neutrinos may occur in the vicinity of AGN due to gravitational
AGAPE: Gravitational microlensing effect to look for MACHOs towards M31
, 2001
"... on behalf of POINTAGAPE collaboration b ..."
Results 11  20
of
529