Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Gromes, Dieter"'
Autor:
Gromes, Dieter
We calculate the energy radiated coherently by a system of $N$ charged non relativistic particles. It disagrees with the energy loss which is obtained if one employs the Lorentz Abraham Dirac (LAD) equation for each particle, and sums up the contribu
Externí odkaz:
http://arxiv.org/abs/1507.05736
Autor:
Gromes, Dieter, Thommes, Eduard
We derive the radiation reaction by taking into account that the acceleration of the charge is caused by the interaction with some heavy source particle. In the non relativistic case this leads, in contrast to the usual approach, immediately to a res
Externí odkaz:
http://arxiv.org/abs/1403.1162
Autor:
Gromes, Dieter
We define a class of "optimal" coordinate systems by requiring that the deviation from an exact Robertson-Walker metric is "as small as possible" within a given four dimensional volume. The optimization is performed by minimizing several volume integ
Externí odkaz:
http://arxiv.org/abs/1111.5823
Autor:
Gromes, Dieter
We generalize and simplify an earlier approach. In three dimensions we present the most general averaging formula in lowest order which respects the requirements of covariance. It involves a bitensor, made up of a basis of six tensors, and contains t
Externí odkaz:
http://arxiv.org/abs/0907.2629
Autor:
Gromes, Dieter
We present an explicit averaging formula in lowest order. Besides an arbitrary smearing function it contains two integrals of this function. This is necessary in order to achieve covariance. There is no need to solve any equations. In three dimension
Externí odkaz:
http://arxiv.org/abs/0904.4213
Autor:
Gromes, Dieter
Publikováno v:
Eur.Phys.J.C36:169-175,2004
Using a four dimensional approach, we show that the singularities for small gluon momenta, which arise in the usual three dimensional treatment of the annihilation decay, disappear if all poles in the relative energy are taken into account correctly
Externí odkaz:
http://arxiv.org/abs/hep-ph/0403290
Publikováno v:
Phys.Lett.B576:314-327,2003
We discuss the constraints induced by the algebra of the Poincare' generators on non-relativistic effective field theories. In the first part we derive some relations among the matching coefficients of the HQET (and NRQCD), which have been formerly o
Externí odkaz:
http://arxiv.org/abs/hep-ph/0306107
Autor:
Gromes, Dieter
Publikováno v:
Eur.Phys.J.C30:233-240,2003
Starting with two coupled Bethe-Salpeter equations for the quark-antiquark, and for the quark-glue-antiquark component of the quarkonium, we solve the bound state equations perturbatively. The resulting admixture of glue can be partially understood i
Externí odkaz:
http://arxiv.org/abs/hep-ph/0304224
Publikováno v:
Phys.Rev.D64:076010,2001
We derive and discuss the constraints induced by Poincare' invariance on the form of the heavy-quark potential up to order 1/m^2. We present two derivations: one uses general arguments directly based on the Poincare' algebra and the other follows fro
Externí odkaz:
http://arxiv.org/abs/hep-ph/0104068
Autor:
Gromes, Dieter
Publikováno v:
Eur.Phys.J.C12:479-488,2000
We extend the approach of Banks, Myerson, and Kogut for the calculation of the Wilson loop in lattice U(1) to the non-abelian SU(2) group. The original degrees of freedom of the theory are integrated out, new degrees of freedom are introduced in seve
Externí odkaz:
http://arxiv.org/abs/hep-lat/9908042