ar X iv : h ep - t h / 03 04 22 9 v 1 2 8 A pr 2 00 3 Nonlocal action for long - distance modifications of gravity theory
نویسنده
چکیده
We construct the covariant nonlocal action for recently suggested long-distance modifications of gravity theory motivated by the cosmological constant and cos-mological acceleration problems. This construction is based on the special non-local form of the Einstein-Hilbert action explicitly revealing the fact that this action within the covariant curvature expansion begins with curvature-squared terms.
منابع مشابه
ep - t h / 03 04 22 9 v 2 2 3 Ju n 20 03 Nonlocal action for long - distance modifications of gravity theory
We construct the covariant nonlocal action for recently suggested long-distance modifications of gravity theory motivated by the cosmological constant and cos-mological acceleration problems. This construction is based on the special non-local form of the Einstein-Hilbert action explicitly revealing the fact that this action within the covariant curvature expansion begins with curvature-squared...
متن کاملar X iv : h ep - p h / 03 04 15 1 v 1 1 5 A pr 2 00 3 Gluon Radiation and Parton Energy Loss
The propagation of hard partons through spatially extended matter leads to medium-modifications of their fragmentation pattern. Here, we review the current status of calculations of the corresponding medium-induced gluon radiation, and how this radiation affects hadronic observables at collider energies.
متن کاملar X iv : h ep - t h / 03 10 04 6 v 1 6 O ct 2 00 3 Boundary Action of N = 2 Super - Liouville Theory
We derive a boundary action of N = 2 super-Liouville theory which preserves both N = 2 supersymmetry and conformal symmetry by imposing explicitly T = T and G = G. The resulting boundary action shows a new duality symmetry.
متن کاملar X iv : h ep - t h / 03 04 01 9 v 1 2 A pr 2 00 3 GNPHE / 03 - 05 On N = 1 gauge models from geometric engineering in M - theory
We study geometric engineering of four-dimensional N = 1 gauge models from M-theory on a seven-dimensional manifold with G 2 holonomy. The manifold is constructed as a K3 fibration over a three-dimensional base space with ADE geometry. The resulting gauge theory is discussed in the realm of (p, q) webs. We discuss how the anomaly cancellation condition translates into a condition on the associa...
متن کاملar X iv : h ep - t h / 04 04 18 8 v 1 2 3 A pr 2 00 4 CERN - PH - TH / 2004 - 048 hep - th / 0404188 STRING THEORY
This is a rendering of a review talk on the state of String Theory, given at the EPS-2003 Conference, intended for a wide audience of experimental and theoretical physicists. It emphasizes general ideas rather than technical aspects.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003