A bstract Ambitwistor strings are chiral (holomorphic) whose target is the space of complex null geodesics, ambitwistor space. We introduce twistor representations in 6 and 5 dimensions. In 6d representation naturally conformally invariant. Anomaly cancellation leads to models that describe biadjoint scalar amplitudes certain invariant gauge gravity theories, respectively 4 th order. There thre...

We consider the role of quantum effects, mainly, Weyl anomaly in modifying FLRW model singular behavior at early times. Weyl anomaly corrections to FLRWmodels have been considered in the past, here we reconsider this model and show the following: The singularity of this model is weak according to Tipler and Krolak, therefore, the spacetime might admit a geodesic extension. Weyl anomaly correcti...

Gravity field recovery from satellite altimetry provides global marine coverage but lacks the accuracy and resolution needed for many exploration geophysics studies. The repeating ground tracks of the ERS-1/2, Geosat, and Topex/Poseidon altimeters offer the possibility of improving the accuracy and resolution of gravity anomalies along widely spaced (∼40-km spacing) tracks. However, complete oc...

The 3D correlation imaging for gravity and gravity gradiometry data provides a rapid approach to the equivalent estimation of objective bodies with different density contrasts in the subsurface. The subsurface is divided into a 3D regular grid, and then a cross correlation between the observed data and the theoretical gravity anomaly due to a point mass source is calculated at each grid node. T...

In a classical conformal invariant supersymmetric gauge theory, the chiral R-symmetry current jμ, the supersymmetry current sμ and the energymomentum tensor θμν constitute a supercurrent multiplet. There are two different superconformal anoamly multiplets in four-dimensional supersymmetric gauge theories, one originating from the supersymmetric gauge dynamics and the consequent nonvanishing β-f...

Gravitational axial and chiral anomalies in a noncommutative space are examined through the explicit perturbative computation of one-loop diagrams in various dimensions. The analysis depend on how gravity is coupled to noncommutative matter fields. DelbourgoSalam computation of the gravitational axial anomaly contribution to the pion decay into two photons, is studied in detail in this context....

Gravity geologic method is one of the important to derive seafloor topography by using altimetry-gravity, and its committed step gridding regional gravity anomaly. Hence, we proposed a constraint factor weight optimization (TCFWO) based on ordinary kriging method. This fully considers influence factors construction grid besides horizontal distance. The results anomaly models constructed in Mark...

this paper attempts to investigate the capability of the numerical finite element method for the removal of the regional effects from the observed gravity data from the dehnow anticline. from a geological point of view, the dehnow area is a part of the fars sedimentary basin south-east iran. the khamy formation and bangestan group are the oldest geological structures in the area that have outcr...