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We compute the supersymmetric contribution to the anomalous magnetic moment of the muon within the context of SU(5) XU( 1) supergravity models. The largest possible contributions to a ySY occur for the largest allowed values of tanP and can easily exceed the present experimentally allowed range, even after the CERN LEP lower bounds on the sparticle masses are imposed. Such tanP enhancement implies that a y S Y can greatly exceed both the electroweak contribution ( = 1.95 X and the present hadronic uncertainty ( z i 1 . 7 5 X lop9). Therefore, the new E821 Brookhaven experiment (with an expected accuracy of O.4Xshould explore a large fraction (if not all) of the parameter space of these models, corresponding to slepton, chargino, and squarks masses as high as 200, 300, and 1000 GeV, respectively. Moreover, contrary to popular belief, the a y Y contribution can have either sign, depending on the sign of the Higgs mixing parameter p: a ySY > 0 ( < 0) for p > 0 (p < 0). The present a , constraint excludes chargino masses in the range 45-120 GeV depending on the value of tan& although there are no constraints for tan05 8. We also compute aSUSY and find !asUSY I -( m 7 / m , I 2 a y S Y ! < and briefly comment on its possible observability.

We present a systematic phenomenological analysis of the tests of CPT symmetry that are possible within an open quantum-mechanical description of the neutral kaon system that is motivated by arguments based on quantum gravity and string theory. We develop a perturbative expansion in terms of the three small CPT-violating parameters admitted in this description, and provide expressions for a complete set of K→2, 3, and l decay observables to second order in these small parameters, and contrast this formalism with CPT violation within conventional quantum mechanics. We also illustrate the new tests of CPT symmetry and quantum mechanics that are possible in the open quantum-mechanical formalism using a regenerator. Indications are that experimental data from the CPLEAR and previous experiments could be used to establish upper bounds on the CPT-violating parameters that are of order 10 Ϫ19 GeV, approaching the order of magnitude that may be attainable in quantum theories of gravity.

We present an extensive search for a general class of flipped SU (5) models built within the free fermionic formulation of the heterotic string. We describe a set of algorithms which constitute the basis for a computer program capable of generating systematically the massless spectrum and the superpotential of all possible models within the class we consider.Our search through the huge parameter space to be explored is simplified considerably by the constraint of N = 1 spacetime supersymmetry and the need for extra Q,Q representations beyond the standard ones in order to possibly achieve string gauge coupling unification at scales of O(10 18 GeV). Our results are remarkably simple and evidence the large degree of redundancy in this kind of constructions. We find one model with gauge5 and fairly acceptable phenomenological properties. We study the D-and F -flatness constraints and the symmetry breaking pattern in this model and conclude that string gauge coupling unification is quite possible.

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Distributed Acoustic Sensing is a novel technology for seismic data acquisition, particularly suitable for Vertical Seismic Profiling. It is a break‐through for low‐cost, on‐demand, seismic monitoring of reservoirs, both onshore and offshore. In this article we explain how Distributed Acoustic Sensing works and demonstrate its usability for typical Vertical Seismic Profiling applications such as checkshots, imaging, and time‐lapse monitoring. We show numerous data examples, and discuss Distributed Acoustic Sensing as an enabler of seismic monitoring with 3D Vertical Seismic Profiling.

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We compute the number of trilepton events to be expected at Fermilab as a result of the reaction P p -~f~;~, where x f is the lightest chargino and X: is the next-to-lightest neutralino. This signal is expected to have very little background and is the best prospect for supersymmetry detection at Fermilab if the gluino and squarks are beyond reach. We evaluate our expressions for all points in the allowed parameter space of two basic supergravity models: (i) the minimal SU(5) supergravity model including the severe constraints from proton decay and a not too young universe and (ii) a recently proposed no-scale flipped SU(5) supergravity model. We study the plausible experimental scenarios and conclude that a large portion of the parameter spaces of these models could be explored with 100 pb-' of integrated luminosity. In the minimal SU(5) supergravity model chargino masses as high as 100 GeV could be probed. In the no-scale flipped model it should be possible to probe some regions of parameter space with m + 5 175 GeV, therefore, possibly exceeding the reach of the CERN LEP I1 for chargino and Xineutralino (since m ,=m + ) masses. In both models such probes would indirectly explore gluinox,