Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Bose-Einstein condensation (BEC) has been observed in a dilute gas of sodium atoms. A Bose-Einstein condensate consists of a macroscopic population of the ground state of the system, and is a coherent state of matter. In an ideal gas, this phase transition is purely quantum-statistical. The study of BEC in weakly interacting systems which can be controlled and observed with precision holds the promise of revealing new macroscopic quantum phenomena that can be understood from first principles.

Bose-Einstein condensation in a gas of sodium atoms

Gravitational Field of a Spinning Mass as an Example of Algebraically Special Metrics

Metric affine gauge theory of gravity: Field equations, Noether identities, world spinors, and breaking of dilation invariance

This article discusses fluctuating order in a quantum disordered phase proximate to a quantum critical point, with particular emphasis on fluctuating stripe order. Optimal strategies are derived for extracting information concerning such local order from experiments, with emphasis on neutron scattering and scanning tunneling microscopy. These ideas are tested by application to two model systems---an exactly solvable one-dimensional (1D) electron gas with an impurity, and a weakly interacting 2D electron gas. Experiments on the cuprate high-temperature superconductors which can be analyzed using these strategies are extensively reviewed. The authors adduce evidence that stripe correlations are widespread in the cuprates. They compare and contrast the advantages of two limiting perspectives on the high-temperature superconductor: weak coupling, in which correlation effects are treated as a perturbation on an underlying metallic (although renormalized) Fermi-liquid state, and strong coupling, in which the magnetism is associated with well-defined localized spins, and stripes are viewed as a form of micro phase separation. The authors present quantitative indicators that the latter view better accounts for the observed stripe phenomena in the cuprates.

How to detect fluctuating stripes in the high-temperature superconductors

Recently, the study of three-dimensional spaces is becoming of great interest. In these dimensions the Cotton tensor is prominent as the substitute for the Weyl tensor. It is conformally invariant and its vanishing is equivalent to conformal flatness. However, the Cotton tensor arises in the context of the Bianchi identities and is present in any dimension n. We present a systematic derivation of the Cotton tensor. We perform its irreducible decomposition and determine its number of independent components as n(n2 − 4)/3 for the first time. Subsequently, we show its characteristic properties and perform a classification of the Cotton tensor in three dimensions. We investigate some solutions of Einstein's field equations in three dimensions and of the topologically massive gravity model of Deser, Jackiw and Templeton. For each class examples are given. Finally, we investigate the relation between the Cotton tensor and the energy–momentum in Einstein's theory and derive a conformally flat perfect fluid solution of Einstein's field equations in three dimensions.

https://iopscience.iop.org/article/10.1088/0264-9381/21/4/024/pdf

The Cotton tensor in Riemannian spacetimes

In continuing our series on metric–affine gravity (see Gronwald, Int. J. Mod. Phys.D6, 263 (1997) for Part I), we review the exact solutions of this theory.

Metric-Affine Gauge Theory of Gravity II:. Exact Solutions

In (1+2)-dimensional Poincare gauge gravity, we start from a Lagrangian depending on torsion and curvature which includes additionally {\em translational} and {\em Lorentzian} Chern-Simons terms. Limiting ourselves to to a specific subcase, the Mielke-Baekler (MB) model, we derive the corresponding field equations (of Einstein-Cartan-Chern-Simons type) and find the general vacuum solution. We determine the properties of this solution, in particular its mass and its angular momentum. For vanishing torsion, we recover the BTZ-solution. We also derive the general conformally flat vacuum solution with torsion. In this framework, we discuss {\em Cartan's} (3-dimensional) {\em spiral staircase} and find that it is not only a special case of our new vacuum solution, but can alternatively be understood as a solution of the 3-dimensional Einstein-Cartan theory with matter of constant pressure and constant torque.

Exact vacuum solution of a (1+2)-dimensional Poincare gauge theory: BTZ solution with torsion

We give an overview of ongoing searches for effects motivated by the study of the quantum‐gravity problem. We describe in greater detail approaches which have not been covered in recent “Quantum Gravity Phenomenology” reviews. In particular, we outline a new framework for describing Lorentz invariance violation in the Maxwell sector. We also discuss the general strategy on the experimental side as well as on the theoretical side for a search for quantum gravity effects. The role of test theories, kinematical and dymamical, in this general context is emphasized. The present status of controlled laboratory experiments is described, and we also summarize some key results obtained on the basis of astrophysical observations.

The Search for Quantum Gravity Signals

Preface. Contributing Authors. Part I: Quantum Gravity and String Theories. On the Berezin Description of Kahler Quotients I. Carrillo-Ibarra, H. Garcia-Compean. (2+1)-dimensional Supergravity A. Macias. Non-Commutative Gravity and Quantum Cosmology H. Garcia-Compean, et al. Consistent Discretizations in Classical and Quantum General Relativity R. Gambini, J. Pullin. The field-to-particle Transition Problem J. Cortez, et al. Towards Non-Commutative Topological Gauge Theory of Gravity H. Garcia-Compean, et al. Part II: Cosmology and Black Holes. Improving the "No-Hair" Theorem for the Proca Field E. Ayon-Beato. New Model Calculations of Protostellar Collapse and Fragmentation J. Klapp, L. Di G. Sigalotti. Inflationary Cosmology and the Braneworld Scenario J.E. Lidsey. Galaxies Formation from the Scalar Field Dark Matter model T. Matos. Scalar soliton modelling dark matter halos E.W. Mielke, et al. The de Sitter/Anti- de Sitter Black Holes phase transition? S. Nojiri, S.D. Odintsov. Understanding hairy Black Holes with the Isolated Horizon Formalism D. Sudarsky. Sketching the inflaton potential C.A. Terrero-Escalante. Part III: Exact Solutions. Cosmological solutions and their stability in scalar-tensor theories J.L. Cervantes-Cota, et al. Accelerated Expansion Considerations in a Scalar-Tensor Cosmology P. Chauvet-Alducin. On Conformally Flat Stationary Axisymmetric Spacetimes C. Campuzano, A. Garcia. Quantum Cosmology in some extended Scalar-Tensor Theories S. del Campo, et al. Deformation Quantization of sdiff(Sigma2) SDYM Equation M. Przanowski, et al. Part IV: Experiments and Other Topics. Nonlocality and Superluminal Signal-Velocity in Photonic Tunneling G. Nimtz, A. Haibel. At the Interface of Quantum and Gravitational Realms D.V. Ahluwalia. Non-Newtonian gravity and coherence properties of light A. Camacho. On a possible new type of a T odd skewon field linked to electromagnetism F.W. Hehl, et al. A Proposal for Testing the Weak Equivalence Principle for Charged Particles in Space H. Dittus, C. Laemmerzahl. Massive (1/2,1/2) Bosons D.V. Ahluwalia, M. Kirchbach. Inhomogeneous cosmologies with adiabatic evolution R.A. Sussman, M. Ishak. Index.

Alfredo Macías

Papers

The Cotton tensor in Riemannian spacetimes

Metric-Affine Gauge Theory of Gravity II:. Exact Solutions

Exact vacuum solution of a (1+2)-dimensional Poincare gauge theory: BTZ solution with torsion

The Search for Quantum Gravity Signals

Cosmology and gravitation