A5018868982- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Noncommutative and Quantum Gravity Theories
- Nonlinear Waves and Solitons
- Particle physics theoretical and experimental studies
- Advanced Differential Geometry Research
- Physics of Superconductivity and Magnetism
- Advanced Mathematical Physics Problems
- Pulsars and Gravitational Waves Research
- Quantum and electron transport phenomena
- Quantum Electrodynamics and Casimir Effect
- Inorganic Fluorides and Related Compounds
- Geometry and complex manifolds
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Astrophysical Phenomena and Observations
- Advanced Topics in Algebra
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Chromodynamics and Particle Interactions
- Quantum Information and Cryptography
- Algebraic structures and combinatorial models
- Innovative Teaching Methods
- Online and Blended Learning
- Scientific Research and Discoveries
- Superconducting Materials and Applications
Chalmers University of Technology
2013-2023
King's College London
2004-2009
University of Cambridge
2009
Universitat de Barcelona
2009
KU Leuven
2006-2007
University of Groningen
2002-2003
We propose a new method to solve the Killing spinor equations of 11-dimensional supergravity based on description spinors in terms forms and Spin(1, 10) gauge symmetry supercovariant derivative. give canonical form for backgrounds preserving two supersymmetries, N = 2, provided that one represents orbit with stability subgroup SU(5). directly 1 some 3 4 backgrounds. In 2 case, we investigate SU(5) SU(4) invariant compute associated spacetime forms. find admit timelike vector space transverse...
The normal state of optimally doped cuprates is dominated by the "strange metal" phase that shows a linear temperature ($T$) dependence resistivity persisting down to lowest $T$. For underdoped this behavior lost below pseudogap $T^*$, where Charge Density Waves (CDW) together with other intertwined local orders characterize ground state. Here we show $T$-linear highly strained, ultrathin and YBa$_2$Cu$_3$O$_{7-\delta}$ films restored when CDW amplitude, detected Resonant Inelastic X-ray...
We have developed a Mathematica package capable of performing gamma-matrix algebra in arbitrary (integer) dimensions. As an application we can compute Fierz transformations.
We solve the Killing spinor equations of supersymmetric IIB backgrounds which admit one supersymmetry and has stability subgroup G_2 in Spin(9,1) x U(1). find that such a time-like vector field geometric structure spacetime reduces from U(1) to G_2. determine type admits by computing covariant derivatives forms associated with bilinears. also two supersymmetries Spin(7)\ltimes R^8-invariant spinors, four SU(4)\ltimes R^8- G_2-invariant spinors. show factorize sets, involving geometry...
We investigate the Killing spinor equations of IIB supergravity for one spinor. show that there are three types orbits Spin(9,1) in space Weyl spinors which give rise to with stability subgroups $Spin(7)\ltimes \bR^8$, $SU(4)\ltimes \bR^8$ and $G_2$. solve invariant spinors, fluxes terms geometry determine conditions on spacetime imposed by supersymmetry. In both cases, admits a null, self-parallel, vector field. also apply our formalism examine class backgrounds admit two pure as spacetimes.
A precise characterization of the recently discovered crossover to hydrodynamic transport in electron liquids, and particular a conjectured exotic odd-parity regime, requires full solution Fermi-liquid collision integral at all temperatures beyond state-of-the-art analytic leading-logarithmic approximations. We develop general basis expansion linearized applicable temperatures, employ this determine decay rates Fermi surface perturbations two-dimensional liquids. In particular, we provide...
A bstract We study the dynamics and relaxation of bulk plasmons in strongly coupled quantum critical systems using holographic framework. analyze dispersion relation plasmonic modes detail for an illustrative class bottom-up models. Comparing to a simple hydrodynamic formula, we entangle complicated interplay between three least damped shed light on underlying physical processes. Such as dependence plasma frequency effective time terms electromagnetic coupling, charge temperature system....
We reduce the classification of all supersymmetric backgrounds in eleven dimensions to evaluation supercovariant derivative and an integrability condition, which contains field equations, on six types spinors. determine expression spinors give each case equations that do not arise as conditions Killing spinor equations. The a background become linear system for fluxes, geometry spacetime derivatives functions solution expresses fluxes terms specifies restrictions backgrounds. also show...
We reduce the classification of all supersymmetric backgrounds IIB supergravity to evaluation Killing spinor equations and their integrability conditions, which contain field equations, on five types spinors. This extends work Gran et al (2005 Class. Quantum Grav. 22 118 (Preprint hep-th/0503046)) supergravity. give expressions In this way, become a linear system for fluxes, geometry spacetime derivatives functions that determine can be solved express fluxes in terms conditions any...
We investigate half-supersymmetric domain wall solutions of four maximally supersymmetric D = 9 massive supergravity theories obtained by Scherk–Schwarz reduction 10 IIA and IIB supergravity. One the does not have a superpotential allow preserving any supersymmetry. The other three superpotentials leading to solutions, one which has zero potential but non-zero superpotential. uplifting these ten dimensions leads classes type 7-brane solutions. All within each class are related SL(2, )...
We perform the generalized dimensional reduction of D = 11 supergravity over three-dimensional group manifolds as classified by Bianchi. Thus, we construct different maximal 8 gauged supergravities, two which have an additional parameter. One class (class B) leads to supergravities that are defined a set equations motion cannot be integrated action. All 1/2 BPS domain wall solutions given. also find non-supersymmetric solution where single transverse direction is time. This describes...
We investigate the accelerating phases of cosmologies supported by a metric, scalars and single exponential scalar potential. The different solutions can be represented trajectories on sphere we find that quintessence happens within "arctic circle" sphere. Furthermore, obtain multi-exponential potentials from 3D group manifold reductions gravity, implying such embedded in gauged supergravities with an M-theory origin. relate double case to flux compactifications maximally symmetric spaces...
We present all the symmetry superalgebras $\mathfrak{g}$ of warped AdS$_k\times_w M^{d-k}$, $k>2$, flux backgrounds in $d=10, 11$ dimensions preserving any number supersymmetries. First we give conditions for to decompose into a direct sum isometry algebra AdS$_k$ and that internal space $M^{d-k}$. Assuming this decomposition, identify AdS$_3$ by showing groups spaces act transitively on spheres. demonstrate type II $d=11$ theories may not be simple also heterotic backgrounds. Furthermore,...