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  • Classical Collapse to Black Holes and Quantum Bounces: A Review 
    Malafarina, Daniele (Universe, 2017-05-26)
    In the last four decades, different programs have been carried out aiming at understanding the final fate of gravitational collapse of massive bodies once some prescriptions for the behaviour of gravity in the strong field ...
  • Black supernovae and black holes in non-local gravity 
    Bambi, Cosimo; Malafarina, Daniele; Modesto, Leonardo (ArXiv, 2016-04-22)
    In a previous paper, we studied the interior solution of a collapsing body in a non-local theory of gravity super-renormalizable at the quantum level. We found that the classical singularity is replaced by a bounce, after ...
  • Essentials of Endorheic Basins and Lakes: A Review in the Context of Current and FutureWater Resource Management and Mitigation Activities in Central Asia 
    Yapiyev, Vadim; Sagintayev, Zhanay; Inglezakis, Vassilis J.; Samarkhanov, Kanat; Verhoef, Anne (Water, 2017-10-21)
    Endorheic basins (i.e., land-locked drainage networks) and their lakes can be highly sensitive to variations in climate and adverse anthropogenic activities, such as overexploitation of water resources. In this review ...
  • Observational properties of rigidly rotating dust configurations 
    Ilyas, Batyr; Yang, Jinye; Malafarina, Daniele; Bambi, Cosimo (European Physical Journal C: Particles and Fields, 2017-07-11)
    We study the observational properties of a class of exact solutions of Einstein’s field equations describing stationary, axially symmetric, rigidly rotating dust (i.e. noninteracting particles).We ask the questionwhether ...
  • On horizonless temperature with an accelerating mirror 
    Good, Michael R.R.; Yelshibekova, Khalykbek; Chin Ong, Yen (ArXiv, 2017-03-03)
    A new solution of a unitary moving mirror is found to produce nite energy and emit thermal radiation despite the absence of an acceleration horizon. In the limit that the mirror approaches the speed of light, the model ...
  • Inherent photoluminescence Stokes shift in GaAs 
    Ullrich, Bruno; Singh, Akhilesh K.; Barik, Puspendu; Xi, Haowen; Bhowmick, Mithun (Optics letters, 2015-06-01)
    The intrinsic photoluminescence Stokes shift, i.e., the energy difference between optical band gap and emission peak, of 350 μm thick semi-insulating GaAs wafers is found to be 4 meV at room temperature. The result is based ...
  • Manipulating polarized light with a planar slab of black phosphorus 
    Valagiannopoulos, Constantinos; Mattheakis, Marios; Shirodkar, Sharmila N; Kaxiras, Efthimios (Journal of Physics Communications, 2017-11-08)
    Wave polarization contains valuable information for electromagnetic signal processing; thus, the ability to manipulate it, can be extremely useful in modeling photonic devices. In this work, we propose designs comprised ...
  • Photoluminescence lineshape of ZnO 
    Ullrich, Bruno; Singh, Akhilesh K.; Bhowmick, Mithun; Barik, Puspendu; Ariza-Flores, David; Xi, Haowen; Tomm, Jens W. (American Institute of Physics, 2014)
    The merger of the absorption coefficient dispersion, retrieved from transmission by the modified Urbach rule introduced by Ullrich and Bouchenaki [Jpn. J. Appl. Phys. 30, L1285, 1991], with the extended Roosbroeck-Shockley ...
  • Functional Metaplasticity of Hippocampal Schaffer Collateral-CA1 Synapses Is Reversed in Chronically Epileptic Rats 
    Rehberg, Mirko; Kirschstein, Timo; Guli, Xiati; Müller, Steffen; Rohde, Marco; Franz, Denise; Tokay, Tursonjan; Köhling, Rüdiger (Neural Plasticity, 2017-10-02)
    Spatial learning and associating spatial information with individual experience are crucial for rodents and higher mammals. Hence, studying the cellular and molecular cascades involved in the key mechanism of information ...
  • Examination of nanosecond laser melting thresholds in refractory metals by shear wave acoustics 
    Abdullaev, A.; Muminov, B.; Rakhymzhanov, A.; Mynbayev, N.; Utegulov, Z. N. (American Institute of Physics, 2017-07-12)
    Nanosecond laser pulse-induced melting thresholds in refractory (Nb, Mo, Ta and W) metals are measured using detected laser-generated acoustic shear waves. Obtained melting threshold values were found to be scaled with ...
  • Waves in hyperbolic and double negative metamaterials including rogues and solitons 
    Boardman, A D; Alberucci, A; Assanto, G; Grimalsky, V V; Kibler, B; McNiff, J; Nefedov, I S; Rapoport, Yu G; Valagiannopoulos, Constantinos (Nanotechnology, 2017-10-20)
    The topics here deal with some current progress in electromagnetic wave propagation in a family of substances known as metamaterials. To begin with, it is discussed how a pulse can develop a leading edge that steepens and ...
  • Mitigating Snell’s-Law Reflection and Transmission with Metasurfaces of Ordinary Dielectrics 
    Tsitsas, N. L.; Valagiannopoulos, Constantinos (IEEE, 2017)
    Obtaining anomalous reflection and transmission (namely propagation along directions different from those predicted by Snell’s law) is investigated for plane waves impinging on a planar periodic metasurface composed of two ...
  • Judicious distribution of laser emitters to shape the desired far-field patterns 
    Valagiannopoulos, Constantinos; Kovanis, Vassilios (PHYSICAL REVIEW A, 2017-06-06)
    In this paper, motivated by such trends in coupled optical oscillators and applied mathematics methods, we inject an inverse-design approach in the construction of the far field of multiple radiating optical apertures. ...
  • Horizon-T Experiment Calibrations – MIP Signal from Scintillator and Glass Detectors 
    Beznosko, Dmitriy; Beremkulov, T.; Iakovlev, A.; Duspayev, A.; Vildanova, M. I.; Uakhitov, T.; Yelshibekov, K.; Yessenov, M.; Zhukov, V.V. (arXiv.org, 2017)
    Horizon-T, a modern Extensive Air Showers (EAS) detector system, is constructed at Tien Shan high-altitude Science Station of Lebedev Physical Institute of the Russian Academy of Sciences at approximately 3340 meters above ...
  • Glass-based charged particle detector performance for Horizon-T EAS detector system 
    Yessenov, M.; Duspayev, A.; Beznosko, Dmitriy; Iakovlev, A.; Vildanova, M.I.; Zhukov, V.V. (arXiv.org, 2017)
    An implementation of a novel of glass-based detector with fast response and wide detection range is needed to increase resolution for ultra-high energy cosmic rays detection. Such detector has been designed and built for ...
  • Anomalous reflection of visible light by all-dielectric gradient metasurfaces 
    Tsitsas, Nikolaos L.; Valagiannopoulos, Constantinos (Journal of the Optical Society of America B, 2017-03-15)
    Plane wave scattering by a planar metasurface composed of two periodically alternating rectangular dielectric rods is considered. A rigorous integral equation methodology is employed for the analysis and the accurate ...
  • Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces 
    Savoia, Silvio; Valagiannopoulos, Constantinos; Monticone, Francesco; Castaldi, Giuseppe; Galdi, Vincenzo; Al`u, Andrea (PHYSICAL REVIEW B. American Physical Society, 2017)
    We show that a cylindrical lensing system composed of two metasurfaces with suitably tailored non-Hermitian (i.e., with distributed gain and loss) and nonlocal (i.e., spatially dispersive) properties can perform ...
  • Lowest 2S Electronic Excitations of the Boron Atom 
    Bubin, Sergiy; Adamowicz, Ludwik (PHYSICAL REVIEW LETTERS, 2017-01)
    A theoretical ab initio approach for calculating bound states of small atoms is developed and implemented. The approach is based on finite-nuclear-mass [non-Born-Oppenheimer (non-BO)] nonrelativistic variational calculations ...
  • Breaking the black-body limit with resonant surfaces 
    Valagiannopoulos, Constantinos; Simovski, Constantin R.; Tretyakov, Sergei A. (EPJ Applied Metamaterials, 2017)
    The speed with which electromagnetic energy can be wirelessly transferred from a source to the user is a crucial indicator for the performance of a large number of electronic and photonic devices. We expect that ...
  • Giant enhancement of the controllable in-plane anisotropy of biased isotropic noncentrosymmetric materials with epsilon-negative multilayers 
    Valagiannopoulos, Constantinos; Tsitsas, N. L.; Lakhtakia, A. (Journal of Applied Physics, 2017)
    Giant in-plane anisotropy can be exhibited by a finitely thick periodic multilayer comprising bilayers of an isotropic noncentrosymmetric material and a non-dissipative isotropic medium of negative permittivity, when a ...