57,513 research outputs found
The horizon of the lightest black hole
Full text linkWe study the properties of the poles of the resummed graviton propagator obtained by resumming bub- ble matter diagrams which correct the classical graviton prop- agator. These poles have been previously interpreted as black holes precursors. Here, we show using the horizon wave- function formalism that these poles indeed have properties which make them compatible with being black hole precur- sors. In particular, when modeled with a Breit–Wigner dis- tribution, they have a well-defined gravitational radius. The probability that the resonance is inside its own gravitational radius, and thus that it is a black hole, is about one half. Our results confirm the interpretation of these poles as black hole precursors
Deformed special relativity from asymptotically safe gravity
No full textBy studying the notion of a fundamentally minimal length scale in asymptotically safe gravity we find that a specific version of deformed special relativity (DSR) naturally arises in this approach. We then consider two thought experiments to examine the interpretation of the scenario and discuss similarities and differences to other approaches to DSR
Traces and shards of self-injury: Strange accounting with “Author X”
No full textIn this strange account autoethnography, three or four authors explore their lived experiences with self-injury. Strange accounting is both a post-modern style of text, and a method for keeping identities concealed when risks and secrets are in play. Author X, a post-modern place-keeper for an anonymous author who may or may not have contributed to this manuscript, introduces a new dimension and layer of concealment. With Author X in-play and under erasure, the reader will never be sure if there were three or four authors on this manuscript. Through strange accounting, a post-structuralist/postmodernist frame will be applied to understanding the self-injury experience. We frame self-injury as a social practice and, for some, an everyday norm, while remaining acutely aware of the stigma surrounding the topic of self-injury. Each of us, coupled with Author X, provide the others cover to trace stories of self-injury through the literature, our flesh, and our lives
Charged black hole remnants at the LHC
No full textWe investigate possible signatures of long-lived (or stable) charged black holes at the Large Hadron Collider. In particular, we find that black hole remnants are charac- terised by quite low speed. Due to this fact, the charged remnants could, in some cases, be very clearly distinguished from the background events, exploiting d E /d X measure- ments. We also compare the estimate energy released by such remnants with that of typical Standard Model particles, using the Bethe–Bloch formula
Quantum black holes and their lepton signatures at the LHC with CalCHEP
No full textWe discuss a field theoretical framework to describe the interactions of non-thermal quantum black holes (QBHs) with particles of the Standard Model. We propose a non-local Lagrangian to describe the production of these QBHs which is designed to reproduce the geometrical cross section prs2 for black hole production where rs is the Schwarzschild radius. This model is implemented into CalcHEP package and is publicly available at the High Energy Model Database (HEPMDB) for simulation of QBH events at the LHC and future colliders. We present the first phenomenological application of the QBH@HEPMDB model with spin-0 neutral QBH giving rise the e+e- and eµ signatures at the LHC@8TeV and LHC@13TeV and produce the respective projections for the LHC in terms of limits on the reduced Planck mass, M¯PL and the number of the extra-dimensions n
Study on the influence of topography on wind shear numerical simulations based on WRF–CALMET
Full text link<jats:p>Abstract. This study focuses on the critical issue of low-altitude wind shear, which is vital for aircraft safety during takeoff and landing. Using the WRF–CALMET model, we assess the impact of topography on low-level wind shear at Zhongchuan Airport. CALMET outperforms WRF, showing improved simulation accuracy. CALMET's simulation highlights diurnal variations in vertical wind shear, which are especially pronounced from 13:00 to 24:00 CST (China standard time, UTC+8). Notably, CALMET indicates wind shear that is one to two hazard levels higher for aircraft operations compared to WRF over a significant area. Terrain sensitivity experiments reveal CALMET's responsiveness to terrain changes during high-wind-shear periods, with reduced impact at higher altitudes. CALMET's incorporation of kinematic terrain influences, blocking effects, slope flow, and strengthened diversion of near-surface airflow on complex terrain contribute to these findings. This study confirms the efficacy of CALMET in simulating low-altitude wind shear, emphasizing its superiority in capturing terrain influences and reducing the aviation safety threat posed by low-altitude wind shear.
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Graviton propagator, renormalization scale and black-hole like states
No full textWe study the analytic structure of the resummed graviton propagator, inspired by the possible existence of black hole precursors in its spectrum. We find an infinite number of poles with positive mass, but both positive and negative effective width, and studied their asymptotic behaviour in the infinite sheet Riemann surface. We find that the stability of these precursors depend crucially on the value of the normalisation point scale
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Von denen so genannten Vampiren Oder zurückkommenden Verstorbenen in Ungarn, Mahren etc. Aus der zweyten bereinigten und vermehrten Französischen Auflage übersetzt Von einem Priester Ord. S. Bened.
Full text linkVON DENEN SO GENANNTEN VAMPIREN ODER ZURÜCKKOMMENDEN VERSTORBENEN IN UNGARN, MAHREN ETC. AUS DER ZWEYTEN BEREINIGTEN UND VERMEHRTEN FRANZÖSISCHEN AUFLAGE ÜBERSETZT VON EINEM PRIESTER ORD. S. BENED.
[Gelehrte Verhandlung der Materi, Von Erscheinungen der Geisteren, Und denen Vampiren in Ungarn, Mahren etc.] Des Hochwürdigen Herrn Augustini Calmet ... Gelehrte Verhandlung der Materi, Von Erscheinungen der Geisteren, Und denen Vampiren in Ungarn, Mahren etc. : Aus deren Anlaß auch darin von Zaubereyen und Hexereyen, von Besessenen und Bezauberten, von denen alten heydnischen Oraculis, oder Götzen-Bescheiden, vom Wahrsagen und Offenbaren verborgener oder künfftigen Dingen, von Wirckungen und Blendungen des Satans, von Erscheinungen so wohl Verstorbener, als auch noch Lebender, die andern weit entfernten Menschen geschehen seynd etc. gehandlet wird / Calmet, Augustin. - Augsburg : Rieger, 1751 (-)
Von denen so genannten Vampiren Oder zurückkommenden Verstorbenen in Ungarn, Mahren etc. Aus der zweyten bereinigten und vermehrten Französischen Auflage übersetzt Von einem Priester Ord. S. Bened. (Th. 2) (2)
Vorrede (2)
Register (10)
I. - X. Capitul (16)
XI. - XX. Capitul (54)
XXI. - XXX. Capitul (92)
XXXI. - XL. Capitul (121)
XLI. - L. Capitul (191)
LI. - LIX. Capitul (223
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