Results 1 to 10 of about 50 (50)
Nuclear Physics B, 2004 This paper deals with the thermodynamic properties of a phantom field in a flat Friedmann-Robertson-Walker universe. General expressions for the temperature and entropy of a general dark-energy field with equation of state $p= $ are derived from which we have deduced that, whereas the temperature of a cosmic phantom fluid ($
González-Díaz, Pedro F. +1 more
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Intensive Care Medicine, 2020 ispartof: location:United ...
Dieter Frans Dauwe +3 more
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Phantom depth and stable phantom exactness [PDF]
Transactions of the American Mathematical Society, 2007 Phantom depth, phantom nonzerodivisors, and phantom exact sequences are analogues of the non-“phantom” notions which have been useful in tackling the (very difficult) localization problem in tight closure theory. In the present paper, these notions are developed further and partially reworked. For instance, although no analogue of a long exact sequence
Neil Epstein, Neil Epstein
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Modern Physics Letters A, 2006 The Observed Perlmutter-Riess Acceleration (OPRA) implies that the expansion of the Universe is currently increasing and is motivation for the so-called phantom energy models. We consider the dynamics of phantom scalar field models. An important physical time constraint, which can be used to rule out many cosmological models, is obtained from the ...
J. Latta, Alan Coley, Sigbjørn Hervik
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Vision Research, 2015 It is well known that visible luminance gradients may generate contrast effects. In this work we present a new paradoxical illusion in which the luminance range of gradual transitions has been reduced to make them invisible. By adopting the phenomenological method proposed by Kanizsa, we have found that unnoticeable luminance gradients still generate ...
GALMONTE, ALESSANDRA +3 more
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On phantom thermodynamics [PDF]
Physics Letters B, 2008 The thermodynamic properties of dark energy fluids described by an equation of state parameter $ =p/ $ are rediscussed in the context of FRW type geometries. Contrarily to previous claims, it is argued here that the phantom regime $ 0$ and $S>0$ in the course of the Universe expansion.
J. A. S. Lima, S. H. Pereira
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Phantom maps and chromatic phantom maps [PDF]
American Journal of Mathematics, 2000 In the first part, we determine conditions on spectra X and Y under which either every map from X to Y is phantom, or no nonzero maps are. We also address the question of whether such all or nothing behavior is preserved when X is replaced with V Λ X for V finite. In the second part, we introduce chromatic phantom maps.
Mark Hovey, J. Daniel Christensen
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Crossing the phantom divide without phantom matter [PDF]
Journal of Cosmology and Astroparticle Physics, 2006 A class of braneworld models can lead to phantom-like acceleration of the late universe, but without the need for any phantom matter. In the simplest models, the universe contains only cold dark matter and a cosmological constant. We generalize these models by introducing a quintessence field. The new feature in our models is that quintessence leads to
Chimento, L. +3 more
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Phantom hCG and Phantom Choriocarcinoma
Gynecologic Oncology, 1998 Phantom hCG and phantom choriocarcinoma syndrome (pseudohypergonadotropinemia) refers to persistent mild elevations of hCG, leading physicians to treat patients with cytotoxic chemotherapy for choriocarcinoma when in reality no true hCG or trophoblast disease is present. We report here three cases of the phantom hCG and phantom choriocarcinoma syndrome
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Nature, 1878 IT might be supposed that permanent and entirely local or “internal” force-pairs of this kind acting on innumerable material couplets in a system would so disturb the individual energies of their motions that no general conclusion as to the total change of energy during the progress of such a system's motion could be drawn; but the simple law that ...
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