Results 51 to 60 of about 193,127 (291)

METAPHYSICS AND EPISTEMOLOGY IN STEPHEN HAWKING'S THEORY OF THE CREATION OF THE UNIVERSE

Zygon, 1996
. In 1981 S. W. Hawking and J. Hartle presented a quantum mechanical description of the early stages of possible cosmological evolution. Their proposal was interpreted by many authors as a pattern of cosmic creation from nothing in which no divine ...
doaj   +2 more sources

w=−1 as an Attractor

The Open Journal of Astrophysics, 2016
It has recently been shown, in flat Robertson-Walker geometries, that the dynamics of gravitational actions which are minimally coupled to matter fields leads to the appearance of “attractors” - sets of physical observables on which phase space measures ...
David Sloan
doaj   +1 more source

Cosmological Solutions in Nonlocal Models

, 2014
A non-local modified gravity model with an analytic function of the d'Alembert operator that has been proposed as a possible way of resolving the singularities problems in cosmology is considered.
Koshelev, Alexey S., Vernov, Sergey Yu.
core   +1 more source

The Layout and Size of an Early Pre‐Pottery Neolithic B Small Settlement Revealed by Geophysical Prospection at Harbetsuvan Tepesi in Southeastern Anatolia

Archaeological Prospection, EarlyView.
ABSTRACT In Upper Mesopotamia, the transition from the Pre‐Pottery Neolithic A (PPNA) to Pre‐Pottery Neolithic B (PPNB) period, ca. 10 800–10 600 cal. BP, is marked by a series of changes in chipped stone industries, architectural forms, symbolic objects, regional distribution of settlements and long‐distance exchange networks among others.
Toshihiro Tada, Ryota Moriwaki, Kazuya Shimogama, Kenta Suzuki, Wataru Satake, Nurcan Küçükarslan, Celal Uludağ, Yoshihiro Nishiaki   +7 more
wiley   +1 more source

Streamlined supergravity

Journal of High Energy Physics
The textbook N=1 supergravity has an F-term potential depending on a superpotential W (z i ) and a Kähler potential K z i z ¯ i ¯ $$ K\left({z}^i,{\overline{z}}^{\overline{i}}\right) $$ , with the scalar potential V z i z ¯ i ¯ $$ V\left({z}^i,{\overline{
Renata Kallosh, Andrei Linde
doaj   +1 more source

Inferring Cosmological Parameters with Evidential Physics-Informed Neural Networks

Universe
We examine the use of a novel variant of Physics-Informed Neural Networks to predict cosmological parameters from recent supernovae and baryon acoustic oscillations (BAO) datasets. Our machine learning framework generates uncertainty estimates for target
Hai Siong Tan
doaj   +1 more source

Cosmological Models with Fractional Derivatives and Fractional Action Functional [PDF]

, 2010
Cosmological models of a scalar field with dynamical equations containing fractional derivatives or derived from the Einstein-Hilbert action of fractional order, are constructed.
A.R. El-Nabulsi, A.R. El-Nabulsi, A.R. El-Nabulsi, A.R. El-Nabulsi, A.R. El-Nabulsi, A.R. El-Nabulsi, A.R. El-Nabulsi, A.R. El-Nabulsi, A.R. El-Nabulsi, A.R. El-Nabulsi, C. Kiefer, D. Baleanu, D. Baleanu, G.S.F. Frederico, G.S.F. Frederico, I. Podlubny, J. Munkhammar, J.W. Norbury, M.D. Roberts, M.F. Li, S. Pelmutter, S.I. Vacaru, V. Sahni, V.K Shchigolev, V.K. Shchigolev, V.V. Kiselev, V.V. Uchaikin   +26 more
core   +1 more source

Quantum cosmological metroland model [PDF]

Classical and Quantum Gravity, 2010
Relational particle mechanics is useful for modelling whole-universe issues such as quantum cosmology or the problem of time in quantum gravity, including some aspects outside the reach of comparably complex minisuperspace models. In this article, we consider the mechanics of pure shape and not scale of 4 particles on a line, so that the only ...
Anderson, E., Franzen, A.T.
openaire   +3 more sources

Opposing consensus science through scholarly practices: The role of claims maintenance

Journal of the Association for Information Science and Technology, EarlyView.
Abstract This study examines how three US‐based communities who oppose consensus science produce and disseminate scholarly‐like artifacts: pro‐life activists, Young Earth Creationists, and Anthropogenic Climate Crisis skeptics. Prior research shows that industry‐ or church‐backed advocacy campaigns often generate claims supported by these communities ...
Irene V. Pasquetto, Morgan Wofford, Claire Jordan, Andrea Thomer   +3 more
wiley   +1 more source

Friction forces in cosmological models

, 2013
We investigate the dynamics of test particles undergoing friction forces in a Friedmann-Robertson-Walker (FRW) spacetime. The interaction with the background fluid is modeled by introducing a Poynting-Robertson-like friction force in the equations of ...
Bini, Donato, Geralico, Andrea, Gregoris, Daniele, Succi, Sauro   +3 more
core   +1 more source