Results 81 to 90 of about 1,097,886 (171)

Brane-World Gravity [PDF]

, 2010
The observable universe could be a 1+3-surface (the “brane”) embedded in a 1+3+d-dimensional spacetime (the “bulk”), with Standard Model particles and fields trapped on the brane while gravity is free to access the bulk.
Roy Maartens, Kazuya Koyama, Maartens, Roy, Koyama, Kazuya   +3 more
core   +1 more source

Anthropic reasoning in multiverse cosmology and string theory [PDF]

, 2005
Anthropic arguments in multiverse cosmology and string theory rely on the weak anthropic principle (WAP). We show that the principle, though ultimately a tautology, is nevertheless ambiguous.
Weinstein, Steven, Steven Weinstein
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A branching space-times view on quantum error correction [PDF]

, 2007
In this paper we describe some first steps for bringing the framework of branching space-times to bear on quantum information theory. Our main application is quantum error correction.
Muller, Thomas
core   +1 more source

On the Emergence of Time in Quantum Gravity [PDF]

, 1999
We discuss from a philosophical perspective the way in which the normal concept of time might be said to `emerge' in a quantum theory of gravity. After an introduction, we briefly discuss the notion of emergence, without regard to time (Section 2).
Butterfield, Jeremy, Isham, Chris
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Quantum astrometric observables II: time delay in linearized quantum gravity [PDF]

, 2013
A clock synchronization thought experiment is modeled by a diffeomorphism invariant "time delay" observable. In a sense, this observable probes the causal structure of the ambient Lorentzian spacetime. Thus, upon quantization, it is sensitive to the long
Sub String Theory Cosmology and ElemPart, Béatrice Bonga, Bonga, B., Khavkine, I., Khavkine, Igor, Quantum Gravity, Strings and Elementary Particles, Theoretical Physics, Bonga, Béatrice, Igor Khavkine   +8 more
core   +2 more sources

New ekpyrotic quantum cosmology

Physics Letters B, 2015
Ekpyrotic instantons describe the emergence of classical contracting universes out of the no-boundary quantum state. However, up to now these instantons ended in a big crunch singularity.
Jean-Luc Lehners
doaj   +1 more source

braneworld cosmology and holography [PDF]

, 2002
This thesis is devoted to studying two important aspects of braneworld physics: their cosmology and their holography. We examine the Einstein equations induced on a general (n - 2)-brane of arbitrary tension, embedded in some n-dimensional bulk.
Padilla, Antonio
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Spacetime and the Philosophical Challenge of Quantum Gravity [PDF]

, 2001
We survey some philosophical aspects of the search for a quantum theory of gravity, emphasising how quantum gravity throws into doubt the treatment of spacetime common to the two `ingredient theories' (quantum theory and general relativity), as a 4 ...
Butterfield, Jeremy, Jeremy Butterfield, Christopher Isham, Isham, Chris   +3 more
core   +1 more source

On the Origin of Time and the Universe: A Modern Reappraisal through Quantum Cosmology, the Kalam Argument and Contemporary Scholarship

MetaScientia: Journal of the History and Philosophy of Science
This article reconsiders the origin of the universe by bringing quantum cosmology, the Kalam Cosmological Argument, and Islamic philosophical theology into dialogue while distinguishing more sharply between scientific description, philosophical ...
Sameer Al-Khawaja
doaj   +1 more source

Gravitational Fluctuations as an Alternative to Inflation

Universe, 2019
The ability to reproduce the observed matter power spectrum P ( k ) to high accuracy is often considered as a triumph of inflation. In this work, we explore an alternative explanation for the power spectrum based on nonperturbative quantum field ...
Herbert W. Hamber
doaj   +1 more source