Results 111 to 120 of about 165,969,103 (172)

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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On the physical basis of cosmic time [PDF]

, 2008
In this manuscript we initiate a systematic examination of the physical basis for the time concept in cosmology. We discuss and defend the idea that the physical basis of the time concept is necessarily related to physical processes which could ...
Zinkernagel, Henrik, Rugh, Svend E.
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Open questions of BSM Cosmology

BSM physics, on which the now standard inflationary cosmology with baryosynthesis and dark matter/energy is based, inevitably leads to cosmological scenarios beyond this standard model, involving specific model dependent choice of models and parameters ...
Khlopov, Maxim
core   +1 more source

Towards a post-inflationary composite axion model

Journal of High Energy Physics
Composite axions offer a scenario where the axion emerges as a pion-like state, avoiding fine-tuning of elementary scalars and ameliorating the axion quality problem. Despite these advantages, their post-inflationary cosmology remains largely unexplored,
Aleksandr Azatov, Mohamed Mahdi Khalil, Motoo Suzuki   +2 more
doaj   +1 more source

Traces of Extra Dimensions in Cosmology [PDF]

, 2010
In this thesis, we discuss the observational consequences of extra dimensions on cosmological phenomena. We begin with an overview of extra dimensions, from the initial ideas of Kaluza and Klein to the more recent concept of braneworld models and in ...
O'Callaghan, Eimear Eileen, O'CALLAGHAN, EIMEAR,EILEEN   +1 more
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Cosmic millicharge background and reheating probes

Journal of High Energy Physics
We demonstrate that the searches for dark sector particles can provide probes of reheating scenarios, focusing on the cosmic millicharge background produced in the early universe.
Xucheng Gan, Yu-Dai Tsai
doaj   +1 more source

Harmonic maps, SU (N) skyrme models and yang-mills theories [PDF]

, 2002
This thesis examines the construction of static solutions of (3+l)-dimensional SU{N) Skyrme models, usual and alternative, and pure massive SU(N) Yang-Mills theories.
Wospakrik, Hans Jacobus
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Graviton production from inflaton condensate: Boltzmann vs Bogoliubov

Journal of High Energy Physics
We study graviton production from an oscillating inflaton condensate during reheating by systematically comparing Boltzmann and Bogoliubov descriptions for inflaton potentials of the form V(ϕ) ∝ ϕ n around the minimum. The Bogoliubov framework provides a
Chenhuan Wang, Yong Xu, Wenbin Zhao
doaj   +1 more source

Specially embedding a composite axion model

Journal of High Energy Physics
We present a novel framework of the post-inflationary composite axion to address the strong CP problem without the cosmological domain wall problem. Conventional composite axion models lead to the domain wall number greater than one, producing stable ...
Shihwen Hor, Yuichiro Nakai, Motoo Suzuki, Junxuan Xu   +3 more
doaj   +1 more source

The Arrow of Time in Cosmology [PDF]

, 2002
Scientific cosmology is an empirical discipline whose objects of study are the large-scale properties of the universe. In this context, it is usual to call the direction of the expansion of the universe the "cosmological arrow of time". However, there is
Castagnino, Mario, Lara, Luis, Lombardi, Olimpia   +2 more
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