Zobrazeno 1 - 10
of 176
pro vyhledávání: '"Parker, Leonard"'
Autor:
Parker, Leonard, Navarro-Salas, Jose
In the early sixties Leonard Parker discovered that the expansion of the universe can create particles out of the vacuum, opening a new and fruitfull field in physics. We give a historical review in the form of an interview that took place during the
Externí odkaz:
http://arxiv.org/abs/1702.07132
Autor:
Parker, Leonard
Quantum creation processes during the very rapid early expansion of the universe are believed to give rise to temperature anisotropies and polarization patterns in the CMB radiation. These have been observed by satellites such as COBE, WMAP, and PLAN
Externí odkaz:
http://arxiv.org/abs/1503.00359
Autor:
Parker, Leonard
I describe the logical basis of the method that I developed in 1962 and 1963 to define a quantum operator corresponding to the observable particle number of a quantized free scalar field in a spatially-flat isotropically expanding (and/or contracting
Externí odkaz:
http://arxiv.org/abs/1205.5616
Publikováno v:
JCAP 1205 (2012) 019
We compute the primordial trispectrum for curvature perturbations produced during cosmic inflation in models with standard kinetic terms, when the initial quantum state is not necessarily the vacuum state. The presence of initial perturbations enhanc
Externí odkaz:
http://arxiv.org/abs/1112.1581
We briefly review the need to perform renormalization of inflationary perturbations to properly work out the physical power spectra. We also summarize the basis of (momentum-space) renormalization in curved spacetime and address several misconception
Externí odkaz:
http://arxiv.org/abs/1108.0949
Autor:
Agullo, Ivan, Parker, Leonard
Publikováno v:
Gen.Rel.Grav. 43 (2011) 2541-2545, Int.J.Mod.Phys. D20 (2011) 2861-2866
Inflation provides a natural mechanism to account for the origin of cosmic structures. The generation of primordial inhomogeneities during inflation can be understood via the spontaneous creation of quanta from the vacuum. We show that when the corre
Externí odkaz:
http://arxiv.org/abs/1106.4240
Autor:
Agullo, Ivan, Parker, Leonard
Publikováno v:
Phys.Rev.D83:063526,2011
Cosmological inflation generates a spectrum of density perturbations that can seed the cosmic structures we observe today. These perturbations are usually computed as the result of the gravitationally-induced spontaneous creation of perturbations fro
Externí odkaz:
http://arxiv.org/abs/1010.5766
Publikováno v:
Phys.Rev.Lett.105:211305,2010
The exponential blueshift associated with the event horizon of a black hole makes conformal symmetry play a fundamental role in accounting for its thermal properties. Using a derivation based on two-point functions, we show that the spectrum of therm
Externí odkaz:
http://arxiv.org/abs/1006.4404