4,929 research outputs found
On the many saddle points description of quantum black holes
Considering two dimensional gravity coupled to a CFT, we show that a
semiclassical black hole can be described in terms of two Liouville theories
matched at the horizon. The black hole exterior corresponds to a space-like
while the interior to a time-like Liouville theory. This matching automatically
implies that a semiclassical black hole has an infinite entropy. The path
integral description of the time-like Liouville theory (the Black Hole
interior) is studied and it is found that the correlation functions of the
coupled CFT-gravity system are dominated by two (complex) saddle points, even
in the semiclassical limit. We argue that this system can be interpreted as two
interacting Bose-Einstein condensates constructed out of two degenerate quantum
states. In AdS/CFT context, the same system is mapped into two interacting
strings intersecting inside a three-dimensional BTZ black hole. Finally, we
discuss why, beyond the semiclassical approximation, we expect no firewalls
appearing in our system.Comment: 11 pages, RevTeX; v2 clarifications and references adde
Scalar perturbations in p-nflation: the 3-form case
We calculate the primordial spectrum of scalar perturbations of the 3-form
inflation and we find that the curvature perturbations decay at late times. As
as result, although a non-minimally coupled massive 3-form field may drive
inflation at early times, it should be assisted by other fields in order to
reproduce the observed temperature fluctuations of the CMB sky.Comment: 13 pages; v4: clarifications added. Comment on the gravitational
instability of 1- and 2-form inflation added. Version accepted in JCA
The Environmental Enforcement in the Civil and the Common Law Systems. A Case on the Economic Effects of Legal Institutions
This paper aims to give a comparative analysis on the different enforcement approaches in respect to both civil and common law systems (i.e. Europe vs. USA) by analyzing some crucial aspects of their underlying normative systems. Therefore, the role of the juridical institutions in these two diverse contexts is analyzed, in order to identify the economic efficiency implications based upon the theory of public enforcement of environmental laws.environmental enforcement, economic analysis of law, common law, civil law.
A new type of scalar field inflation
In this short note we discuss the possibility of producing a slow rolling
inflationary background by considering a massive scalar field whose kinetic
term is non-minimally coupled to gravity.Comment: 5 pages; Proceedings of 'Invisible Universe International
Conference', Paris, June 29- July 3, 2009; v3 references and clarification
added; accepted for publicatio
Cosmological Perturbations in the New Higgs Inflation
We study the cosmological perturbations created during the New Higgs
inflationary phase. In the New Higgs Inflation, the Higgs boson is kinetically
coupled to the Einstein tensor and only three perturbative degrees of freedom,
a scalar and two tensorial (gravitational waves), propagate during Inflation.
Scalar perturbations are found to match the latest WMAP-7yrs data within
Standard Model Higgs parameters. Primordial gravitational waves also, although
propagating with superluminal speed, are consistent with present data. Finally,
we estimate the values of the parameter of the New Higgs Inflation in relation
to the Higgs mass, the spectral index and amplitude of the primordial scalar
perturbations showing that the unitarity bound of the theory is not violated.Comment: v3: 11 pages; citation corrected. Version accepted in JCA
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