44 research outputs found
Avoidance of singularities in asymptotically safe Quantum Einstein Gravity
New general spherically symmetric solutions have been derived with a
cosmological "constant" \Lambda as a source. This \Lambda field is not constant
but it satisfies the properties of the asymptotically safe gravity at the
ultraviolet fixed point. The importance of these solutions comes from the fact
that they describe the near to the centre region of black hole spacetimes as
this is modified by the Renormalization Group scaling behaviour of the fields.
The consistent set of field equations which respect the Bianchi identities is
derived and solved. One of the solutions (with conventional sign of
temporal-radial metric components) is timelike geodesically complete, and
although there is still a curvature divergent origin, this is never
approachable by an infalling massive particle which is reflected at a finite
distance due to the repulsive origin. Another family of solutions (of both
signatures) range from a finite radius outwards, they cannot be extended to the
centre of spherical symmetry, and the curvature invariants are finite at the
minimum radius.Comment: 15 page
Binary Black Hole Information Loss Paradox & Future Prospects
Various techniques to tackle the black hole information paradox have been
proposed. A new way out to tackle the paradox is via the use of a
pseudo-density operator. This approach has successfully dealt with the problem
with a two qubit entangle system for a single black hole. In this paper, we
present the interaction with a binary black hole system by using an arrangement
of the three qubit system of Greenberger Horne Zeilinger (GHZ) state. We show
that our results are in excellent agreement with the theoretical value. We have
also studied the interaction between the two black holes by considering the
correlation between the qubits in the binary black hole system. The results
depict a complete agreement with the proposed model. In addition to the
verification, we also propose how modern detection of gravitational waves can
be used on our optical setup as an input source, thus bridging the gap with the
gravitational wave's observational resources in terms of studying black hole
properties with respect to quantum information and entanglement
Charge asymmetry in two-Higgs doublet models
We discuss the features of a two-Higgs doublet model exhibiting a two stage
phase transition. At finite temperatures electric charge violating stationary
points are developed. In conjunction with {\em CP} violation in the Higgs or
the Yukawa sector, the phase transition to the charge conserving vacuum,
generates a net charge asymmetry , in the presence of heavy leptons,
which may be well above the astrophysical bounds put on unless the
heavy leptons are sufficiently massive. This type of transition may be of
relevance for supersymmetric extensions of the Standard Model, since it shares
the same features, namely two Higgs doublets and similar {\em CP} violating
sources.Comment: 20 pages, LaTeX file, 5 eps figures included using epsfig macro.
Major revisio