scholarly journals The Brownian plane with minimal neck baby universe

2017 ◽  
Vol 51 (4) ◽  
pp. 729-752
Author(s):  
Yuting Wen
Keyword(s):  
Baby Universe

scholarly journals Wormhole calculus, replicas, and entropies

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Steven B. Giddings ◽  
Gustavo J. Turiaci
Keyword(s):  
Black Hole ◽  
Probability Distributions ◽  
Information Loss ◽  
Coupling Constants ◽  
Quantum Mechanical ◽  
Standard Description ◽  
Standard Quantum ◽  
Black Hole Information ◽  
Baby Universes ◽  
Baby Universe

Abstract We investigate contributions of spacetime wormholes, describing baby universe emission and absorption, to calculations of entropies and correlation functions, for example those based on the replica method. We find that the rules of the “wormhole calculus”, developed in the 1980s, together with standard quantum mechanical prescriptions for computing entropies and correlators, imply definite rules for limited patterns of connection between replica factors in simple calculations. These results stand in contrast with assumptions that all topologies connecting replicas should be summed over, and call into question the explanation for the latter. In a “free” approximation baby universes introduce probability distributions for coupling constants, and we review and extend arguments that successive experiments in a “parent” universe increasingly precisely fix such couplings, resulting in ultimately pure evolution. Once this has happened, the nontrivial question remains of how topology-changing effects can modify the standard description of black hole information loss.

scholarly journals A toy model for a baby universe inside a black hole

2020 ◽  
Vol 80 (5) ◽  
Author(s):  
Hrishikesh Chakrabarty ◽  
Ahmadjon Abdujabbarov ◽  
Daniele Malafarina ◽  
Cosimo Bambi
Keyword(s):  
Black Hole ◽  
Baby Universe

scholarly journals Classical conformality in the Standard Model from Coleman’s theory

2016 ◽  
Vol 31 (31) ◽  
pp. 1650176
Author(s):  
Kiyoharu Kawana
Keyword(s):  
Standard Model ◽  
Gauge Hierarchy ◽  
The Standard Model ◽  
Baby Universe

The classical conformality (CC) is one of the possible candidates for explaining the gauge hierarchy of the Standard Model (SM). We show that it is naturally obtained from the Coleman’s theory on baby universe.

Life in the Baby Universe

Physics World ◽  
2013 ◽  
Vol 26 (09) ◽  
pp. 56-56
Author(s):  
Philip Shemella
Keyword(s):  
Baby Universe

scholarly journals DENOUEMENT OF A WORMHOLE–BRANE ENCOUNTER

2009 ◽  
Vol 18 (12) ◽  
pp. 1809-1819
Author(s):  
ENRICO RODRIGO
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Brane World ◽  
Dark Matter Candidate ◽  
Brane Worlds ◽  
Higher Dimensional ◽  
The Creation ◽  
World Ethos ◽  
Baby Universe

Higher-dimensional black holes have long been considered within the context of brane worlds. Recently, it was shown that the brane-world ethos also permits the consideration of higher-dimensional wormholes. When such a wormhole, pre-existing in the bulk, impinges upon our universe, taken to be a positive-tension three-brane, it can induce the creation in our universe of a wormhole of ordinary dimensionality. The throat of this wormhole might fully constrict, pinch off, and thus birth a baby universe. Alternatively, the induced wormhole might persist. I show that persistence is more likely and note that the persistent wormhole manifests itself as a particle-like object whose interaction with cosmic matter is purely gravitational. I consider the viability of this object as a dark matter candidate.

scholarly journals Gamma and Beta Model of Growing and Rotating Planck Ball

2019 ◽  
Author(s):  
Satya Seshavatharam U.V ◽  
S. Lakshminarayana
Keyword(s):  
Dark Matter ◽  
Large Scale ◽  
Density Ratio ◽  
Planck Scale ◽  
Matter Density ◽  
Cosmic Acceleration ◽  
Expansion Velocity ◽  
Dark Matter Density ◽  
Density Ratios ◽  
Baby Universe

With reference to Planck scale, Mach’s relation, increasing support for large scale cosmic anisotropy and preferred directions and by introducing two new parameters Gamma and Beta, right from the beginning of Planck scale, we make an attempt to estimate ordinary matter density ratio, dark matter density ratio, mass, radius, temperature, age and expansion velocity (from and about the baby universe in all directions). We would like suggest that, from the beginning of Planck scale, 1) Dark matter can be considered as a kind of cosmic foam responsible for formation of galaxies. 2) Cosmic angular velocity is directly proportional to squared cosmic temperature. 3) Ratio of critical temperature to actual temperature plays a heuristic role in understanding ordinary and dark matter density ratios. 4) Cosmic expansion velocity increases with decreasing total matter density ratio. 5) There is no need to consider dark energy for understanding cosmic acceleration.

Baby universe metric equivalent to an interior black-hole metric

1991 ◽  
Vol 261 (4) ◽  
pp. 357-362 ◽  
Author(s):  
Pedro F. González-Díaz
Keyword(s):  
Black Hole ◽  
Baby Universe

scholarly journals MINBU Distribution of Two-Dimensional Quantum Gravity: Simulation Result and Semiclassical Analysis

1997 ◽  
Vol 12 (04) ◽  
pp. 757-780 ◽  
Author(s):  
S. Ichinose ◽  
N. Tsuda ◽  
T. Yukawa
Keyword(s):  
Quantum Gravity ◽  
Central Charge ◽  
Surface Topology ◽  
Two Dimensional ◽  
Semiclassical Analysis ◽  
Semiclassical Approach ◽  
Infrared Regularization ◽  
Derivative Term ◽  
Total Derivative Term ◽  
Baby Universe

We analyze the MINBU distribution of two-dimensional quantum gravity. New data of R2-gravity by the Monte Carlo simulation and its theoretical analysis by the semiclassical approach are presented. In the distribution, the cross-over phenomenon takes place at some size of the baby universe where the randomness competes with the smoothing (or roughening) force of R2-term. The dependence on the central charge cm and on the R2-coupling are explained for R2-gravity, which includes the ordinary 2d quantum gravity. The R2-Liouville solution plays the central role in the semiclassical analysis. A total derivative term (surface term) and the infrared regularization play important roles. The surface topology is that of a sphere.

scholarly journals STOCHASTIC QUANTIZATION APPROACH FOR CAUSAL DYNAMICAL TRIANGULATION STRING FIELD THEORY

2013 ◽  
Vol 28 (06) ◽  
pp. 1350013 ◽  
Author(s):  
HIROSHI KAWABE
Keyword(s):  
Field Theory ◽  
String Field Theory ◽  
Continuum Limit ◽  
Geodesic Distance ◽  
Closed String ◽  
Target Space ◽  
Stochastic Quantization ◽  
Additional Interaction ◽  
Dynamical Triangulation ◽  
Baby Universe

We construct a two-dimensional (2D) causal dynamical triangulation (CDT) model from a matrix model which represents the loop gas model of closed string. The target-space index is reinterpreted as time or geodesic distance. We apply stochastic quantization method to the model to obtain the Generalized CDT (GCDT), which has additional interaction of creating baby universe. If we take a specific scaling in continuum limit, we realize an extended GCDT model characterized by the noncritical string field theory.

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