9,783 research outputs found
Black Hole as a Wormhole Factory
On general grounds, one may argue that a black hole stops radiation at the
Planck mass, where the radiated energy is comparable to the black hole's mass.
And also, it has been argued that there would be a "wormhole-like" structure,
known as "space-time foam", due to large fluctuations below the Planck length.
In this paper, as an explicit example, we consider an exact classical solution
which represents nicely those two properties in a recently proposed quantum
gravity model based on different scaling dimensions between space and time
coordinates. The solution, called "Black Wormhole", consists of two different
states, depending on its mass M and an IR parameter omega: For the black hole
state, a non-traversable wormhole occupies the interior region of the black
hole around the singularity at the origin, whereas for the wormhole state, the
interior wormhole is exposed to an outside observer as the black hole horizon
is disappeared from evaporation. The black hole state becomes thermodynamically
stable as it approaches to the merge point where the interior wormhole throat
and the black hole horizon merges, and the Hawking temperature vanishes at the
exact merge point. This solution suggests the "Generalized Cosmic Censorship"
by the existence of a wormhole-like structure which protects the naked
singularity even after the black hole evaporation. One could understand the
would-be wormholes inside the black hole horizon as the results of microscopic
wormholes created by "negative" energy quanta which have entered the black hole
horizon in Hawking radiation processes: The quantum black hole could be a
wormhole factory. It is found that this speculative picture may be consistent
with the recent "ER=EPR" proposal for resolving the recent black hole
entanglement debates.Comment: Added some more words on (1) the transition between the black hole
phase and wormhole phase and (2) the notion of a wormhole "factory" in Fig.
5. Updated references, Accepted in PL
The 750 GeV Diphoton Excess May Not Imply a 750 GeV Resonance
We discuss non-standard interpretations of the 750 GeV diphoton excess
recently reported by the ATLAS and CMS Collaborations which do not involve a
new, relatively broad, resonance with a mass near 750 GeV. Instead, we consider
the sequential cascade decay of a much heavier, possibly quite narrow,
resonance into two photons along with one or more invisible particles. The
resulting diphoton invariant mass signal is generically rather broad, as
suggested by the data. We examine three specific event topologies - the antler,
the sandwich, and the 2-step cascade decay, and show that they all can provide
a good fit to the observed published data. In each case, we delineate the
preferred mass parameter space selected by the best fit. In spite of the
presence of invisible particles in the final state, the measured missing
transverse energy is moderate, due to its anti- correlation with the diphoton
invariant mass. We comment on the future prospects of discriminating with
higher statistics between our scenarios, as well as from more conventional
interpretations.Comment: Discussion about the ATLAS Moriond EW2016 added. Matched to PRL
accepted versio
Influencing Factors on Knowledge Adoption of Mobile Game Developers in Online Communities
Recently, with the advance of wireless Internet access via mobile devices, a myriad of game development companies has forayed into the mobile game market, leading to intense competition. To survive in this fierce competition, mobile game developers often try to get a grasp of the rapidly changing needs of their customers by operating their own official communities where game users freely leave their requests, suggestions, and ideas relevant to focal games. Based on the heuristic-systematic model (HSM) and data quality (DQ) framework, this study derives key content, non-content, and hybrid cues that can be utilized when game developers accept suggested postings in these online communities. The results of the hierarchical multiple regression analysis show relevancy, timeliness, amount of writing, and the number of comments are positively associated with mobile game developers’ knowledge adoption. In addition, title attractiveness mitigates the relationship between amount of writing/the number of comments and knowledge adoption
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