Hairy Holes

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It is an interesting result,” says Avi Loeb of Harvard University, who was not involved in the new work. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. The existence of extra propagating degrees of freedom, makes the stability properties of these BHs richer and more complex than those of GR. This eliminates eight of the eleven numbers, leaving three which are independent of the reference frame: mass, angular momentum magnitude, and electric charge. Other characteristics (such as geometry and magnetic moment) are uniquely determined by these three parameters, and all other information (for which "hair" is a metaphor) about the matter that formed a black hole or is falling into it "disappears" behind the black-hole event horizon and is therefore permanently inaccessible to external observers after the black hole "settles down" (by emitting gravitational and electromagnetic waves).

Robinson, under the additional hypothesis of non-degenerate event horizons and the technical, restrictive and difficult-to-justify assumption of real analyticity of the space-time continuum.The purpose of this issue is to collect some of the interesting models of alternative compact objects and hairy black holes that the community has been studying in recent years, together with discussions of observations that can help discriminate these models.

He has arrived back to childhood home after many year’s estrangement to prepare his recently deceased father’s body for its journey to afterlife. Thus, the awakening of the gravitational astronomy era, together with the ever increasing precision of electromagnetic observations, in particular some targeting black holes and their properties, motivates scrutinizing models of alternative compact objects and their phenomenology.At the heart of the paradox is a problem which has threatened to undermine two of physics most important theories. This further fueled my curiosity so about a week ago myself and two sturdy companions found ourselves standing in a small car park in Hesleden, shivering in the cold and with anticipation of entering Hairy mans hole (get used to the double entendres, theres probably going to be a lot more). We present a survey of the known cosmological and black hole solutions in ghost-free bigravity and massive gravity theories. It might show electric charge, yes; mass, yes; but no other features – or as he put it, "A black hole has no hair". The concept of a causal or event horizon is central to the notion of a black hole,” Professor Hsu said.