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3 edition of Constraints on cosmic strings due to black holes formed from collapsed cosmic string hoops found in the catalog.

Constraints on cosmic strings due to black holes formed from collapsed cosmic string hoops

Constraints on cosmic strings due to black holes formed from collapsed cosmic string hoops

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Published by Fermi National Accelerator Library, National Aeronautics and Space Administration, National Technical Information Service, distributor in [Batavia, Ill.], [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Black holes (Astronomy)

  • Edition Notes

    StatementR.R. Caldwell and Evalyn Gates.
    Series[NASA contractor report] -- NASA CR-193248., NASA contractor report -- NASA CR-193248.
    ContributionsGates, Evalyn., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14699022M

    Cosmic distances: One of the major problems in astronomy is measuring very large distances in the universe. The current most common methods measure relative distances, but now research from the Niels Bohr Institute demonstrates that precise distances can be measured using supermassive black holes.


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Constraints on cosmic strings due to black holes formed from collapsed cosmic string hoops Download PDF EPUB FB2

The cosmological features of primordial black holes formed from collapsed cosmic string loops are studied. Observational restrictions on a population of primordial black holes are used to restrict f, the fraction of cosmic string loops which collapse to form black holes, Constraints on cosmic strings due to black holes formed from collapsed cosmic string hoops book {mu}, the cosmic string.

The cosmological features of primordial black holes formed from collapsed cosmic string loops are studied. Observational restrictions on a population of primordial black holes are used to restrict f, the fraction of cosmic string loops which collapse to form black holes, and μ, the cosmic string mass per unit length.

Using a realistic model of cosmic strings, we find that the energy density Cited by: The cosmological features of primordial black holes formed from collapsed cosmic string loops are studied.

Observational restrictions on a population of primordial black holes are used to restrict f, the fraction of cosmic string loops which collapse to form black holes, and mu, the cosmic string mass-per-unit length. Using a realistic model of cosmic strings, we find the strongest restriction Author: R.

Caldwell, Evalyn Gates. A small fraction, f, of cosmic string loops can collapse to form primordial black holes (PBHs). Constraints on the abundance of PBHs can therefore be used to constrain f. Primordial black holes (PBH) may have formed from the collapse of cosmic string loops.

The spectral shape of the PBH mass spectrum can be determined by the scaling argument for string networks. Limits on the spectral amplitude derived from extragalactic γ-ray and Galactic γ-ray and cosmic ray flux observations as well as constraints from the possible formation of stable black hole remnants Cited by:   It is shown that the world-sheet of a stationary string, that passes the static limit of the 4-D Kerr-Newman black hole, describes a 2-D black hole.

Mathematical results for 2-D black holes can therefore be applied to physical objects; (say) cosmic strings in the vicinity of Kerr black holes. As an immediate general result, it follows that the. The idea of relativistic Nambu-Goto string is used to model the hypothetical cosmic loops.

The percentage of black holes formed from collapsed cosmic loops is reconsidered. The results are found to be different from those obtained by other authors. We examine whether the deformation of a cosmic string, induced by the gravitational field of a Kerr black hole, may lead to the formation of a loop of cosmic string.

The segment of the string which enters the ergosphere of a rotating black hole gets deformed and, if it is sufficiently twisted, it can self-intersect chopping off a loop of cosmic.

In this work we propose an alternative scenario for the formation of SMBH in the early Universe, in which energy transfer from superconducting cosmic strings piercing small seed black holes is the main physical process leading to rapid mass increase.

Black holes: Cosmic signal rattles Earth after 7 billion years A black hole is a region of space where matter has collapsed in on itself formed is unknown ; Black holes.

A rotating black hole threaded by an infinitely long cosmic string is studied in the framework of the Abelian Higgs model. We show that contrary to a common belief, in the presence of rotation the backreaction of the string does not induce a simple conical deficit.

This leads to new distinct features of the Kerr--string system such as modified ISCO or shifted ergosphere, though these effects. IntroductionIt is well known that primordial black holes (PBHs) could have formed in the early Unive A simple comparison of the cosmological density at time t with the density associated with a black hole shows that PBHs forming at time t would have of order the horizon mass: (1) M H (t) c 3 t G 10 15 t 10 23 s g.

PBHs could thus span an enormous mass range: those formed. Finally, we note that while the impact of the cosmological history on the density perturbation constraint is quite modest due to the exponential dependence of the formation rate, the change can be much more significant for other formation mechanisms, such as cosmic strings where the black hole formation rate is a power-law of the mass per unit.

Stephen Hawking wrote papers on how the loops might collapse to form black holes. Others got interested in how they bend and twist in space.

predict cosmic strings of one form. The Mysterious Cosmic Strings. By Paul Sutter Octo These weird defects in space-time should be out there, somewhere. Cosmic-string loops. Cosmic string loops that shrink by a factor of order 1Gμ will form black holes.

I estimate that a fraction of order (Gμ)2x4 of loops will form black holes, where xLs, and s is the. A new model for cosmic strings (i.

conical singularities) attached to black holes is proposed. These string are obtained by a explicit construction via limiting process from the so-called Bonnor rocket. This reveals quite surprising nature of their stressenergy tensor which contains first derivative of Dirac delta δ distribution.

Starting from the Bonnor rocket we explicitly. this point, a black-hole driven wind evacuates gas from the nascent galaxy, limiting additional star formation and further black hole growth (Silk Rees ; Fig.

Further episodes of merger-driven star formation, accretion, and feedback are expected to proceed through cosmic time.

This provides a. Some black hole-cosmic string models such as ReissnerNordström, RNde Sitter, KerrNewman and multi-black holes with cosmic string are given.

Energy and angular momentum of a timelike particle in circular orbits in multi-black hole spacetime are calculated. Cosmic strings and primordial black holes (PBHs) commonly and naturally form in many scenarios describing the early universe.

Here we show that if both cosmi. Title: Cosmic String Loop Collapse in Full General Relativity Authors: Thomas Helfer, Josu C. Aurrekoetxea, Eugene A. Lim (Submitted on 20. It is shown that the world-sheet of a stationary string, that passes the static limit of the 4-D Kerr-Newman black hole, describes a 2-D black hole.

Mathematical results for 2-D black holes can therefore be applied to physical objects; (say) cosmic strings in the vicinity of Kerr black holes. As an immediate general result, it follows that the.

Primordial black hole formation by cosmic string collapse is reconsidered when the winding number of the string is larger than the unity. The line energy density of the multiple winding string becomes greater than that of the single winding string so that the probability of the black hole formation by the string collapse during the loop oscillation would be strongly enhanced.

One of my current research interests is in the geometry of constant-mean-curvature time-like submanifolds of Minkowski space.

A special case of this is the study of cosmic strings under the Nambu-Goto action. Mathematically the classical (as opposed to quantum) behavior of such strings are quite well understood, by combining the works of theoretical physicists since the 80s (especially those.

It sounds like the intro to a science fiction B movie. Billions and billions of years ago, after the universe exploded into being and began to cool off from the fires of creation, cracks formed in the fabric of spacetime hold the script for a second.

This is supposed to have actually happened. Cosmic cracks or strings are thought to be remnants of the Big Bang. These fissures are.

Possible manifestations of small mass black holes (M BHcosmic bodies (stars, millisecond pulsars, planets, etc. ) are considered. The formation of millisecond pulsars in the early proposed pulsar's model goes onto a small black hole in the centre due to accretion of neutron star matter.

Within the framework of a model under consideration, the following is predicted: millisecond. string theory and the theory of cosmic strings. We refer to [23, 26, 32] regarding the existence (or inexistence) of cosmic strings in view of CMB measurements collected by the Planck Surveyor mission in The singularities of which potential detectability is interesting to study include cosmic stings, monopoles, cosmic walls and black holes.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): We examine the question of collapse of Turoks two-parameter family of cosmic strings. We first perform a classification of the strings according to the specific time(s) at which the minimal string size is reached during one period.

We then obtain an exact analytical expression for the probability of collapse to. It sounds like something the crew of the USS Enterprise might stumble upon in an episode of Star Trek, but a cosmic string might be more than just science fiction, according to researchers at the University of California, Berkeley.

While we cant see them now, computer models of the elusive, one-dimensional objects suggest they may actually be detectable. article{osti_, title {Cosmic strings and black holes}, author {Aryal, M and Ford, L H and Vilenkin, A}, abstractNote {The metric for a Schwarzschild black hole with a cosmic string passing through it is discussed.

The thermodynamics of such an object is considered, and it is shown that S (14)A, where S is the entropy and A is the horizon area. These cosmic strings could stretch the length of the universe.

A piece of this string only kilometers long would weigh more than the earth. Others have added to the theory: That symmetry still. A team of astronomers has captured the image of a cosmic filament that seems to enter the giant black hole, called Sagittarius A (Sgr A), at the center of the Milky Way galaxy.

The filament. Cosmic strings are hypothetical 1-dimensional topological defects which may have formed during a symmetry-breaking phase transition in the early universe when the topology of the vacuum manifold associated to this symmetry breaking was not simply is expected that at least one string per Hubble volume is formed.

Their existence was first contemplated by the theoretical physicist. Cosmic strings are associated with models in which the sets of minima are not simply-connected, that is, the vacuum manifold has 'holes' in it.

The minimum energy states on the left form a circle and the string corresponds to a non-trivial winding around this. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The string equations of motion and constraints are solved for a ring shaped Ansatz in cosmological and black hole spacetimes.

In FRW universes with arbitrary power behavior [R(X0) a |X0 | α], the asymptotic form of the solution is found for both X0 0 and X0 and we plot the numerical solution for all times.

These growing black holes are placed in a host halo of neutral hydrogen where the effects of the ionizingheating front radius can be related to an observable differential brightness temperature, ΔT b, which measures the difference between the background Cosmic Microwave Background temperature and the neutral hydrogen 21cm results for a black hole with an.

Cosmic voids - vast underdense regions, forming an essential feature of the cosmic web and occupying most of the volume of the Universe - could contain as much as 20 of.

Cosmic superstrings are introduced to non-experts. First D-branes and (p, q) (p,q) (p, q) strings are discussed. Then we explain how tachyon condensation in the early universe may have produced F, D and (p, q) (p,q) (p, q) strings.

Warped geometries which can render horizon sized superstrings relatively light are discussed. In this paper we propose a model for the formation of the cosmological voids. We show that cosmological voids can form directly after the collapse of extremely large wavelength perturbations into low-density black holes or cosmological black holes (CBH).

Consequently the voids are formed by the comoving expansion of the matter that surrounds the collapsed perturbation. It follows that the. Composite image of the cosmic ring seen million light-years away from Earth.

According to scientists, this structure could either be hosting black holes or neutron stars. Some researchers propose the black holes that slammed into each other were primordial, meaning they've been around since shortly after the Big Bang and follow their own set of cosmic guidelines.

Black holes can be classified according to their mass—two different kinds have been identified: black holes with a mass several times bigger than the Sun; and supermassive black holes that lie in the centre of most galaxies (the largest type of black hole), containing a mass billions of times the mass of the Sun.

Intermediate-mass black holes are the elusive missing link; despite the. Supermassive black holes are the largest black holes, with masses that can exceed a billion Suns.

Just this spring, the first-ever image of the supermassive black hole .