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Tuesday, July 28, 2020 | History

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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  • 11 Currently reading

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

    @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 = (1/4)A, where S is the entropy and A is the horizon area. @article{osti_, title = {Local constraints on cosmic string loops from photometry and pulsar timing}, author = {Pshirkov, M S and Tuntsov, A V and Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, }, abstractNote = {We constrain the cosmological density of cosmic string loops using two observational signatures--gravitational microlensing and the Kaiser.

    Some black hole-cosmic string models such as Reissner–Nordström, RN–de Sitter, Kerr–Newman and multi-black holes with cosmic string are given. Energy and angular momentum of a timelike particle in circular orbits in multi-black hole space–time are calculated. Compared to cosmic strings, black holes seem downright sensible. These strings - no relation to the subatomic strings of theoretical physics - are one-dimensional objects, meaning they have length.

    A black hole gets hotter the smaller it is. A white black hole should have the size of a bacterium, and the mass of a continent. Such black holes, while theoretically possible, are not known to be naturally produced anywhere in the universe. Black holes that are naturally produced have masses bigger than the Sun and sizes bigger than a few miles.   Cracks, called cosmic strings, are topological defects in spacetime that might have formed when the universe was young. Experiments haven’t found any proof that cosmic strings .


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

Constraints on cosmic strings due to black holes formed from collapsed cosmic string loops Article (PDF Available) in Physical review D: Particles and fields 48(6) October with.

Get this from a library. Constraints on cosmic strings due to black holes formed from collapsed cosmic string hoops. [R R Caldwell; Evalyn Gates; United. We've blown through black holes and wormholes, but there's yet another possible means of time traveling via theoretic cosmic phenomena.

For this scheme, we turn to physicist J. Richard Gott, who introduced the idea of cosmic string back in As the name suggests, these are stringlike objects that some scientists believe were formed in the early : Kevin Bonsor & Robert Lamb.

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 and primordial black holes (PBHs) commonly and naturally form in many scenarios describing the early universe.

Here we show that if both cosmic strings and PBHs are present, their interaction leads to a range of interesting consequences. At the time of their formation, the PBHs get attached to the strings and influence their evolution, leading to the formation of black-hole Cited by: 3.

Focusing on cosmic string loops, we show that they collapse due to their tension and can either (i) unwind and disperse or (ii) form a black hole, depending on their tension Gμ and initial radius.

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. Cosmic string loops that shrink by a factor of order 1/Gμ will form black holes. I estimate that a fraction of order (Gμ) 2x−4 of loops will form black holes, where x=L/s, and s is the correlation length of the gh this fraction is very low, the emission of γ-rays from these little black holes could be significant.

it is possible for a topologically stable string to end at a black hole [11, 7]. Then the C-metric can be interpreted as providing a picture of a pair of black holes formed by the breaking of a cosmic string and which are subsequently being pulled apart by the string tension.

Cosmic strings are thought to be one-dimensional topological solitons that formed in the early universe during phase transitions [3]. Locally, the string does not produce a gravitational field, but is globally conical.

That means, outside the string, we see observable effects like light deflection [4, 5]. There are studies on finding cosmic. anything to constrain the properties of cosmic strings. The constraints we obtained are the most stringent to date for some regions of the cosmic string parameter space.

This new result places limits on physical models of cosmic strings and could be used to generate more accurate simulations of a string. Constraints on cosmic strings due to black holes formed from collapsed cosmic string loops. Find all books from National Aeronaut Administration (NASA).

At you can find used, antique and new books, compare results and immediately purchase your selection at. The place of cosmic strings and other topological defects in modern cosmology is reviewed, particularly focussing on their potential role in large-scale structure formation.

Most emphasis is given to cosmic strings but the cosmological implications of global monopoles and global textures are also summarized. Schwarzschild black hole pierced by cosmic string Kerr black hole pierced by cosmic string Schwarzschild black holes pierced by cosmic strings Static black hole pierced by infinitely thin cosmic string cosmic string is long-range hair r = 2M: event horizon Betti Hartmann Geodesic motion in cosmic string space-times.

3. Evaporation of primordial black holes. A black hole of mass M will emit particles in the energy range (Q, Q+ d Q) at a rate (4) d N ̇ = Γ d Q 2 π ℏ exp Q T ±1 −1, where T is the black hole temperature, Γ is the absorption probability and the + and − signs refer to fermions and bosons respectively.

This assumes that the hole has no charge or angular momentum. This is a reasonable. Our universe may be riddled with defects in space-time known as cosmic strings. Though we don't have any evidence yet that they exist, they may still be out there, and I. If the address matches an existing account you will receive an email with instructions to reset your password.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): We examine the question of collapse of Turok’s 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. 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. talk outline focus on ordinary cosmic strings. cosmic string evolution and radiation cmb spectrum from cosmic strings - two fiducial models (nambu & abelian higgs) constraint: gravitational wave spectrum from cosmic strings - crucial questions: what is the emission spectrum & size of formation for loops.

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.The fraction of cosmic string loops which collapse to form black holes is estimated using a set of realistic loops generated by loop fragmentation.

The smallest radius sphere into which each cosmic string loop may fit is obtained by monitoring the loop through one period of oscillation.We study linearized perturbations on cosmic strings, taking into account the frictional force due to the interaction of strings with matter.

We then analyze the formation of black holes through collapsing loops of strings. Such black holes can evaporate via Hawking radiation, producing γ-bursts.