Further Spectroscopic Observations of the CSL 1 Object

Sazhin, M. V.; Capaccioli, M.; Longo, Giuseppe; Paolillo, M.; Khovanskaya, O. S.

doi:10.1086/499429

Cited by 36 publications

(30 citation statements)

References 18 publications

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“…Although cosmic string cannot occupy dominant fraction of the energy density of the universe, its non-negligible population is still allowed observationally [40,41]. In fact, Sazhin et al [42,43] reported that CSL-1, which is a double image of elliptical galaxies with angular separation 1.9 arcsec, could be the first case of the gravitational lensing by a cosmic string with Gµ ≈ 4 × 10 −7 .…”

Section: Introductionmentioning

confidence: 99%

Exact wave propagation in a spacetime with a cosmic string

2006

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We present exact solutions of the massless Klein-Gordon equation in a spacetime in which an infinite straight cosmic string resides. The first solution represents a plane wave entering perpendicular to the string direction. We also present and analyze a solution with a static point-like source. In the short wavelength limit these solutions approach the results obtained by using the geometrical optics approximation: magnification occurs if the observer lies in front of the string within a strip of angular width 8πGµ, where µ is the string tension. We find that when the distance from the observer to the string is less than 10 −3 (Gµ) −2 λ ∼ 150Mpc(λ/AU)(Gµ/10 −8 ) −2 , where λ is the wave length, the magnification is significantly reduced compared with the estimate based on the geometrical optics due to the diffraction effect. For gravitational waves from neutron star(NS)-NS mergers the several lensing events per year may be detected by DECIGO/BBO.

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Section: Introductionmentioning

confidence: 99%

Exact wave propagation in a spacetime with a cosmic string

2006

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“…The other possible explanation, that of a rare chance alignment of two identical giant ellipticals at the same redshift seemed very unlikely due to a series of odd circumstances: the two ellipticals should have been relatively near, = 11 kpc, each other, and in spite of this, undistorted, with identical (within the errors) spectra, and residing in a relatively low density environment (no other galaxies could be detected in the same region). Even though at the end it was proved that, in spite of all odds, this was the case [23], the detailed study of this anomalous object allowed to investigate in some detail another aspect of the expected observational effects induced by cosmic strings [13,17,22,24].…”

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confidence: 99%

Gravitational Lens Images Generated by Cosmic Strings

Sazhin¹,

Sazhina²,

Capaccioli³

et al. 2010

TOAAJ

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Abstract:In this review paper the current understanding on the properties of cosmic strings is shortly outlined with special emphasis on the observational signatures which can be expected both in the optical, through gravitational lensing, and in the radio, through anisotropies in the cosmic microwave background. The experience gathered during the long term investigation of the former candidate CSL-1 is also shortly summarized.Keywords: Cosmology, cosmic string, quasars, gravitational lensing, the CMBR anisotropy. COSMIC STRINGS: GENERALITIES AND THEIR ROLE IN PARTICLE PHYSICSThe topological defects of space-time known as cosmic strings were introduced in the late seventies by Kibble [1] and have been extensively discussed over the past decades by several authors [2,3].Their existence finds support in a large class of early Universe models based on the superstring theory [4][5][6]. Cosmic strings are in fact predicted by compactification models, in theories with extended additional dimensions, and are easily justified within the current inflationary scenarios. It is important to stress that in comparision with other topological defects such as monopoles, domain walls, textures, etc., cosmic strings are the most likely to exist.Nowadays, inflation finds a widespread consensus within the cosmological community and is in good agreement with observational astronomical data. On the other end, the braneantibrane inflationary mechanism is the most natural model arising from superstring theories (being one of the most promising to achieve a full description of the Universe at Planckian time-scales) theory tells us that, within this mechanism, inflation ends when the brane and the antibrane annihilate. This process is likely to generate an extremely rich spectrum of post-inflationary remnants. Cosmic strings are among the most likely remnants with a rather rich spectrum.Without any doubt, the discovery of any of such objects would lead to a quantum leap in many fields of fundamental physics and, more specifically, in understanding the rules of GUT and the processes occurring in the pre-inflationary Universe. The linear density of a string (or its tension) *Address correspondence to this author at the Sternberg Astronomical Institute, Moscow State University, University pr. 13, Moscow, Russia; Tel: +7 495 939 50 06; Fax: +7 495 932 88 41; E-mail: miksazhin@yandex.ru depends in fact on the symmetry breaking scale. The specific equation which links these two values depends both on the model of phase transition and on the specific form of the scalar field potential. In the case of a global U(1) string (i.e. the simplest case with winding number n = 1), the equation is, [7]:where vac is the energy density of the false vacuum and H is the Compton wavelenght of the Higgs boson. Here μ has dimension of linear density.The most relevant and, what is more important, model independent feature of cosmic strings is that they are one dimensional objects with diameter of the order of Planckian size of 10 33 cm. The microscopic charact...

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“…Initially, the object was considered to be a double image lensed by a cosmic string. In 2005 new spectra of CSL-1 were taken with the Very Large Telescope operated by the European Southern Observatory and these observations were consistent with gravitational lensing by a cosmic string [71]. However, further observations with the Hubble space telescope showed that CSL-1 is a pair of very peculiar interacting elliptical galaxies [72,73].…”

Section: Lensing With Cosmic Stringsmentioning

confidence: 94%

Lensing by exotic objects

Zakharov

2010

Gen Relativ Gravit

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Many exotic astronomical objects have been introduced. Usually the objects have masses, therefore they may act as gravitational lenses. We briefly discuss gravitational lensing with cosmic strings. As is well-known, dark matter is one of the most important components of the Universe. Recent computer simulations indicate that dark matter may form clumps. We review gravitational lensing (including microlensing) for the clumps.Keywords Gravitational lensing · Microlensing techniques (astronomy) · Gravitational lenses and luminous arcs · Dark matter Exotic objectsAt the beginning of this article it is necessary to clarify our understanding of exotic objects. This is important because we want to distinguish between objects that are "not exotic", "exotic" and "too exotic". We think that objects are not exotic if there are theoretical plus solid observational arguments for their existence. Objects are exotic if we have indirect evidence and solid theoretical arguments for their possible existence.

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Further Spectroscopic Observations of the CSL 1 Object

Cited by 36 publications

References 18 publications

Exact wave propagation in a spacetime with a cosmic string

Exact wave propagation in a spacetime with a cosmic string

Gravitational Lens Images Generated by Cosmic Strings

Lensing by exotic objects

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