A new cosmological scenario in string theory

Cornalba, Lorenzo; Costa, Miguel S.

doi:10.1103/physrevd.66.066001

Cited by 275 publications

(409 citation statements)

References 42 publications

(74 reference statements)

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“…It was shown in [14] that a Cardy-like formula for field theories with Galilean conformal symmetry in two dimensions (resulting from time-contraction of two dimensional CFT on the cylinder) produces the same entropy as that of three-dimensional cosmological solutions of flat gravity. These solutions of Einstein gravity in three dimensions were first studied in [15] and are shiftboost orbifolds of three dimensional Minkowski spacetime. They can be viewed as the large radius limit of non-extremal BTZ black holes in AdS 3 .…”

Section: Jhep03(2014)005mentioning

confidence: 99%

Flat-space energy-momentum tensor from BMS/GCA correspondence

Fareghbal

Naseh

2014

J. High Energ. Phys.

100

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Flat-space limit is well-defined for asymptotically AdS spacetimes written in coordinates called the BMS gauge. For the three-dimensional Einstein gravity with a negative cosmological constant, we calculate the quasi-local energy momentum tensor in the BMS gauge and take its flat-space limit. In defining the flat-space limit, we use the BMS/GCA correspondence which is a duality between gravity in flat-spacetime and a field theory with Galilean conformal symmetry. The resulting stress tensor reproduces correct values for conserved charges of three dimensional asymptotically flat solutions. We show that the conservation relation of the flat-space energy-momentum tensor is given by an ultra-relativistic contraction of its relativistic counterpart. The conservation equations correspond to Einstein equation for the flat metric written in the BMS gauge. Our results provide further checks for the proposal that the holographic dual of asymptotically flat spacetimes is a field theory with Galilean conformal symmetry.

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Section: Jhep03(2014)005mentioning

confidence: 99%

Flat-space energy-momentum tensor from BMS/GCA correspondence

Fareghbal

Naseh

2014

J. High Energ. Phys.

100

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“…Following earlier work [5][6][7][8][9][10][11][12][13][14][15] on related models, we study here a simple model of a cosmological singularity, known as the Misner (or Milne) Universe [16]. Being the orbifold of flat Minkowski space R 1,1 by a discrete boost, the world-sheet theory is in principle solvable by standard conformal field theory techniques.…”

Section: Introductionmentioning

confidence: 99%

Closed strings in Misner space: cosmological production of winding strings

Berkooz

Pioline

Rozali

2004

J. Cosmol. Astropart. Phys.

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Misner space, also known as the Lorentzian orbifold R 1,1 /boost, is one of the simplest examples of a cosmological singularity in string theory. In this work, the study of weakly coupled closed strings on this space is pursued in several directions: (i) physical states in the twisted sectors are found to come in two kinds: short strings, which wind along the compact space-like direction in the cosmological (Milne) regions, and long strings, which wind along the compact time-like direction in the (Rindler) whiskers. The latter can be viewed as infinitely long static open strings, stretching from Rindler infinity to a finite radius and folding back onto themselves. (ii) As in the Schwinger effect, tunneling between these states corresponds to local pair production of winding strings. The tunneling rate approaches unity as the winding number w gets large, as a consequence of the singular geometry. (iii) The one-loop string amplitude has singularities on the moduli space, associated to periodic closed string trajectories in Euclidean time. In the untwisted sector, they can be traced to the combined existence of CTCs and Regge trajectories in the spectrum. In the twisted sectors, they indicate pair production of winding strings. (iv) At a classical level and in sufficiently low dimension, the condensation of winding strings can indeed lead to a bounce, although the required initial conditions are not compatible with Misner geometry at early times. (v) The semi-classical analysis of winding string pair creation can be generalized to more general (off-shell) geometries. We show that a regular geometry regularizes the divergence at large winding number. * Incumbent of the Recanati career development chair for energy research

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“…In dS 3 one can create such type of background by a suitable identification of global de Sitter by an element of the isometry group. In this case the identification is obviously singular but this particular type of singularity merited some attention recently [35]. Another, perhaps more amenable, question deals with the entropy of these backgrounds.…”

Section: Whither the Correspondence?mentioning

confidence: 99%

On the hologram of de Sitter

Cunha

2002

Phys. Rev. D

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A careful reduction of the three-dimensional gravity to the Liouville description is performed, where all gauge fixing and on-shell conditions come from the definition of asymptotic de Sitter spaces. The roles of both past and future infinities are discussed and the conditions space-time evolution imposes on both Liouville fields are explicited. Space-times which correspond to non-equivalent profiles of the Liouville field at I − and I + are shown to exist. The qualitative implications of this for any tentative dual theory are presented.

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A new cosmological scenario in string theory

Cited by 275 publications

References 42 publications

Flat-space energy-momentum tensor from BMS/GCA correspondence

Flat-space energy-momentum tensor from BMS/GCA correspondence

Closed strings in Misner space: cosmological production of winding strings

On the hologram of de Sitter

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