Nonlocal dynamics in string field theory and cosmological applications
Download
1 / 51

Nonlocal Dynamics in String Field Theory and cosmological applications - PowerPoint PPT Presentation


  • 65 Views
  • Uploaded on
  • Presentation posted in: General

Nonlocal Dynamics in String Field Theory and cosmological applications. Liudmila Joukovskaya, CTC, DAMTP, University of Cambridge. 21 January, Imperial College London. Plan of the talk. General Motivations Construction of rolling solutions in the truncated SFT

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha

Download Presentation

Nonlocal Dynamics in String Field Theory and cosmological applications

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Nonlocal dynamics in string field theory and cosmological applications
Nonlocal Dynamics in String Field Theory and cosmological applications

Liudmila Joukovskaya,

CTC, DAMTP, University of Cambridge

21 January, Imperial College London


Plan of the talk
Plan of the talk applications

  • General Motivations

  • Construction of rolling solutions in the truncated SFT

    a) Truncated SFT (nonlocality)

    b) Space homogeneous rolling solutions

  • Cosmological motivations for nonlocal theories

  • SFT as a possible framework for cosmology

  • Rolling cosmological solutions


Motivations
Motivations applications

  • Cosmological Motivations

  • Theoretical Motivations

  • String Field Theory as a possible framework for Cosmology


Nonlocal dynamics in string field theory and cosmological applications

Witten’s Cubic Open String Field Theory applications

E. Witten, Nucl. Phys. B 268 (1986) 253

V.A. Kostelecky, S.Samuel,

Phys. Lett. B 207 (1988) 169

V.A. Kostelecky,S.Samuel, Phys. Lett. B 207 (1988) 169,

P.West, Phys.Lett.B548:92-96,2002

N. Moeller, A. Sen, B. Zwiebach, JHEP, 08 (2000) 039

Cubic Fermionic String Field Theory

I.Aref’eva, P.Medvedev, A.Zubarev

Phys.Lett.B240 (1990)356

C.Preitschopf, C.Thorn, S.Yost,

Nucl. Phys. B337 (1990) 363

I.Arefeva, D.Belov, A.Koshelev,

P.Medvedev, Nucl.Phys.B638 (2002)3



Nonlocal dynamics in string field theory and cosmological applications

Level truncation action

Covariant String Field Theory



Stress tensor
Stress Tensor action

N. Moeller, B. Zwiebach, JHEP, 10 (2002) 034

H. Yang, JHEP 11 (2002) 007

I. Aref’eva, L.J., A. Koshelev, JHEP, 09 (2003) 012



Solution construction for minkowski case
Solution construction for Minkowski case action

Ya. Volovich, JPA, 2003; Ya. Volovich, V.S. Vladimirov, Theor. Math. Phys. 2004;

L.J., Theor. Math. Phys. 2006 or arxiv: 0708.0642[hep-th];

V.S. Vladimirov, arxiv: 0705.4600

D. V. Prokhorenko, math-ph/0611068; G. Calcagni, G. Nardelli, arxiv: 0708.0366



Nonlocal dynamics in string field theory and cosmological applications

Standard Cosmological Concordance Model is emerging action

during the last 10 years …


Big bang inflationary cosmology
Big Bang/Inflationary Cosmology action

Picture taken from:cosmology.berkeley.edu


Cyclic ekpyrotic cosmology
Cyclic/Ekpyrotic Cosmology action

N. Turok, P.J. Steinhardt,

J. Khoury, B. Ovrut


Nonlocal dynamics in string field theory and cosmological applications

A great discovery of the last few years is the discovery actionof the current accelerated expansion of the Universe

Observations (1998) of very distant supernovae demonstrated that the Universe is expanding with an acceleration. Ia Supernovae: S.Perlmutter et al., A.Riess et al., 1998;

This acceleration seems to be explicable by the presence of a new component of matter called dark energy (DE).

DE is a special unknown form of matter with negative pressure and it provides universal repulsive forces (antigravity).


Nonlocal dynamics in string field theory and cosmological applications

Picture taken from: http:// actionmap.gsfc.nasa.gov



Nonlocal dynamics in string field theory and cosmological applications

Standard Cosmological Concordance Model is emerging action

during the last 10 years…

String Field Theory as a possible cosmological framework


Non locality and cosmology
Non-locality and Cosmology action

  • Non-local gravity ad-hoc:

Arkani-Hamed at al hep-th/0209227;

Khoury, hep-th/0612052;

T.Biswas, A.Mazumdar, W.Siegel, hep-th/0508194,

G.Dvali, S. Hofmann, JKhoury,hep-th/0703027

S.Deser, R.Woodard, arXiv:0706.2151S.

  • Non-local SFT:

I.Aref’eva, LJ, A.Koshelev, JHEP, 2003;

I.Aref’eva, LJ, JHEP, 2005

G.Calcagni, JHEP, 2005

LJ, PRD 2007

G. Calcagni, M.Montobbio, G.Nardelli; PRD 2007

N. Barnaby, T. Biswas, J.M. Cline, JHEP 2007

J.Lidsey, PRD 2007;

D. Mulryne, N. Nunes, PRD 2008


Nonlocal dynamics in string field theory and cosmological applications

Einstein equations action

FriedmannCosmology

+ Cosmological principle

Isotropic

Homogeneous

K=+1 (3-sphere), k=0 (plane), k=-1 (3-hyperboloid)













Numerical solutions
Numerical solutions potential?

a.

b.



Main results presented in this talk
Main results presented in this talk: potential?

  • Construction of rolling cosmological solutions for:

  • Tachyon field describing non-BPS branes

    in Friedmann-Robertson-Walker background

    (Does exist in Minkowski case AJK)

  • Tachyon field of open bosonic string

    in Friedmann-Robertson-Walker background

    (Does not exist in the Minkowski case (Moeller, Zwiebach) )




ad
  • Login