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II SUMMER SCHOOL IN MODERN MATHEMATICAL PHYSICS September 1-12, 2002 Kopaonik, (SERBIA) YUGOSLAVIA

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##### II SUMMER SCHOOL IN MODERN MATHEMATICAL PHYSICS September 1-12, 2002 Kopaonik, (SERBIA) YUGOSLAVIA

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**I.Ya. Aref'eva**Steklov Mathematical Institute Super String Field Theory and Vacuum Super String Field Theory II SUMMER SCHOOL INMODERN MATHEMATICAL PHYSICSSeptember 1-12, 2002Kopaonik, (SERBIA) YUGOSLAVIA**Why**String Field Theory? main motivations: gauge invariance principle behind string interactions non-perturbative phenomena • What we can calculate in String Field Theory? (analog of Higgs and Goldstone Phenomena) Condensation of Tachyon Brane tensions Rolling Tachyon • How we can do calculations in SFT? String Field Theory and Noncommutative Geometry String Field Theory and CFT**Local space-time fields**String Field Theory Second Quantized String Theory • Infinite number of local fields • String FieldA[X(σ)] - functional, or state inFockspace • Ghosts A[X(σ), c(σ), b (σ)] • Example:**Pointwise multiplication of functions**Multiplication of matrices Moyal product INTERACTION ? Associative Product of String Fields Examples of associative multiplications:**Witten’s String Product**Associative Product of String Fields -- Coordinate representation**A - string field**- BRST charge, derivation of the star algebra - inner product - associative non-commutative product - open string coupling constant SFT Action E.Witten (1986) Gaugetransformations:**Tachyon Condensation in SFT**• Bosonic String - Tachyon Kostelecky,Samuel (1989)**SFT**Sen’s conjecture (1999) Vacuum Energy = Brane Tension Strings Branes**=**NO OPEN STRING EXCITATIONS CLOSED STRING EXCITATIONS Sen’s conjectures (1999)**RollingTachyon**Motivations:cosmology,... • Anharmonic oscillator • alpha’ corrections • p-adic strings I.Volovich(1987); P.Frampton, Nishino(1988); Brekke,Freund,Witten(1988), I.A,B.Dragovic,I.Volovich(1988) Moeller, Zwiebach, hep-th/0207107 p-adic and NC space-time I.A.,I.Volovich, 1990 • SFT Sen, Strings2002 I.A, A.Giryavets, A.Koshelev**RollingTachyon**Spatially homogeneous field configurations: E.O.M. where**RollingTachyon**Anharmonic oscillator approximation E.O.M.**If**resonance i.e. Anharmonic oscillator**Two regimes:**Rolling Tachyon Initial condition near the top Initial condition near the bottom**Rolling Tachyon (bosonic case)**Initial condition near the top Initial condition near the bottom**Alpha ‘ corrections (boson case)**• First order Solutions**RollingTachyon**E.O.M.**RollingTachyon**E.O.M. X-dependence**RollingTachyon**E.O.M. Two analogues: i) p-adic strings ii) non-commutative solitons in strong coupling regime Gopakumar, Minwalla,Strominger**RollingTachyon**Time evolution in the «sliver-tachyon» and p-adic strings p=2,3,5,.. (*) There is no solution such that with BUT this contradiction does not take place for (*) decreasing monotonically in time**--**+ + … Solutions to SFT E.O.M. Analog of Yang-Feldman eq. Resonance = Sen Problems!!!**OUTLOOK**String Field Theory L.Bonora Noncommutative Field Theories and (Super) String Field Theories,hep-th/0111208, I.A., D. Belov, A.Giryavets, A.Koshelev,P.Medvedev SuperString Field Theory • Cubic SSFT action 2-nd • Tachyon Condensation in SSFT • RollingTachyon 3-d • Vacuum SuperString Field Theory i)New BRST charge ii) Special solutions - sliver, lump, etc.: algebraic; surface states; Moyal representation