An inverse theorem for the Gowers U^{s+1}[N]-norm

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2011, 18: 69-90. doi: 10.3934/era.2011.18.69

An inverse theorem for the Gowers $U^{s+1}[N]$-norm

Ben Green ^1, , Terence Tao ^2, and Tamar Ziegler ^3,

1.	Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA
2.	Department of Mathematics, UCLA, 405 Hilgard Ave, Los Angeles, CA 90095
3.	Department of Mathematics, Technion - Israel Institute of Technology, Haifa, 32000, Israel

Received March 2011 Revised May 2011 Published July 2011

Abstract
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Under a Creative Commons license

This is an announcement of the proof of the inverse conjecture for the Gowers $U^{s+1}[N]$-norm for all $s \geq 3$; this is new for $s \geq 4$, the cases $s = 1,2,3$ having been previously established. More precisely we outline a proof that if $f : [N] \rightarrow [-1,1]$ is a function with ||$f$|| $U^{s+1}[N] \geq \delta$ then there is a bounded-complexity $s$-step nilsequence $F(g(n)\Gamma)$ which correlates with $f$, where the bounds on the complexity and correlation depend only on $s$ and $\delta$. From previous results, this conjecture implies the Hardy-Littlewood prime tuples conjecture for any linear system of finite complexity. In particular, one obtains an asymptotic formula for the number of $k$-term arithmetic progressions $p_1 < p_2 < ... < p_k \leq N$ of primes, for every $k \geq 3$.

Keywords: Gowers norms, nilsequences..

Mathematics Subject Classification: Primary: 11B9.

Citation: Ben Green, Terence Tao, Tamar Ziegler. An inverse theorem for the Gowers $U^{s+1}[N]$-norm. Electronic Research Announcements, 2011, 18: 69-90. doi: 10.3934/era.2011.18.69

References:

[1]	N. Alon, T. Kaufman, M. Krivelevich, S. Litsyn and D. Ron, Testing low-degree polynomials over GF(2), Approximation, Randomization, and Combinatorial Optimization, 2003, 188-199. Also: Testing Reed-Muller codes, IEEE Transactions on Information Theory, 51 (2005), 4032-4039. doi: 10.1109/TIT.2005.856958.
[2]	A. Balog and E. Szemerédi, A statistical theorem of set addition, Combinatorica, 14 (1994), 263-268. doi: 10.1007/BF01212974.
[3]	V. Bergelson, B. Host and B. Kra, Multiple recurrence and nilsequences, (with an appendix by I. Ruzsa), Invent. Math., 160 (2005), 261-303. doi: 10.1007/s00222-004-0428-6.
[4]	V. Bergelson, T. Tao and T. Ziegler, An inverse theorem for uniformity seminorms associated with the action of $F_p^{\infty}$, Geom. Funct. Anal., 19 (2010), 1539-1596. doi: 10.1007/s00039-010-0051-1.
[5]	J.-P. Conze and E. Lesigne, Sur un théorème ergodique pour des mesures diagonales, (French) [On an ergodic theorem for diagonal measures], C. R. Acad. Sci. Paris Sér. I Math., 306 (1988), 491-493.
[6]	N. Frantzikinakis, B. Host and B. Kra, Multiple recurrence and convergence for sequences related to the prime numbers, J. Reine Angew. Math., 611 (2007), 131-144. doi: 10.1515/CRELLE.2007.076.
[7]	G. A. Freĭman, "Foundations of a Structural Theory of Set Addition," Translations of Mathematical Monographs, 37, AMS, Providence, RI, 1973.
[8]	H. Furstenberg, "Nonconventional Ergodic Averages," The legacy of John von Neumann (Hempstead, NY, 1988), 43-56, Proc. Sympos. Pure Math., 50, Amer. Math. Soc., Providence, RI, 1990.
[9]	H. Furstenberg and B. Weiss, "A mean ergodic theorem for $1/N\sum^N_{n=1}f (T^n x)g(T^ {n^ 2}x)$," Convergence in ergodic theory and probability (Columbus, OH, 1993), 193-227, Ohio State Univ. Math. Res. Inst. Publ., 5 de Gruyter, Berlin, 1996.
[10]	W. T. Gowers, A new proof of Szemerédi's theorem for progressions of length four, GAFA, 8 (1998), 529-551. doi: 10.1007/s000390050065.
[11]	-, A new proof of Szemerédi's theorem, GAFA, 11 (2001), 465-588.
[12]	B. Green, "Generalising the Hardy-Littlewood Method for Primes," International Congress of Mathematicians. Vol. II, 373-399, Eur. Math. Soc., Zürich, 2006.
[13]	B. Green and T. Tao, The primes contain arbitrarily long arithmetic progressions, Annals of Math. (2), 167 (2008), 481-547. doi: 10.4007/annals.2008.167.481.
[14]	-, An inverse theorem for the Gowers $U^3$-norm, with applications, Proc. Edinburgh Math. Soc., 51, 71-153.
[15]	-, Linear equations in primes, Ann. Math. (2), 171 (2010), 1753-1850.
[16]	-, The quantitative behaviour of polynomial orbits on nilmanifolds, to appear in Ann. Math.
[17]	-, The Möbius function is strongly orthogonal to nilsequences, to appear in Ann. Math.
[18]	-, An arithmetic regularity lemma, associated counting lemma, and applications, in "An Irregular Mind" (Szemerédi is 70), Bolyai Society Mathematical Studies, 21, 261-334.
[19]	B. Green, T. Tao and T. Ziegler, An inverse theorem for the Gowers $U^4[N]$-norm, Glasgow Math. J., 53 (2011), 1-50. doi: 10.1017/S0017089510000546.
[20]	-, An inverse theorem for the Gowers $U^{s+1}[N]$ norm, preprint, arXiv:1009.3998.
[21]	I. J. Håland, Uniform distribution of generalized polynomials, J. Number Theory, 45 (1993), 327-366. doi: 10.1006/jnth.1993.1082.
[22]	B. Host and B. Kra, Convergence of Conze-Lesigne averages, Erg. Th. Dyn. Sys., 21 (2001), 493-509.
[23]	-, Averaging along cubes, Modern Dynamical Systems and Applications, Cambridge University Press, Cambridge, (2004), 123-144.
[24]	-, Nonconventional ergodic averages and nilmanifolds, Ann. of Math. (2), 161 (2005), 397-488.
[25]	-, Uniformity seminorms on $l^\infty$ and applications, J. Anal. Math., 108 (2009), 219-276. doi: 10.1007/s11854-009-0024-1.
[26]	A. Leibman, Pointwise convergence of ergodic averages of polynomial sequences of translations on a nilmanifold, Ergodic Theory and Dynamical Systems, 25 (2005), 201-213. doi: 10.1017/S0143385704000215.
[27]	-, A canonical form and the distribution of values of generalized polynomials, to appear in Israel Journal of Mathematics.
[28]	E. Lesigne, Équations fonctionnelles, couplages de produits gauches et théorèmes ergodiques pour mesures diagonales, (French) [Functional equations, couplings of skew products, ergodic theorems for diagonal measures], Bull. Soc. Math. France, 121 (1993), 315-351.
[29]	I. Z. Ruzsa, Generalized arithmetical progressions and sumsets, Acta Math. Hungar., 65 (1994), 379-388. doi: 10.1007/BF01876039.
[30]	A. Samorodnitsky, "Low-Degree Tests at Large Distances," STOC'07, Proceedings of the 39th Annual ACM Symposium on Theory of Computing, ACM, New York, (2007), 506-515.
[31]	B. Szegedy, Higher order Fourier analysis as an algebraic theory I, preprint, arXiv::0903.0897.
[32]	-, Higher order Fourier analysis as an algebraic theory II, preprint, arXiv::0911.1157.
[33]	-, Higher order Fourier analysis as an algebraic theory III, preprint, arXiv::1001.4282.
[34]	T. Tao and T. Ziegler, The inverse conjecture for the Gowers norms over finite fields via the correspondence principle, Anal. PDE, 3 (2010), 1-20. doi: 10.2140/apde.2010.3.1.
[35]	T. Tao and V. Vu, "Additive Combinatorics," Cambridge Studies in Advanced Mathematics, 105, Cambridge University Press, Cambridge, 2006.
[36]	T. Ziegler, Universal characteristic factors and Furstenberg averages, J. Amer. Math. Soc., 20 (2007), 53-97. doi: 10.1090/S0894-0347-06-00532-7.

show all references

References:

[1]	N. Alon, T. Kaufman, M. Krivelevich, S. Litsyn and D. Ron, Testing low-degree polynomials over GF(2), Approximation, Randomization, and Combinatorial Optimization, 2003, 188-199. Also: Testing Reed-Muller codes, IEEE Transactions on Information Theory, 51 (2005), 4032-4039. doi: 10.1109/TIT.2005.856958.
[2]	A. Balog and E. Szemerédi, A statistical theorem of set addition, Combinatorica, 14 (1994), 263-268. doi: 10.1007/BF01212974.
[3]	V. Bergelson, B. Host and B. Kra, Multiple recurrence and nilsequences, (with an appendix by I. Ruzsa), Invent. Math., 160 (2005), 261-303. doi: 10.1007/s00222-004-0428-6.
[4]	V. Bergelson, T. Tao and T. Ziegler, An inverse theorem for uniformity seminorms associated with the action of $F_p^{\infty}$, Geom. Funct. Anal., 19 (2010), 1539-1596. doi: 10.1007/s00039-010-0051-1.
[5]	J.-P. Conze and E. Lesigne, Sur un théorème ergodique pour des mesures diagonales, (French) [On an ergodic theorem for diagonal measures], C. R. Acad. Sci. Paris Sér. I Math., 306 (1988), 491-493.
[6]	N. Frantzikinakis, B. Host and B. Kra, Multiple recurrence and convergence for sequences related to the prime numbers, J. Reine Angew. Math., 611 (2007), 131-144. doi: 10.1515/CRELLE.2007.076.
[7]	G. A. Freĭman, "Foundations of a Structural Theory of Set Addition," Translations of Mathematical Monographs, 37, AMS, Providence, RI, 1973.
[8]	H. Furstenberg, "Nonconventional Ergodic Averages," The legacy of John von Neumann (Hempstead, NY, 1988), 43-56, Proc. Sympos. Pure Math., 50, Amer. Math. Soc., Providence, RI, 1990.
[9]	H. Furstenberg and B. Weiss, "A mean ergodic theorem for $1/N\sum^N_{n=1}f (T^n x)g(T^ {n^ 2}x)$," Convergence in ergodic theory and probability (Columbus, OH, 1993), 193-227, Ohio State Univ. Math. Res. Inst. Publ., 5 de Gruyter, Berlin, 1996.
[10]	W. T. Gowers, A new proof of Szemerédi's theorem for progressions of length four, GAFA, 8 (1998), 529-551. doi: 10.1007/s000390050065.
[11]	-, A new proof of Szemerédi's theorem, GAFA, 11 (2001), 465-588.
[12]	B. Green, "Generalising the Hardy-Littlewood Method for Primes," International Congress of Mathematicians. Vol. II, 373-399, Eur. Math. Soc., Zürich, 2006.
[13]	B. Green and T. Tao, The primes contain arbitrarily long arithmetic progressions, Annals of Math. (2), 167 (2008), 481-547. doi: 10.4007/annals.2008.167.481.
[14]	-, An inverse theorem for the Gowers $U^3$-norm, with applications, Proc. Edinburgh Math. Soc., 51, 71-153.
[15]	-, Linear equations in primes, Ann. Math. (2), 171 (2010), 1753-1850.
[16]	-, The quantitative behaviour of polynomial orbits on nilmanifolds, to appear in Ann. Math.
[17]	-, The Möbius function is strongly orthogonal to nilsequences, to appear in Ann. Math.
[18]	-, An arithmetic regularity lemma, associated counting lemma, and applications, in "An Irregular Mind" (Szemerédi is 70), Bolyai Society Mathematical Studies, 21, 261-334.
[19]	B. Green, T. Tao and T. Ziegler, An inverse theorem for the Gowers $U^4[N]$-norm, Glasgow Math. J., 53 (2011), 1-50. doi: 10.1017/S0017089510000546.
[20]	-, An inverse theorem for the Gowers $U^{s+1}[N]$ norm, preprint, arXiv:1009.3998.
[21]	I. J. Håland, Uniform distribution of generalized polynomials, J. Number Theory, 45 (1993), 327-366. doi: 10.1006/jnth.1993.1082.
[22]	B. Host and B. Kra, Convergence of Conze-Lesigne averages, Erg. Th. Dyn. Sys., 21 (2001), 493-509.
[23]	-, Averaging along cubes, Modern Dynamical Systems and Applications, Cambridge University Press, Cambridge, (2004), 123-144.
[24]	-, Nonconventional ergodic averages and nilmanifolds, Ann. of Math. (2), 161 (2005), 397-488.
[25]	-, Uniformity seminorms on $l^\infty$ and applications, J. Anal. Math., 108 (2009), 219-276. doi: 10.1007/s11854-009-0024-1.
[26]	A. Leibman, Pointwise convergence of ergodic averages of polynomial sequences of translations on a nilmanifold, Ergodic Theory and Dynamical Systems, 25 (2005), 201-213. doi: 10.1017/S0143385704000215.
[27]	-, A canonical form and the distribution of values of generalized polynomials, to appear in Israel Journal of Mathematics.
[28]	E. Lesigne, Équations fonctionnelles, couplages de produits gauches et théorèmes ergodiques pour mesures diagonales, (French) [Functional equations, couplings of skew products, ergodic theorems for diagonal measures], Bull. Soc. Math. France, 121 (1993), 315-351.
[29]	I. Z. Ruzsa, Generalized arithmetical progressions and sumsets, Acta Math. Hungar., 65 (1994), 379-388. doi: 10.1007/BF01876039.
[30]	A. Samorodnitsky, "Low-Degree Tests at Large Distances," STOC'07, Proceedings of the 39th Annual ACM Symposium on Theory of Computing, ACM, New York, (2007), 506-515.
[31]	B. Szegedy, Higher order Fourier analysis as an algebraic theory I, preprint, arXiv::0903.0897.
[32]	-, Higher order Fourier analysis as an algebraic theory II, preprint, arXiv::0911.1157.
[33]	-, Higher order Fourier analysis as an algebraic theory III, preprint, arXiv::1001.4282.
[34]	T. Tao and T. Ziegler, The inverse conjecture for the Gowers norms over finite fields via the correspondence principle, Anal. PDE, 3 (2010), 1-20. doi: 10.2140/apde.2010.3.1.
[35]	T. Tao and V. Vu, "Additive Combinatorics," Cambridge Studies in Advanced Mathematics, 105, Cambridge University Press, Cambridge, 2006.
[36]	T. Ziegler, Universal characteristic factors and Furstenberg averages, J. Amer. Math. Soc., 20 (2007), 53-97. doi: 10.1090/S0894-0347-06-00532-7.

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