C. de Clercq

activity

19982026

most citedSearch for the Standard Model Higgs boson at LEP in the year 2000

79 citations · 567 across the 32 of their papers we have counts for

collaborators

35 papers

math.AG2026

$R$ -trivial Galois cohomology classes and cohomological $p$ -dimension

Charles De Clercq

Given a prime $p$ , a field $F$ of characteristic different from $p$ and a finite $p$ -primary Galois module $V$ , a Galois cohomology class in $H^{n} (F, V)$ is called $R$ -trivial if it…

math.AG2026

Isotropic localizations of mixed initial motives

Charles De Clercq, Fabio Tanania

In this paper, we define the triangulated category of initial motives, which contains, for example, all motives of projective homogeneous varieties for semisimple algebraic groups…

math.AG2026

Effective Bialynicki-Birula-Brosnan motivic decompositions

Charles De Clercq

Let $G$ be an isotropic reductive group and $X$ be a projective $G$ -homogeneous variety. Using results from Bialynicki-Birula, Hesselink and Iversen, Brosnan showed that if $G$ is…

math.AG2024

A-upper motives of reductive groups

Charles De Clercq, Nikita Karpenko, Anne Quéguiner-Mathieu

Given a prime number $p$ , we perform the study of Chow motives and motivic decompositions, with coefficients in $Z / p Z$ , of projective homogeneous varieties for $p…

math.AG2023

Higher Tate traces of Chow motives

Charles De Clercq, Anne Quéguiner-Mathieu

We establish the complete classification of Chow motives of projective homogeneous varieties for $p$ -inner semi-simple algebraic groups, with coefficients in $\mathbb{Z}/p\mathbb{Z…

math.AG2020

Smooth profinite groups, III: the Smoothness Theorem

Charles De Clercq, Mathieu Florence

Let $p$ be a prime. In this article, we prove the Smoothness Theorem, which asserts that a $(1, 1)$ -cyclotomic pair is $(n, 1)$ -cyclotomic, for all $n \geq 1$ . In the particular case…

math.AG2020

Smooth profinite groups, I: geometrizing Kummer theory

Charles De Clercq, Mathieu Florence

In this series of three papers, we introduce and study cyclotomic pairs and smooth profinite groups. They are a geometric axiomatisation of Kummer theory for fields, with coefficie…

math.AG2018

Lifting low-dimensional local systems

Charles De Clercq, Mathieu Florence

Let $k$ be a field of characteristic $p > 0$ . Denote by $W_{r} (k)$ the ring of truntacted Witt vectors of length $r \geq 2$ , built out of $k$ . In this text, we consider the following q…

math.AG2018

Lifting vector bundles to Witt vector bundles

Charles De Clercq, Mathieu Florence, Giancarlo Lucchini Arteche

Let $X$ be a scheme. Let $r \geq 2$ be an integer. Denote by $W_{r} (X)$ the scheme of Witt vectors of length $r$ , built out of $X$ . We are concerned with the question of extending (=…

math.AG2015★ 7 cited

On the Tits p-indexes of semisimple algebraic groups

Charles De Clercq, Skip Garibaldi

The first author has recently shown that semisimple algebraic groups are classified up to motivic equivalence by the local versions of the classical Tits indexes over field extensi…

math.AG2011★ 1 cited

Upper motives of products of projective linear groups

Charles De Clercq

Fix a base field F, a finite field K and consider a sequence of central simple F-algebras A_1,...,A_n. In this note we provide some results toward a classification of the indecompo…

math.AG2011★ 1 cited

Motivic rigidity of Severi-Brauer varieties

Charles De Clercq

Let D be a central division algebra over a field F. We study in this note the rigidity of the motivic decompositions of the Severi-Brauer varieties of D, with respect to the ring o…

hep-ex2010★ 42 cited

Study of the Dependence of Direct Soft Photon Production on the Jet Characteristics in Hadronic Z^0 Decays

DELPHI Collaboration, J. Abdallah

An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at L…

math.AG2010

Motivic decompositions of projective homogeneous varieties and change of coefficients

Charles De Clercq

We prove that under some assumptions on an algebraic group $G$ , indecomposable direct summands of the motive of a projective $G$ -homogeneous variety with coefficients in $\mathbb{F…

hep-ex2010★ 26 cited

Measurements of CP-conserving Trilinear Gauge Boson Couplings WWV (V = gamma,Z) in e+e- Collisions at LEP2

The DELPHI Collaboration, J. Abdallah

The data taken by DELPHI at centre-of-mass energies between 189 and 209 GeV are used to place limits on the CP-conserving trilinear gauge boson couplings Delta_g1z, lambda_gamma an…

math.AG2010

A going down theorem for Grothendieck Chow motives

Charles De Clercq

Let X be a geometrically split, geometrically irreducible variety over a field F satisfying Rost nilpotence principle. Consider a field extension E/F and a finite field K. We provi…

hep-ex2004★ 50 cited

Search for single top production via FCNC at LEP at sqrt(s) = 189-208 GeV

The DELPHI Collaboration, J. Abdallah

A search for single top production (e+e- -> t cbar) via Flavour Changing Neutral Currents (FCNC) was performed using the data taken by the DELPHI detector at LEP2. The data analyse…

hep-ex2004★ 8 cited

Search for B0_s - anti-B0_s oscillations in DELPHI using high-p_t leptons

The DELPHI Collaboration, J. Abdallah

Oscillations in the B0_s - anti-B0_s system were studied in events selected from about 4.3 million hadronic Z^0 decays registered by DELPHI between 1992 and 2000. This paper presen…

hep-ex2001★ 27 cited