Scientific Commons: L. Covi

For gravitino dark matter with conserved R-parity and mass in the GeV range, very strong constraints from Big Bang Nucleosynthesis exclude the popular NLSP candidates like neutralino and charged...

Gravitino Dark Matter in R-Parity Breaking Vacua. (2007)

W. Buchmuller, DESY Forschung Hochenergiephysik, L. Covi, K. Hamaguchi, A. Ibarra, T. Yanagida

Journal article

New Constraints on Oscillations in the Primordial Spectrum of Inflationary Perturbations. (2007)

J. Hamann, DESY Forschung Hochenergiephysik, L. Covi, A. Melchiorri, A. Slosar

Journal article

Collider Signatures of Gravitino Dark Matter with a sneutrino NLSP. (2007)

L. Covi, DESY Forschung Hochenergiephysik, S. Kraml

Journal article

Gamma-Rays from Decaying Dark Matter. (2007)

G. Bertone, DESY Forschung Hochenergiephysik, W. Buchmüller, L. Covi, A. Ibarra

Journal article

CP Violation and Neutrino Masses and Mixings from Quark Mass Hierarchies. (2007)

W. Buchmuller, DESY Forschung Hochenergiephysik, L. Covi, D. Emmanuel-Costa, S. Wiesenfeldt

Journal article

Dark Matter from Gaugino Mediation. (2006)

W. Buchmüller, DESY Forschung Hochenergiephysik, L. Covi, J. Kersten, K. Schmidt-Hoberg

Journal article

Axinos as Cold Dark Matter. 2006-06-20 - 2006-06-24 (2006)

L. Covi, DESY Forschung Hochenergiephysik

Contribution to a conf. proceeding (book/online)

Axinos as Cold Dark Matter. 2006-06-20 - 2006-06-24 (2006)

L. Covi, DESY Forschung Hochenergiephysik

Contribution to a conf. proceeding (book/online)

Inflation and WMAP Three Year Data: Features have a Future! (2006)

L. Covi, DESY Forschung Hochenergiephysik, J. Hamann, A. Melchiorri, A. Slosar, I. Sorbera

Journal article

False vacuum decay with a U(1) gauge Symmetry (2005)

Covi, L, Hamann, J, Janutta, B

Proton Decay in a 6D SO(10) model (2005)

Covi, L

We present a study of proton decay in a supersymmetric $ SO(10)$ gauge theory in six dimensions compactified on an orbifold. The dimension 5 proton decay operators are absent, but the dimension 6 are...

Proton Decay in a 6D SO(10) model (2005)

Covi, L

We present a study of proton decay in a supersymmetric $ SO(10)$ gauge theory in six dimensions compactified on an orbifold. The dimension 5 proton decay operators are absent, but the dimension 6 are...

Signatures of Axinos and Gravitinos at Colliders (2005)

Brandenburg, A, Covi, L, Hamaguchi, K, Roszkowski, L, Steffen, F D

The axino and the gravitino are well-motivated candidates for the lightest supersymmetric particle (LSP) and also for cold dark matter in the Universe. Assuming that a charged slepton is the...

Signatures of Axinos and Gravitinos at Colliders (2005)

Brandenburg, A, Covi, L, Hamaguchi, K, Roszkowski, L, Steffen, F D

The axino and the gravitino are well-motivated candidates for the lightest supersymmetric particle (LSP) and also for cold dark matter in the Universe. Assuming that a charged slepton is the...

Signatures of Axinos and Gravitinos at Colliders (2005)

Brandenburg, A., Covi, L., Hamaguchi, K., Roszkowski, L., Steffen, F. D.

The axino and the gravitino are well-motivated candidates for the lightest supersymmetric particle (LSP) and also for cold dark matter in the Universe. Assuming that a charged slepton is the...

The running-mass inflation model and WMAP (2004)

Covi, L, Lyth, D H, Melchiorri, A, Odman, C J

We consider the observational constraints on the running-mass inflationary model, and in particular on the scale-dependence of the spectral index, from the new Cosmic Microwave Background (CMB)...

Flavour structure and proton decay in 6D orbifold GUTs (2004)

Buchmüller, Wilfried, Covi, L, Emmanuel-Costa, D, Wiesenfeldt, S

We study proton decay in a supersymmetric {\sf SO(10)} gauge theory in six dimensions compactified on an orbifold. The dimension-5 proton decay operators are forbidden by R-symmetry, whereas the...

Flavour structure and proton decay in 6D orbifold GUTs (2004)

Buchmuller, W., Covi, L., Emmanuel-Costa, D., Wiesenfeldt, S.

We study proton decay in a supersymmetric {\sf SO(10)} gauge theory in six dimensions compactified on an orbifold. The dimension-5 proton decay operators are forbidden by R-symmetry, whereas the...

Quarks and Leptons between Branes and Bulk (2003)

Asaka, T., Buchmuller, W., Covi, L.

We study a supersymmetric SO(10) gauge theory in six dimensions compactified on an orbifold. Three sequential quark-lepton families are localized at the three fixpoints where SO(10) is broken to its...

Bulk and brane anomalies in six dimensions (2002)

Asaka, T., Buchmüller, W., Covi, L.

We study anomalies of six-dimensional gauge theories compactified on orbifolds. In addition to the known bulk anomalies, brane anomalies appear on orbifold fixpoints in the case of chiral boundary...

Exceptional Coset Spaces and Unification in Six Dimensions (2002)

Asaka, T., Buchmüller, W., Covi, L.

The coset spaces E$_8$/SO(10)$\times$H$_F$ allow complex structures which can account for three quark-lepton generations including right-handed neutrinos. We show that in the context of...

What we can learn on inflation from recent CMBR data (2001)

Covi, L

We review the prediction of inflation and the constraints on inflationary models coming from recent observations.

What we can learn on inflation from recent CMBR data (2001)

Covi, L

We review the prediction of inflation and the constraints on inflationary models coming from recent observations.

Gauge Unification In Six Dimensions (2001)

Asaka, T., Buchmüller, W., Covi, L.

We study the breaking of a supersymmetric SO(10) GUT in 6 dimensions by orbifold compactification. In 4 dimensions we obtain a N=1 supersymmetric theory with the standard model gauge group enlarged...

False Vacuum Decay after Inflation (2001)

Asaka, T., Buchmuller, W., Covi, L.

Inflation is terminated by a non-equilibrium process which finally leads to a thermal state. We study the onset of this transition in a class of hybrid inflation models. The exponential growth of...

Axinos as Dark Matter (2001)

Covi, L, Kim, H B, Kim, J E, Roszkowski, Leszek

Supersymmetric extensions of the Standard Model which incorporate the axion solution to the strong CP problem necessarily contain also the axino, the fermionic partner of the axion. In contrast to...

Global fits for the spectral index of the cosmological curvature perturbation (2000)

Covi, L., Lyth, D. H.

Best-fit values of the spectral index of the curvature perturbation are presented, assuming the $\Lambda$CDM cosmology. Apart from the spectral index, the parameters are the Hubble parameter, the...

Hybrid Inflation from Supersymmetric SU(5) (1997)

Covi, L., Mangano, G., Masiero, A., Miele, G.

A scheme of hybrid inflation is considered in the framework of the minimal supersymmetric SU(5) model with an extra singlet. The relevant role of the cubic term in the adjoint representation in the...

Baryogenesis from mixed particle decays (1996)

Covi, L., Roulet, E.

We consider the $CP$ violating asymmetries produced in the decay of heavy particles, studying the effects of heavy particle mixing for arbitrary mass splittings. A considerable enhancement of the...

CP violating decays in leptogenesis scenarios (1996)

Covi, L., Roulet, E., Vissani, F.

We compute the CP violation in the decays of heavy electroweak singlet neutrinos, arising from both the one--loop vertex corrections and the wave function mixing. We extend the computation to the...

Axinos as Dark Matter. 2006-05-29 - 2006-06-01

L. Covi, DESY Forschung Hochenergiephysik

Conference presentation

Axinos as Dark Matter. 2006-02-09 - 2006-02-09

L. Covi, DESY Forschung Hochenergiephysik, Seminar Brussels Belgium

Conference presentation

Axinos as Dark Matter. 2006-03-28 - 2006-03-28

L. Covi, DESY Forschung Hochenergiephysik, Seminar Madrid Spain

Conference presentation

Constraining Inflationary Models with WMAP and Large Scale Structure Data. 2006-05-16 - 2006-05-16

L. Covi, DESY Forschung Hochenergiephysik, Seminar Dortmund Germany

Conference presentation