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It is shown that Born-Infeld gravity –a high energy deformation of Einstein gravity– removes
the singularities of a cosmic string. The respective vacuum solution results to be free of conical singula...
Remarks on Higgs Inflation
Remarks Higgs Inflation
2010/12/21
We discuss models where the Higgs boson of the electroweak standard model plays the role of the inflaton. We focus on the question of the violation of perturbative unitarity due to the coupling of the...
Cosmological consequences of Modified Gravity (MOG)
Cosmological consequences Modified Gravity
2010/12/20
As an alternative to the LCDM concordance model, Scalar-Tensor-Vector Modified Gravity (MOG) theory reproduces key cosmological observations without postulating the presence of an exotic dark matter c...
The Fluid/Gravity Correspondence: a new perspective on the Membrane Paradigm
Fluid/Gravity Correspondence new perspective Membrane Paradigm
2010/12/20
Relations between kinematics, geometry and law of reference frame motion are considered. We show, that kinematical tensors define geometry up to a space functional arbitrariness when integrability con...
Complementarity of Kinematics and Geometry in General Relativity Theory
Complementarity of Kinematics Geometry General Relativity Theory
2010/12/20
Relations between kinematics, geometry and law of reference frame motion are considered. We show, that kinematical tensors define geometry up to a space functiona arbitrariness when integrability cond...
Warm DBI Inflation
Warm DBI Inflation
2010/12/21
We propose a warm inflationary model in the context of relativistic D-brane inflation in a warped throat. The inflaton has Dirac-Born-Infeld (DBI) kinetic term and is coupled to radiation through a di...
Constraints for the QCD phase diagram from imaginary chemical potential
Constraints QCD phase diagram imaginary chemical potential
2011/1/13
We present unambiguous evidence from lattice simulations of Nf = 3 QCD for two tricritical
points in the (T,m) phase diagram at fixed imaginary m/T = ip /3 mod. 2p /3, one in the light
and one in th...
Mutated hybrid inflation in $f(R,{\Box}R)$-gravity
Mutated hybrid inflation $f(R,{\Box}R)$-gravity
2010/12/21
A new hybrid inflationary scenario in the context of f(R,R)-gravity is proposed. Demanding
the waterfall field to ‘support the potential from below’ [unlike the original proposal by Stewart in Phys....
The sphaleron rate is defined as the diffusion constant for topological number NCS ≡ R g2F ˜ F 322 .It establishes the rate of equilibration of axial light quark number in QCD and is of interest...
Weak lensing and the Dyer-Roeder approximation
gravitational lensing weak – cosmology theory – large-scale structure of Universe
2010/12/21
The distance-redshift relation plays an important role in cosmology. In the standard approach to cosmology it is assumed that this relation is the same as in the homo-geneous universe.
Emergent gravitational dynamics from multi-BEC hydrodynamics?
Emergent gravitational dynamics multi-BEC hydrodynamics
2010/12/20
In this paper, we examine the possibility to implement some form of emergent Newtonian gravity
in a generic multi-component Bose–Einstein condensate. Parallely to what happens for the emer-
gence of...
A Characteristic Extraction Tool for Gravitational Waveforms
Characteristic Extraction Tool Gravitational Waveforms
2010/12/20
We develop and test a characteristic waveform extraction tool which incorporates major improvements and corrections of prior versions.
Quantum-Gravity Induced Lorentz Violation and Dynamical Mass Generation
Quantum-Gravity Lorentz Violation Dynamical Mass Generation
2010/12/21
In Ref. [1] a minimal extension of (3+1)-dimensional Quantum Electrodynamics has been proposed, which includes Lorentz-Violation (LV) in the form of higher-(spatial)-derivative isotropic terms in the ...
Observational constraints on Chaplygin cosmology in a braneworld scenario with induced gravity and curvature effect
Cosmology Dark energy -Cosmology theory- Cosmology Observations
2010/12/21
We study cosmological dynamics and late-time evolution of an extended induced grav-ity braneworld scenario. In this scenario, curvature effects are taken into account via the
Gauss-Bonnet term in the...
How the Quark Number fluctuates in QCD at small chemical potential
Quark Number fluctuates QCD small chemical potential
2011/1/14
We discuss the distribution of the quark number over the gauge fields for QCD at nonzero quark
chemical potential. As the quark number operator is non-hermitian, the distribution is over the
complex...