scholarly journals Dispersive property of the quantum vacuum and the speed of light

2019 ◽  
Vol 34 (04) ◽  
pp. 1950035 ◽  
Author(s):  
H. Razmi ◽  
N. Baramzadeh ◽  
H. Baramzadeh
Keyword(s):  
Quantum Theory ◽  
Light Propagation ◽  
Vacuum Energy ◽  
Nonlinear Effects ◽  
Zero Point ◽  
Quantum Vacuum ◽  
Electric Permittivity ◽  
Speed Of Light ◽  
Standard Linear ◽  
Linear Quantum

We want to study the influence of the quantum vacuum on light propagation. At first, by working in the standard linear quantum theory of the electromagnetic fields, it is shown that the electric permittivity and the magnetic permeability of the vacuum medium are changed; but, the resulting speed of light is not modified. Then, taking into account nonlinear effects by considering the Euler–Heisenberg Lagrangian, the corresponding zero point (vacuum) energy and the resulting modification of the speed of light are found up to the first nonvanishing correction.

scholarly journals Extreme Properties, variances and the behavior of the Universe

2021 ◽  
Author(s):  
K.H.K. Geerasee Wijesuriya
Keyword(s):  
Vacuum Energy ◽  
Zero Point ◽  
Vacuum State ◽  
Quantum Vacuum ◽  
Point Energy ◽  
Real Nature ◽  
Accelerating Expansion ◽  
Expansion Of The Universe ◽  
Energy Quantum ◽  
The Universe

At this moment, scientists don’t have any significant explanation to explain ‘why there are much matter particles than anti-matter particles’ in the universe. But with this research, it is going to provide an explanation for that.An attempt of this research is to provide detailed innovative arguments regarding the real nature of supermassive black holes also. Here this is intending to explain why, the contribution to the accelerating expansion of the universe by the quantum vacuum is much bit than the contribution by other matters in the universe.Scientists have confused on why the energy of the zero-point energy (quantum vacuum) state, does not contribute to the cosmological vacuum energy (cosmological constant) much. The goal of this research is to investigate a solution to that particular problem also. This will explain why there is a difference between the observed energy of a satellite and the theoretically calculated energy of a satellite, which is orbiting around the Earth. This research will argue regarding whether dark matter is responsible for differences in observed and theoretical speed of stars revolving around the center of Galaxies.

scholarly journals Recent Developments in Quantum Vacuum Energy for Confined Fields

2005 ◽  
Vol 20 (19) ◽  
pp. 4628-4637 ◽  
Author(s):  
K. A. MILTON
Keyword(s):  
Vacuum Energy ◽  
Ad Hoc ◽  
Energy Parameter ◽  
Zero Point ◽  
Quantum Vacuum ◽  
Zero Point Energy ◽  
Point Energy ◽  
New Developments ◽  
Hadronic Physics ◽  
Recent Developments

Quantum vacuum energy entered hadronic physics through the zero-point energy parameter introduced into the bag model. Estimates of this parameter led to apparent discordance with phenomenological fits. More serious were divergences which were omitted in an ad hoc manner. New developments in understanding Casimir self-stresses, and the nature of surface divergences, promise to render the situation clearcut.

scholarly journals QUANTUM VACUUM AND ANOMALIES

1995 ◽  
Vol 10 (17) ◽  
pp. 2579-2588 ◽  
Author(s):  
NORIYUKI FUMITA
Keyword(s):  
Vacuum Energy ◽  
Hamiltonian Formalism ◽  
Zero Point ◽  
Matter Field ◽  
Ghost Number ◽  
Conformal Anomaly ◽  
Quantum Vacuum ◽  
Fermionic Field ◽  
Energy Cutoff ◽  
Dirac Sea

Chiral, conformal and ghost number anomalies are discussed from the viewpoint of the quantum vacuum in Hamiltonian formalism. After introducing the energy cutoff, we derive known anomalies in a new way. We give an interpretation of the anomalies in connection with the zero-point fluctuation of bosonic or fermionic field. We first point out that the chiral U(1) anomaly is understood as the creation of the chirality at the bottom of the regularized Dirac sea in classical electromagnetic field. In the study of the (1+1)-dimensional quantum vacuum of matter field coupled to the gravity, we give a physically intuitive picture of the conformal anomaly. The central charges are evaluated from the vacuum energy. We clarify that the non-Hermitian regularization factor of the vacuum energy is responsible for the ghost number anomaly.

scholarly journals Thermal Casimir effect with general boundary conditions

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
J. M. Muñoz-Castañeda ◽  
L. Santamaría-Sanz ◽  
M. Donaire ◽  
M. Tello-Fraile
Keyword(s):  
Boundary Conditions ◽  
Vacuum Energy ◽  
Casimir Effect ◽  
Quantum Field ◽  
Quantum Vacuum ◽  
Parallel Plates ◽  
Casimir Forces ◽  
Thermal Correction ◽  
Frequency Independent ◽  
Scalar Quantum

Abstract In this paper we study the system of a scalar quantum field confined between two plane, isotropic, and homogeneous parallel plates at thermal equilibrium. We represent the plates by the most general lossless and frequency-independent boundary conditions that satisfy the conditions of isotropy and homogeneity and are compatible with the unitarity of the quantum field theory. Under these conditions we compute the thermal correction to the quantum vacuum energy as a function of the temperature and the parameters encoding the boundary condition. The latter enables us to obtain similar results for the pressure between plates and the quantum thermal correction to the entropy. We find out that our system is thermodynamically stable for any boundary conditions, and we identify a critical temperature below which certain boundary conditions yield attractive, repulsive, and null Casimir forces.

ONE-LOOP VACUUM ENERGY AT THE TACHYON VACUUM

2013 ◽  
Vol 21 ◽  
pp. 157-158
Author(s):  
SHOKO INATOMI
Keyword(s):  
Field Theory ◽  
Quantum Theory ◽  
String Field Theory ◽  
Vacuum Energy ◽  
Open String ◽  
Brst Operator ◽  
Identity Based ◽  
Homotopy Operators

We consider one-loop vacuum energy at the tachyon vacuum in cubic bosonic open string field theory. The BRST operator Ql in the theory around an identity-based solution is believed to represent a kinetic operator at the tachyon vacuum. Using homotopy operators for Ql, we find that one-loop vacuum energy at the tachyon vacuum is independent of moduli such as interbrane distances. This result can be interpreted as support for the annihilation of D-branes at the tachyon vacuum even in the quantum theory.

scholarly journals Brownian motion and polarized three-dimensional quantum vacuum

2021 ◽  
Vol 67 (4 Jul-Aug) ◽  
Author(s):  
Davide Fiscaletti
Keyword(s):  
Dark Matter ◽  
Brownian Motion ◽  
Energy Density ◽  
Nonlinear Model ◽  
Vacuum Energy ◽  
Three Dimensional ◽  
Vacuum Energy Density ◽  
Quantum Vacuum ◽  
Virtual Particles ◽  
Fundamental Entity

A nonlinear model of Brownian motion is developed in a three-dimensional quantum vacuum defined by a variable quantum vacuum energy density corresponding to processes of creation/annihilation of virtual particles. In this model, the polarization of the quantum vacuum determined by a perturbative fluctuation of the quantum vacuum energy density associated with a fluctuating viscosity, which mimics the action of dark matter, emerges as the fundamental entity which generates the Brownian motion.

scholarly journals A NOTE ON THE CASIMIR ENERGY OF A MASSIVE SCALAR FIELD IN POSITIVE CURVATURE SPACE

2004 ◽  
Vol 19 (02) ◽  
pp. 111-116 ◽  
Author(s):  
E. ELIZALDE ◽  
A. C. TORT
Keyword(s):  
High Temperature ◽  
Scalar Field ◽  
Zeta Function ◽  
Vacuum Energy ◽  
Positive Curvature ◽  
Zero Point ◽  
Casimir Energy ◽  
Massive Scalar ◽  
Zero Temperature ◽  
Massive Scalar Field

We re-evaluate the zero point Casimir energy for the case of a massive scalar field in R1×S3 space, allowing also for deviations from the standard conformal value ξ=1/6, by means of zero temperature zeta function techniques. We show that for the problem at hand this approach is equivalent to the high temperature regularization of the vacuum energy, as conjectured in a previous publication. The analytic continuation can be performed in two ways, which are seen to be equivalent.

Quantum vacuum energy and the masslessness of the photon

1981 ◽  
Vol 98 (4) ◽  
pp. 274-276 ◽  
Author(s):  
P.C.W. Davies ◽  
S.D. Unwin
Keyword(s):  
Vacuum Energy ◽  
Quantum Vacuum
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