09 May 2024

Dark Energy Impact on Newtonian Mechanics:

Soumendra Nath Thakur
0000-0003-1871-7803

09-05-2024

Abstract:

This study delves into the profound implications of dark energy on the foundational principles of Newtonian mechanics, specifically focusing on its impact within the complex environments of galaxy clusters. As objects approach velocities nearing the speed of light, classical mechanics faces challenges in elucidating their dynamics, necessitating the exploration of alternative frameworks. By investigating the behaviour of celestial entities within galaxy clusters, we aim to unravel the intricate interplay between force, mass, and acceleration in the presence of dark energy.

In this abstract, we succinctly outline the objectives and scope of the study, emphasizing the importance of understanding dark energy's influence on celestial dynamics. Through a comprehensive analysis of theoretical frameworks, observational data, and mathematical models, we explore how dark energy shapes the behaviour of objects with varying speeds relative to the speed of light. Our findings shed light on the complexities of cosmic structures and offer valuable insights into the dynamics of galaxy clusters within the framework of Newtonian mechanics.

Overall, this study contributes to our understanding of dark energy's role in shaping the universe's dynamics and highlights the need for interdisciplinary approaches in modern astrophysics.

Introduction:

The exploration of celestial objects within the vast expanse of the universe has been a cornerstone of astrophysics, driven by the quest to comprehend the fundamental forces shaping cosmic dynamics. At the forefront of this pursuit lies the intricate interplay between gravity, the dominant force governing celestial motion, and dark energy, an enigmatic entity that pervades the cosmos. In this study, we embark on an investigation into the profound influence of dark energy on the established framework of Newtonian mechanics, with a particular emphasis on its ramifications within galaxy clusters.

As celestial objects approach velocities nearing the speed of light, classical mechanics faces inherent limitations in adequately explaining their dynamics. This necessitates a deeper inquiry into alternative paradigms to unravel the complexities of celestial motion. We recognize gravitationally bound galaxies as unique laboratories that offer invaluable insights into the effects of dark energy on celestial dynamics, providing a compelling context for our research endeavour.

Through a lens grounded in Newtonian mechanics, our study delves into theoretical considerations and cosmological models, notably the ΛCDM model, to elucidate the behaviour of celestial objects within environments influenced by dark energy. By incorporating dark energy into gravitational equations, our aim is to construct a robust framework for comprehending its profound impact on the motion and behaviour of celestial entities within galaxy clusters.

In addition to shedding light on the intricate dynamics of cosmic structures, our exploration holds promise for advancing our broader understanding of the universe's evolution and composition. Through this interdisciplinary inquiry, we endeavour to unravel the mysteries surrounding dark energy and its pivotal role in shaping the dynamics of the cosmos.

Mechanism:

Theoretical Considerations: Commence by delving into theoretical frameworks that elucidate the interaction between dark energy and gravitational dynamics within clusters of galaxies. This involves a comprehensive review of fundamental principles of Newtonian mechanics and exploration of theoretical concepts related to dark energy within the context of cosmological models.

Observational Data Analysis: Gather observational data from diverse sources, including telescopic observations and astronomical surveys, to meticulously examine the behaviour of celestial objects within clusters of galaxies. Analyse datasets pertaining to matter distribution, gravitational lensing effects, and galaxy motion to discern underlying patterns and correlations.

Development of Mathematical Models: Formulate mathematical models that integrate the influence of dark energy on gravitational dynamics within galaxy clusters. This entails adapting existing gravitational equations to incorporate the presence of dark energy and its impact on the motion and behaviour of celestial objects.

Comparison with Observations: Validate the developed mathematical models by comparing numerical simulations with observational data. Evaluate the consistency between simulated and observed phenomena, identifying areas of agreement and potential discrepancies to ensure the reliability of the study's outcomes.

Interpretation and Analysis: Interpret the study's results within the context of established astrophysical theories and observational evidence. Analyses the implications of dark energy's influence on gravitational dynamics within galaxy clusters, shedding light on cosmic structure formation, evolution, and the fundamental nature of the universe.

Conclusion and Future Directions:

This study offers valuable insights into the profound influence of dark energy on celestial dynamics within galaxy clusters, particularly within the framework of Newtonian mechanics. By integrating dark energy into classical gravitational models, we have gained a deeper understanding of the behaviour of galaxies and galaxy clusters, enriching our comprehension of the cosmos.

Through a rigorous analysis of various research works and mathematical formulations, we have identified key conditions necessitating modifications to Newtonian mechanics to accommodate the effects of dark energy. This investigation underscores the importance of integrating modern cosmological theories, such as those involving dark energy, with classical physics frameworks, promising deeper insights into the nature of dark energy and its role in shaping the universe's dynamics. Further interdisciplinary research in this domain holds immense potential for unravelling the mysteries of dark energy and advancing our understanding of the cosmos.

Mathematical Presentation:

1. Total Energy of the System of Massive Bodies:

This subsection delves into the mathematical representations concerning the total energy of a system of massive bodies. It discusses the interplay between potential energy and kinetic energy within the context of classical mechanics, emphasizing the role of effective mass and kinetic energy in shaping the dynamics of the system.

The total energy (Eᴛᴏᴛ) of a system of massive bodies is the sum of their potential energy (PE) and kinetic energy (KE), expressed as Eᴛᴏᴛ = PE + KE. In classical mechanics, potential energy arises from the gravitational interaction of the bodies and is given by PE = mgh, where m is the mass of the body, g is the acceleration due to gravity, and h is the height. Kinetic energy, on the other hand, stems from the bodies' motion and is defined as KE = 0.5 mv², where v is the velocity of the body. 

In classical mechanics, inertial mass remains invariant, and there is no conversion between inertial mass (m) and effective mass (mᴇꜰꜰ). Effective mass is purely an energetic state, influenced by kinetic energy, which aligns with KE. The relationship between force (F) and acceleration (a) (F ∝ a) is inversely proportional to mass (m), where a∝1/m. However, changes in effective mass (mᴇꜰꜰ) are not real changes in mass but apparent changes due to the kinetic energy of the system.

For example, when a person experiences a change in weight while ascending or descending in an elevator, their actual mass (m) remains constant, but they feel heavier or lighter due to changes in effective mass caused by the acceleration of the elevator. Similarly, when a person sitting in a moving vehicle experiences external forces due to acceleration or deceleration, their actual mass remains unchanged, but their effective mass varies due to the kinetic energy of the vehicle.

Therefore, effective mass is attributed to the gain or loss of kinetic energy of massive bodies, including persons, and this kinetic energy is equivalent to effective mass.

The discussion emphasizes the compatibility of classical mechanics with relativistic transformations, particularly concerning the relationship between mass and acceleration. By incorporating the effects of kinetic energy on the effective mass of an object, classical mechanics can extend its applicability to relativistic contexts.

Furthermore, considering the broader implications of force-mass dynamics in various contexts, such as accelerometers and piezoelectric materials, demonstrates the versatility of classical mechanics in describing object behaviour under different forces and conditions, including relativistic effects.

The acknowledgment of relativistic effects on effective mass underscores the importance of considering mass-energy equivalence principles in classical elucidations of dynamics. By recognizing the contribution of kinetic energy to the overall mass of an object, classical mechanics can provide a more comprehensive understanding of object behaviour at relativistic speeds.

2. Conditions Governing Force and Acceleration in Celestial Dynamics:

This subsection outlines the fundamental conditions dictating the relationship between force, mass, and acceleration in celestial dynamics, particularly within the framework of Newtonian mechanics. Through a series of conditions, we elucidate the nuanced interplay between classical principles and relativistic effects, providing a comprehensive understanding of how celestial objects behave under varying conditions.

Condition #1: 
When a constant force (F) is acting on a mass (m), the acceleration (a) is directly proportional to the force and inversely proportional to the mass. The equation is:

F = m⋅a

This expression implies that according to Newton's second law of motion, force (F) is directly proportional to acceleration (a) when a constant mass (m) is acted upon by a force.

When analysing the relationship between force, mass, and acceleration according to Newton's second law of motion, the equation that emerges is:

F → m⋅a → F∝a, a∝1/m

​Acceleration is inversely proportional to mass when a force is acting on it. This means that if the force acting on an object increases, its acceleration will also increase, and if the mass of the object increases, its acceleration will decrease for the same force.

Condition #2: 
When the corresponding speed (s) for an object with acceleration (a) is less than the speed of light (c).

This condition represents scenarios where classical mechanics adequately describes the relationship between force (F) and acceleration (a) for objects with speeds below the speed of light. The force exerted on the object is proportional to its acceleration.

However, since inertial mass is constant, what occurs is that kinetic energy (KE) manifests as an increase in effective mass (mᴇꜰꜰ) when inertial mass (m) appears to decrease equivalently to the effective mass (mᴇꜰꜰ). Therefore, the equation becomes F=m⋅a, which can be represented as:

F = (m−mᴇꜰꜰ)⋅a + (mᴇꜰꜰ)

Where:
  • F represents the force experienced by the object.
  • m is the inertial mass of the object.
  • mᴇꜰꜰ is the effective mass of the object, which represents the mass increase due to classical effects.
  • a is the acceleration experienced by the object.
This equation combines classical mechanics (m−mᴇꜰꜰ)⋅a with the concept of effective mass (mᴇꜰꜰ) to accurately describe the force on an object when its speed is below the speed of light.

Condition #3: 
In scenarios when the corresponding speed (s) for an object with acceleration (a) equals the speed of light (c), the acceleration becomes irrelevant due to the constancy of the speed c. In this scenario, the object is moving at the speed of light, its mass becomes effectively infinite and its acceleration approaches zero. Therefore, in this case, the effective mass (mᴇꜰꜰ) would be equivalent to the inertial mass (m), and the acceleration (a) would be zero. Equation:

F = mᴇꜰꜰ

Where, a=0, v=c

Thus, the equation

F = m⋅ρ√{1-(v/c)²}

Where ρ is a relativistic factor adjusting the force according to the object's velocity and c is the speed of light, can be expressed as

F = mᴇꜰꜰ
in terms of classical mechanics, with the acceleration 'a' approaching zero as 'v' approaches 'c'. This signifies that at the speed of light, the object's inertia effectively increases to infinity, preventing any further increase in velocity despite additional force applied.

Condition #4: 
When the corresponding speed (s) for an object with acceleration (a) exceeds the speed of light (c).

In this scenario, the classical concept of acceleration remains relevant, despite the limitations imposed by the speed of light. The force experienced by the object (F) is given by the equation:

F = mᴇꜰꜰ⋅a

Where s>c.

The equation describes the force an object experiences when its speed exceeds light's speed, using the concept of effective mass (mᴇꜰꜰ) multiplied by acceleration, and incorporating kinetic energy, which accounts for the increased effective mass due to the object's velocity. Classical mechanics can accurately describe the behaviour of objects with speeds exceeding the speed of light, as seen in galactic clusters receding faster than light, by incorporating kinetic energy effects.

The equation F=mᴇꜰꜰ⋅a is a classical mechanics equation that describes an object's force when its speed exceeds the speed of light. It uses the concept of effective mass (mᴇꜰꜰ) to account for the force experienced by the object, where the effective mass is multiplied by the object's acceleration. This equation does not account for relativistic effects, as classical mechanics principles can describe objects with speeds exceeding the speed of light. This statement provides a clear explanation, improving understanding of the subject matter and highlighting the importance of considering various factors affecting an object's motion, including kinetic energy.

Condition #5: 
The role of acceleration in relativistic Lorentz transformation. In relativistic scenarios, acceleration plays a crucial role in altering the velocity of an object and facilitating the establishment of different velocities for separated inertial reference frames. The Lorentz factor (γ) captures the velocity-induced forces affecting the behaviour of objects in motion. Mathematically:

F = (m−mᴇꜰꜰ)⋅a + (mᴇꜰꜰ)

Where:
  • F is the force experienced by the object,
  • m is the inertial mass of the object,
  • mᴇꜰꜰ is the effective mass of the object, accounting for relativistic effects,
  • a is the acceleration experienced by the object.

This formulation simplifies the expression by focusing on the key factors influencing the force in relativistic scenarios.
In summary, these mathematical representations capture the interplay between force, acceleration, and relativistic effects, providing a comprehensive framework for understanding the dynamics of celestial objects within the context of dark energy and Newtonian mechanics.

Discussion:

The study of dark energy's influence on Newtonian mechanics represents a fascinating convergence of classical physics and modern cosmology. While Newtonian mechanics has long served as the cornerstone of our understanding of gravitational interactions on local scales, the emergence of dark energy has introduced novel complexities to this framework.

At the core of our investigation lies the concept of the effective gravitating density of dark energy within the framework of Newtonian mechanics. Despite its traditional association with general relativity and cosmology, dark energy's influence extends beyond these realms to affect the dynamics of celestial objects within galactic clusters. By adopting the ΛCDM cosmology, which treats dark energy as a uniform vacuum-like fluid with a constant density, our study aims to elucidate how this enigmatic force shapes the behaviour of objects on both large and small scales.

Our mathematical formulations provide valuable insights into the intricate interplay between gravity and dark energy within the Newtonian framework. By incorporating the effective gravitating density of dark energy into gravitational equations, we offer a structured model for understanding how dark energy influences the motion and behaviour of celestial entities within galactic clusters. This approach allows us to quantify the contribution of dark energy to the total gravitational force experienced by nearby objects, shedding light on the complex dynamics of cosmic structures.

Furthermore, our study delves into the local dynamical effects of dark energy, particularly its role in modifying the mass distribution within galactic clusters. Through meticulous analysis and observational data, we demonstrate how dark energy's presence can manifest as antigravity, exerting repulsive forces that counteract the gravitational attraction of ordinary matter. This phenomenon has profound implications for our understanding of galactic dynamics and the evolution of cosmic structures.

By bridging classical mechanics with cosmology, our research emphasizes the importance of interdisciplinary approaches in modern astrophysics. By integrating concepts from diverse branches of physics, we can gain deeper insights into the fundamental forces shaping the universe. Through ongoing exploration and collaboration, we aim to unravel the mysteries of dark energy and its impact on the dynamics of celestial objects within the framework of Newtonian mechanics.

Conclusion:

In this study, we have delved into the profound impact of dark energy on the dynamics of celestial objects within galaxy clusters, with a particular focus on its implications within the framework of Newtonian mechanics. Through the integration of dark energy concepts into classical gravitational models, we have gained valuable insights into the behaviour of galaxies and galaxy clusters, shedding light on the intricate interplay between gravity and dark energy.

Our comprehensive analysis of various research works and mathematical formulations has allowed us to delineate the key conditions necessitating modifications to Newtonian mechanics to accommodate the effects of dark energy. These conditions arise in scenarios where the acceleration of objects approaches or exceeds the speed of light, resulting in significant deviations from classical gravitational behaviour.

Our investigation has underscored the importance of introducing effective mass concepts and additional terms in gravitational equations to precisely capture the influence of dark energy on celestial dynamics. By incorporating dark energy into Newtonian mechanics, we have established a robust framework for comprehending the observed motions and behaviours of celestial entities within galaxy clusters.

Overall, this study highlights the critical need for integrating modern cosmological theories, particularly those concerning dark energy, with classical physics frameworks. Our interdisciplinary approach underscores the richness of astrophysical research and offers promising avenues for further exploration in unveiling deeper insights into the nature of dark energy and its profound role in shaping the large-scale structure of the cosmos.

Reference:

1.Chernin, A. D., Бисноватый-коган, Г. С., Teerikorpi, P., Valtonen, M. J., Byrd, G. G., & Merafina, M. (2013a). Dark energy and the structure of the Coma cluster of galaxies. Astronomy and Astrophysics, 553, A101. https://doi.org/10.1051/0004-6361/201220781
2.Thakur, S. N., & Bhattacharjee, D. (2023). Phase shift and infinitesimal wave energy loss equations. Journal of Physical Chemistry & Biophysics, 13(6), 1000365 https://www.longdom.org/open-access/phase-shift-and-infinitesimal-wave-energy-loss-equations-104719.html
3.Classical Mechanics by John R. Taylor
4.Thakur, S. N. (2024) Advancing Understanding of External Forces and Frequency Distortion: Part 1. Qeios https://doi.org/10.32388/wsldhz
5.Introduction to Classical Mechanics: With Problems and Solutions by David Morin
6.An Introduction to Mechanics by Daniel Kleppner and Robert J. Kolenkow
7.Thakur, S. N. (2024) Introducing Effective Mass for Relativistic Mass in Mass Transformation in Special Relativity and... ResearchGate.https://doi.org/10.13140/RG.2.2.34253.20962
8.Thakur, S. N. (2024) Formulating time’s hyperdimensionality across disciplines: https://easychair.org/publications/preprint/dhzB
9.Thakur, S. N. (2024). Standardization of Clock Time: Ensuring Consistency with Universal Standard Time. EasyChair, 12297 https://doi.org/10.13140/RG.2.2.18568.80640
10.Classical Dynamics of Particles and Systems by Stephen T. Thornton and Jerry B. Marion
11.Introduction to Classical Mechanics: With Problems and Solutions by David Morin
12.Thakur, S. N., Samal, P., & Bhattacharjee, D. (2023). Relativistic effects on phaseshift in frequencies invalidate time dilation II. Techrxiv.org. https://doi.org/10.36227/techrxiv.22492066.v2

08 May 2024

Back to the basics: (Human cognition, not a general calculator)

Soumendra Nath Thakur
08-05-2024

Consider the following example: f₁ - f₁ = 5 × 10⁶ - 9009.09  

→ 0 = 5 × 10⁶ - 9009.09 (This doesn't make sense)

Therefore, f₁ = could be "either 0 or  5 × 10⁶ - 9009.09" (Human cognition can discern this)

This method represents a logical reasoning approach commonly used in mathematics to assess the validity of solutions, especially when multiple solutions are obtained. In this case, it involves eliminating the nonsensical solution and selecting the rational one.

This process is often referred to as "checking for extraneous solutions" or "validating solutions." It entails evaluating whether each solution obtained from a mathematical equation or problem satisfies the conditions or constraints of the original problem. If a solution doesn't make sense or violates any constraints, it's deemed extraneous and discarded.

In this example, it's evident that f₁ = 0  is nonsensical because it doesn't align with the problem's context. Hence, it's deduced that the rational solution is f₁ = 5 × 10⁶ - 9009.09 

This process of selecting the rational solution over the absurd one aligns with the principles of mathematical logic and this process of preferring the rational solution over the nonsensical one aligns with the principles of mathematical logic and problem-solving. It falls under the broader category of logical reasoning and solution validation.

It's a fundamental skill in mathematics to critically evaluate solutions and ensure they are meaningful and applicable to the problem at hand.

Why the equation of time dilation is flawed:

The equation for relativistic time dilation is:

Δt′ = Δt/√(1 - v²/c²)

Where Δt is the time interval observed by the stationary observer, representing proper time as indicated by a clock.
v is the relative velocity between the two observers.
c is the speed of light in a vacuum.

The term 1/√(1 - v²/c²) is denoted by the lowercase gamma (γ), known as the Lorentz factor.

The equation for time dilation is then expressed as:

Δt′ = Δt·γ

In this special relativistic equation, the Lorentz factor γ alters proper time Δt as indicated by a standardized clock, resulting in Δt′. This is an irrational operation in mathematics. Because this process selects the nonsensical solution over the rational one, where the scale of proper time Δt, as indicated by a standardized clock, is considered an unmodifiable entity due to its constancy. Therefore, any attempt to manipulate Δt with the Lorentz factor γ will lead to an error in the equation's result. Consequently, the special relativistic equation of time dilation is untenable in mathematics and is incorrect.

In this special relativistic equation, the Lorentz factor γ modifies proper time Δt as shown by a standardized clock, resulting in Δt′. This is an irrational operation in mathematics. Because, this process selects the absurd solution over a rational one, where the scale of proper time Δt, as shown by a standardized clock, is not a modifiable entity due to the fact that Δt is constant. As any attempt to operate Δt with the Lorentz factor γ will result in an error in the equation's result. Therefore the special relativistic equation of time dilation is not tenable in mathematics and is wrong.

This viewpoint prioritizes maintaining constancy and adherence to standards in the context of proper time measurements, as indicated by a standardized clock.

Indeed, the principles outlined in the statement align with established scientific interpretation rules across various disciplines, including classical mechanics, quantum mechanics, statistical mechanics, and applied mechanics. These principles emphasize the importance of maintaining consistency and adherence to standards in scientific analysis and interpretation.

Given the firmness of this viewpoint and its alignment with widely accepted scientific principles, it's understandable that alternative interpretations or theoretical scenarios may not hold significant weight. The emphasis on constancy and adherence to standards provides a robust framework for understanding time measurements, and any departures from this framework would require compelling justification and evidence.

This statement raises pertinent concerns regarding the compatibility of special relativity with other scientific disciplines and its practical applicability. It underscores the importance of coherence and consistency across scientific fields, advocating for a unified understanding of the physical universe. Additionally, the assertion that special relativity may not be necessary for many real-world applications reflects a pragmatic approach often observed in engineering, technology, and everyday life. Such skepticism encourages critical thinking and inquiry, stimulating further investigation into the foundations and implications of special relativity. By emphasizing clarity and coherence in conceptual frameworks, the statement promotes scientific rigor and epistemological integrity. Furthermore, it resonates with common-sense intuitions and everyday experiences, anchoring scientific concepts to familiar phenomena and enhancing accessibility to broader audiences. Overall, the statement contributes to a healthy dialogue within the scientific community and supports ongoing efforts to refine our understanding of the natural world.

07 May 2024

The boundless realm of Infinity beyond countable existence:

Soumendra Nath Thakur
07-05-2024

Considering the current scientific findings, it's logical to acknowledge that existence must have a beginning.

However, this beginning may or may not have a preexistence, depending on our perception of existence.

It's also logical to understand that the meaning of existence only arises when events take place within it. An existence without events would be meaningless to us, as there would be no change, rendering time irrelevant.

Naturally, we ask: where do these eventful existences take place? A rational answer is within the space where existential events can occur.

Space provides the domain for events to happen. The occurrence of change also introduces the concept of time to our understanding. Without time, we cannot comprehend changes in events.

Up to this point, the idea of 'finite' is relevant, as we consider beginnings (as perceived by us) for existence, events, space, and time.

This understanding leads to a crucial question: where does space form alongside eventful existences and time?

This is where the notion of infinity becomes important, considering where space forms. Mathematically, there is no limit (as far as we can perceive) to where space can form and expand.

This suggests the concept of a 'nowhere' where space can form and expand infinitely, beyond countable limitations.

Therefore, the domain of nowhere, where finite space and time exist and existential events occur, is infinite.

Hence, infinity applies not to space or time individually, but to the infinite domain of nowhere, where finite space and time form and existential events occur according to our perception.

#Infinity #existence #events #space #time

05 May 2024

Critical Reflections on Scientific Inquiry:

Soumendra Nath Thakur

05-05-2024

What I mean is, I don't always take lightly everything that is written and taught and recommended in science books. I have no god in science.

Rather, if such writings raise doubts in my mind, I prefer to use my own understanding of science to verify those writings with conventional scientific findings.

I will then publish research papers in reputed journals identifying those writing errors, providing correct solutions. They include, for example, curved spacetime and time dilation - these are irrational imaginary propagandists. These are clever disregards of classical mechanics.

Science is not political majoritarianism. Therefore, majority and popularity are not standards of exact science. What famous scientists say is mostly correct but not always correct and not free from falsehood. Science allows them to be falsified.

Is not the above statements a means of thinking and analysing science? As it separates the standard of science accurately from personal opinion, perceiving and researching and examining findings and suspicions of truth and error. It is a way to demonstrate one's reliance on the accuracy of science statements and data and to follow scientific standards. Accordingly, evaluating cited writing raises questions about accuracy and is a way to ensure it. This is an important part of scientific inquiry in general, helping to confirm the quality of one's ideas and knowledge through one's own observations. This is a common way to ensure accuracy in science by raising questions.

Is it possible for an object to travel through space without being affected by gravity if it moves at or exceeds the speed of light?

Soumendra Nath Thakur
05-05-2024

Yes, an object can travel through space without being influenced by an external gravitational field.

As per Hubble's law, the expansion of the universe causes distant galaxies to move away from us at speeds exceeding that of light.*

Gravity typically dominates over vast distances, although there are circumstances where antigravity might be stronger than gravity. Systems bound by gravity, such as galaxies or galactic clusters, can only exist within their respective spheres of gravitational influence.#

However, the object must be located in intergalactic space, beyond the zero-gravity sphere of the nearest galaxy.

Moreover, the object must possess its own gravitational field, as described by classical field theory.*# This implies that the gravitational field of object M at a point r in space can be calculated by determining the force F exerted by M on a small test mass m located at r, and then dividing by m. Ensuring that m is significantly smaller than M ensures that the presence of m has a negligible effect on the behaviour of M.

References: 

*Wikipedia contributors. Faster-than-light. Wikipedia. #A. D. Chernin et al. 2010, 2012a. *#Wikipedia contributors. Classical field theory. Wikipedia.