Origin and escalation of mass-energy equation E=mc^2 Ajay Sharma Community Science Centre. DOE. Post Box 107 Shimla 171001 HP INDIA Email email@example.com , firstname.lastname@example.org Einstein’s 27 Sep 1905 paper available at http://www.fourmilab.ch/etexts/einstein/E_mc2/www/ Abstract E=mc^2existed before Einstein’s derivation in Sep. 1905. Isaac Newton, S. Tolver Preston, Poincaré , De Pretto and F. Hasenöhrl are the philosophers and physicists who have given idea of E=mc^2. Einstein derived existing E=mc^2starting with result of relativistic variation of light energy, but finally obtained L =mc^2 under applying classical conditions (v<<c). After Einstein, Max Plank also derived the same independently. Max Born has expressed surprise over non-inclusion of previous references by Einstein in the derivation of E=mc^2. 1.0 Contributors of equation E =mc2 Before Einstein, among other physicists, Isaac Newton , English S. T. Preston  in 1875, French Poincaré [3,4] in 1900, Italian De Pretto  in 1903, German F. Hasenöhrl [6,7] made significant contributions in speculations and derivations of E=mc^2. After Einstein Planck  has also derived E=mc^2 independently. J J Thomson in 1888 is also believed to have anticipated E=mc^2from Maxwell’s equations. (i) Issac Newton (1642-1727) The Great Sir Isaac Newton  has quoted "Gross bodies and light are convertible into one another...", 1704). In 1704 Newton wrote the book “Optiks”. Newton also put forth Corpuscular Theory of Light (ii) S. Tolver Preston S. Tolver Preston , who made predictions which are based essentially upon E=mc^2. Preston in his book Physics of the Ether proposed in 1875 that vast amount of energy can be produced from matter. Preston determined that one grain could lift a 100,000-ton object up to a height of 1.9 miles. This deduction yields the essence of equation E=mc^2. (iii) Jules Henri Poincaré (1854-1912) Poincaré in 1900 [3,4] put forth an expression for what he called the "momentum of radiation" M_R. It is M_R = S/c^2, where S represents the flux of radiation and c is the usual velocity of light. Poincaré applied the calculation in a recoil process and reached at the conclusion in the form mv = (E/c^2)c. From the viewpoint of unit analysis, E/c^2 takes on the role of a "mass" number associated with radiation. It yields E=mc^2. (vi) Olinto De Pretto An Italian Industrialist Olinto De Pretto  suggested E=mc^2, in concrete way. Firstly this article was published on June 16, 1903. Second time on February 27, 1904 the same was published in the Atti of the Reale Instituto Veneto di Scienze. Thus De Pretto published E=mc^2 about one and half year before. In 1921 De Pretto was shot dead by a woman over a business dispute. When De Pretto was killed he was trying to publish the complete book of his scientific ideas. This paper is in Italian; hence it remained away from accessibility of wider scientific community. However Einstein was affluent in Italian language also. (v) F. Hasenöhrl In 1904 F. Hasenöhrl [6,7 ], gave first derived expression for mass-energy conversion. He investigated a system composed of a hollow enclosure filled with "heat" radiations and wanted to determine the effect of pressure due to radiations. His calculations lead him to conclude that "to the mechanical mass of our system must be added an apparent mass which is given by m = (8/3)E/c^2" where E is the energy of the radiation. Further in later paper he maintained that improve result for mass exchanged is m = (4/3)E/ c^2" Ebenezer Cunningham  in 1914 in his book The Principles of Relativity showed that F. Hasenöhrl, has made a slight error in his calculations. F. Hasenöhrl, did not take characteristics of the shell properly. If errors are removed then m (mass exchanged) = E/c^2 or E = (mass exchanged) c^2 This is the same result as quoted by Einstein. It implies that E=mc^2 is contained in F. Hasenöhrl’s, analysis. Moreover Hasenöhrl’s work was published in the same journal in which Einstein’s method to derive E=mc^2 was published one year later. (vi) Albert Einstein In 1905, Einstein  derived L = mc^2, and then speculated from here E=mc^2, analogously without actual proof. Einstein derived already existing E=mc^2, strangely did not acknowledge his predecessors like de Pretto and Hasenöhrl. Both have suggested E=mc^2 just one and half year before Einstein’s derivation. However two years after i.e. 1907 when Max Plank  derived E=mc^2 independently, Planck acknowledged derivation of Einstein. Planck even pointed out the conceptual and mathematical limitations of Einstein’s method of derivation.. (a) Although Einstein started to derive E=mc^2 using relativistic variation of light energy as in Eq.(2), yet he derived final results under classical condition. Einstein interpreted the results using Binomial Theorem which is applicable if v<<c. (b) Einstein never considered the any Relativistic Increase in Mass of body. ThE equation of Relativistic Increase In Mass was first justified by Kaufman  in 1900. Further Einstein speculated E=mc^2 for all energies from E=mc^2 without justifying that eq.(2) i.e. holds good for sound, heat, chemical , electrical energy etc. If eq.(2) holds good for sound and heat energies, then E=mc^2 will be analogously transformed as Sound energy = E=mc^2 (3) or Every type of energy = E=mc^2 (4) (vii) Max Planck In 1907, Planck  made an in-depth investigation of the energy "confined" within a body, but he did not use Einstein approach at all. Plank presented his findings in Planck derived an expression m-M= E/c2 and interpreted that ” The inertia mass of body is altered by absorption or emission of heat energy. The increments of mass of body are equal to heat energy divided by square of speed of light” Then in a footnote at page 566 Planck writes, "Einstein has already drawn essentially the same conclusions”. Planck maintained Einstein derivation as approximation. (ix) Recent developments. In 1907 Planck  even pointed out the conceptual and mathematical limitations of Einstein’s derivation. In 1952, H E Ives  stressed that Einstein’s derivation of the formula E=mc^2 is fatally flawed because Einstein set out to prove what he assumed. Sharma  in 2003 extended E=mc^2 to E =Ac^2m, where A is conversion co-efficient and can be equal, less or more than one, depending upon inherent characteristics of conversions process in nature. The value of A is consistent with concept of proportionality factor existing since centuries. Energy emitted in celestial events Gamma Ray Bursts (most energetic events after Big Bang) is 10^ 45 Joule/s. It can be explained with value of A equal to 2.57x10^18. Similar is the case of Quasars. Like wise kinetic energy of the fission Fragments of U^235 or Pu^239 is found 20-60 MeV less than Q-value ( 200MeV), Bakhoum  The similar deviations in experimental results are also quoted by Hambsch , Thiereus  etc. It can be explained with value of A less than one. Till date E=mc^2 is not confirmed in chemical reaction due to technical reasons, but regarded as true. Also a particle Ds (2317) discovered at SLAC  has been found to have mass lower than current estimates based upon E=mc^2. Incidentally, there are proposals for both theoretical and experimental variations (increase or decrease) in value of c [18-19]; as fine structure constant is reported to be increasing over cosmological timescales, implying slowing down of speed of light, c. The proposals for variations of speed of light definitely affect status of E =mc2, indirectly. 2.0 Einstein and priority of E=mc^2 Einstein did not mention Hasenöhrl’s work (who gave first derived expression for mass-energy equation) in any of his paper on this subject from 1900 - 1909. However Hasenöhrl has published in 1904 the paper in the same very journal in which Einstein later published his derivation of E=mc^2 in 1905. Einstein  applied his E=mc^2 derivation in 1906. In this paper he gave reference of Poincaré' s work [3, 4]. Einstein gave credit to Poincaré for mass energy equivalence at least for electromagnetic radiations. But, even with Planck's complete derivation and this Poincaré acknowledgement, Einstein later refused to accept any other priority for this notion. Stark  stated that Planck gave first derivation of E=mc^2, in fact Planck and Stark were convinced that Einstein derivation of E=mc^2 is inconsistent. Then Einstein  wrote Stark on 17 Feb 1908, “I was rather disturbed that you do not acknowledge my priority with regard to the connection between inertial mass and energy.” Max Born , co-originator of Quantum Mechanics stated, "The striking point is that it contains not a single reference to previous literature”. Einstein  in 1907 spelled out his views on plagiarism: "It appears to me that it is the nature of the business that what follows has already been partly solved by other authors. Despite that fact, since the issues of concern are here addressed from a new point of view, I am entitled to leave out a thoroughly pedantic survey of the literature..."