The Covenant of Light: From One to Many
In the aftermath of the Great Flood, God places a rainbow in the sky as an eternal covenant with humanity. Yet this celestial arc is
October 21, 2025 / 29 Tishri 5786
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Sefirot
The Ten Days of Nesira: A Mystical Journey of Separation and Union
By Alexander Poltorak לע”נ אבי מורי, אברהם שמשון ע”ה בן ראובן Between the jubilation of Rosh HaShanah and the solemnity of Yom Kippur lie ten
September 28, 2025 / 6 Tishri 5786
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Five-Hundred-Year-Journey
Alexander Poltorak Abstract This essay addresses the anigmatic statement of the Jewish Sages, stating that G-d created this world with the letter Heh and the
August 11, 2025 / 17 Av 5785
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Ten Systems—Ten Sefirot
… mi‑b’sari echezeh Elokah—From my flesh I behold G‑d (Job 19:26) Introduction – “In His Image” The Torah’s initial description of humanity is both profound and enigmatic:
July 22, 2025 / 26 Tammuz 5785
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Shemini,Phase Space,Hamiltonian Mechanics: Kabbalah and Physics of Seven and Eight
By Alexander Poltorak Abstract The Torah portion of Shemini records the climactic eighth day of the Tabernacle’s dedication, the moment when divine fire finally descends.
April 28, 2025 / 30 Nisan 5785
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Sarah in a State of Superposition
And it came to pass, when he was come near to enter into Egypt, that he said unto Sarai his wife: “Behold now, I know
November 10, 2024 / 9 Heshvan 5785
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Bet HaMikdash as a Singularity in Space-time
Introduction In this essay, I intend to draw a parallel between the singularity in space-time, such as the putative point of origin of the universe
August 14, 2024 / 10 Av 5784
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Principle of Least Action III — History
The spectacle of the universe becomes so much the grander, so much more beautiful, the worthier of its Author, when one knows that a small
September 10, 2023 / 24 Elul 5783
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The Standard Model
Introduction What could the Standard Model of particle physics possibly have in common with biblical accounts of the Israelites’ travels in the Sinai Desert, Kabbalistic
May 25, 2023 / 5 Sivan 5783
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Sefirat HaOmer—A Study in Klal u’Prat
The forty-nine days between Passover and Shavuot are called the days of Sefira or the days of counting Omer—Sefirat HaOmer—when Jews count every day as
May 27, 2022 / 26 Iyyar 5782
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What Is a Soul? II. Anatomy of the Soul
In the biblical story of the creation of Adam, the Torah states: Then the Eternal G‑d formed man of the dust of the ground, and
November 5, 2021 / 1 Kislev 5782
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The Cosmological Problem of Initial Conditions and the Universe of Tohu
Now the earth was unformed and void. Genesis 1:2 We have a big problem in cosmology: the problem of the initial conditions of the universe at
September 30, 2021 / 24 Tishri 5782
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Sanctuaries in Space and Time
We are quite familiar with space—we move freely in space back and forth; we concur space on land and beyond; we reclaim land from sea;
March 14, 2021 / 1 Nisan 5781
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Collapse and Revelation
The collapse of the wave function is the process of revealing hidden possibilities. Reducing uncertainty reveals information. Until the wave function collapse, the system is
January 29, 2021 / 16 Shevat 5781
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Egyptian Exile as a Metaphor for Compactification in String Theory
And they made their lives bitter with hard service, in mortar and in brick… Exodus 1:14 On a literal level, the Egyptian exile (Galut Mitzrayim)
January 11, 2021 / 27 Tevet 5781
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Cosmology and the Tetragrammaton
As we discussed in the previous post “Singularity and Paradise,” Paradise offers a beautiful metaphor for modern cosmology wherein Eden is the initial singularity preceding
January 18, 2020 / 21 Tevet 5780
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Singularity and Paradise
These are the chronicles of the heaven and of the earth when they were created, in the day that the Eternal G‑d made earth and
January 16, 2020 / 19 Tevet 5780
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Space – Between the Future and the Past
Meditations on the Maaseh Merkavah – I We do science by studying nature. We study physics in a lab, peering into space or working out
June 13, 2019 / 10 Sivan 5779
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Ten Sephirot and Special Relativity
The Special Theory of Relativity, published by Albert Einstein in 1905, was a game changer. It ushered the era of new physics dubbed by some
June 2, 2019 / 28 Iyyar 5779
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The Beard of the Long Face is Found
The previous Lubavitcher Rebbe, the Rebbe Rayatz (a.k.a. the Fridriker Rebbe) told the story about his father, the Rebbe Rashab. Once the brother of Rebbe
August 31, 2018 / 20 Elul 5778
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Five Worlds
Today, Yud Shvat, is the yartzeit (anniversary of passing) of the sixth Lubavitcher Rebbe, Rabbi Yosef Yitzchak Schneersohn, a.k.a. the Rebbe Rayatz, or the Frierdiker
February 6, 2017 / 10 Shevat 5777
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The Fifth Force
Now, therefore, write ye this song for you, and teach thou it the children of Israel.” (Deut. 31:19) The four known fundamental forces are: gravitational
October 11, 2016 / 9 Tishri 5777
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Fractal Patterns in the Torah
In the Torah portion Emor (Leviticus 21:1–24:23), we are instructed to abstain from work every seventh day on Shabbat. Next week’s Torah portion, Behar, continues
May 31, 2016 / 23 Iyyar 5776
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Joseph and His Brothers
I grew up in Russia and was raised on the metric system based on decimal arithmetic. When we immigrated to the U.S., I had to
December 14, 2014 / 22 Kislev 5775
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