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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midot
Shofar and String Theory: Unfolding the Folded Dimensions
I. Introduction Every year on Rosh HaShanah, the raw, unarticulated cry of the shofar cuts through silence. For Kabbalah, that cry is not mere ritual
September 22, 2025 / 29 Elul 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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The Symbolism of the Menorah
The Temple Menorah served as a lighthouse, illuminating darkness and providing purpose and direction.
June 23, 2024 / 17 Sivan 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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Metaphysics of Time in the Eyes of Philosophy and Kabbalah
A-Series and B-Series as Zman and Seder HaZmanim McTaggart’s series A and series B are two conceptual frameworks proposed by the philosopher J.M.E. McTaggart[1] to
July 21, 2023 / 3 Av 5783
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Creation—Destruction—Reconstruction
Structurally identical biblical accounts of creation, destruction, and restoration are viewed as a manifestation of dialectic triad thesis-antithesis-synthesis.
November 11, 2022 / 17 Heshvan 5783
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What is a Soul? III. The Many Souls of Man
…[H]e who tries to cure the soul, wishing to improve the moral qualities, must have a knowledge of the soul in its totality and
December 15, 2021 / 11 Tevet 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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Counting Weeks and Days
There is a Biblical Commandment to count the days between the Passover and Shavuot, the “Feast of Weeks” (a.k.a. Pentecost). We start counting on the
April 28, 2020 / 4 Iyyar 5780
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In the Beginning — It’s All About Change
In the beginning G‑d created the heaven and the earth. (Genesis 1:1) The first verse in the Torah is key to understanding the fundamentals
March 11, 2020 / 15 Adar 5780
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Sukkot — Bringing Time into Space
Jews have a very strange custom to take four species (Heb. arba’a minim)—a fruit of a citron tree (etrog), a branch of a date palm (lulav), boughs from the myrtle tree (chadassim),
October 18, 2019 / 19 Tishri 5780
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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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Three-and-a-half Hakafot — Topology of Simchat Torah
Why is this night different from all other nights, asks a child on the Seder night. On this Simchat Torah I asked a different question—why
October 15, 2017 / 25 Tishri 5778
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Chayei Sarah – where Kabbalah meets physics
And these are the years of the life of Ishmael: one hundred years and thirty years and seven years (Gen. 25,17) You might say the
November 27, 2016 / 26 Heshvan 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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Forty Two Journeys to the Answer to the Ultimate Question of Life, the Universe, and Everything
These are the journeys of the children of Israel… (Numbers 33:1) When G-d brought the Jews out from Egypt, He brought them out with the mystery of
July 27, 2014 / 29 Tammuz 5774
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Menorah
Speak unto Aaron, and say unto him: “When thou lightest the lamps, the seven lamps shall give light in front of the menorah.” (Num. 8:1)
June 8, 2014 / 10 Sivan 5774
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Four Cups and Three Matzoth
On Seder night we drink four cups of wine and eat three matzoth. Why four cups and not three? Why three matzoth and not four?
April 20, 2014 / 20 Nisan 5774
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Mezuzah and Time
Bo: Exodus 10:1 – 14:16 The Erev Shabbat parshat Bo (the Eve of Sabbath of the week when we read the Torah section Bo) 2014
January 5, 2014 / 4 Shevat 5774
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It’s the Time, Stupid!
There is a continuous thread about the mastery of time that weaves through the last chapters of the book of Genesis (Bereshit) and continues through
December 31, 2013 / 28 Tevet 5774
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Cosmological Rosh HaShanah
This Rosh HaShanah I had the strangest dream. I dreamed that I was giving a lecture in cosmology at a university when I suddenly realized
September 9, 2013 / 5 Tishri 5774
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